css-blending-test-plan-proposal.html (91810B)
1 <!DOCTYPE html> 2 <html> 3 <head> 4 <title>Compositing and Blending test plan</title> 5 <meta charset='utf-8'> 6 <script src='http://www.w3.org/Tools/respec/respec-w3c-common' 7 async class='remove'></script> 8 <script class='remove'> 9 var respecConfig = { 10 specStatus: "unofficial", 11 shortName: "css3-blending-test-plan", 12 editors: [ 13 { 14 name: "Mirela Budaes", 15 company: "Adobe Systems, Inc.", 16 companyURL: "http://www.adobe.com/" 17 }, 18 { 19 name: "Horia Olaru", 20 company: "Adobe Systems, Inc.", 21 companyURL: "http://www.adobe.com/" 22 }, 23 { 24 name: "Mihai Tica", 25 company: "Adobe Systems, Inc.", 26 companyURL: "http://www.adobe.com/" 27 }, 28 29 ] 30 }; 31 </script> 32 <style> 33 table 34 { 35 border-collapse:collapse; 36 } 37 table, td, th 38 { 39 border:1px solid black; 40 padding: 13px; 41 } 42 table 43 { 44 width: 100%; 45 } 46 img 47 { 48 width: 400px; 49 } 50 </style> 51 </head> 52 <body> 53 <section id='abstract'> 54 <p> 55 This document is intended to be used as a guideline for the testing 56 activities related to the Compositing and Blending spec [[!compositing-1]]. Its main 57 goal is to provide an overview of the general testing areas and an informative 58 description of possible test cases. 59 </p> 60 <p> 61 This document is not meant to replace the spec in determining the 62 normative and non-normative assertions to be tested, but rather 63 complement it. 64 </p> 65 </section> 66 <section> 67 <h2>Goals</h2> 68 <section> 69 <h3>Providing guidance on testing</h3> 70 <p> 71 In order to increase the quality of the test contributions, this 72 document offers a set of test cases description for conducting testing (see 73 <a href="#test-cases-description" class="sectionRef"></a>). 74 </p> 75 </section> 76 <section> 77 <h3>Creating automation-friendly tests</h3> 78 <p> 79 In terms of actual tests produced for the CSS Compositing and Blending, the main goal 80 is to ensure that most tests are automatable (i.e. they're either 81 reftests or use <code>testharness.js</code>). Even where manual tests 82 are absolutely necessary they should be written so that they can be 83 easily automated – as there are on-going efforts to make 84 WebDriver [[webdriver]] automated tests a first class citizen in W3C 85 testing. This means that even if a manual test requires user 86 interaction, the validation or PASS/FAIL conditions should still be 87 clear enough as to allow automatic validation if said interaction is 88 later automated. 89 </p> 90 </section> 91 </section> 92 <section> 93 <h2>Approach</h2> 94 <p> 95 Since CSS blending has only three new CSS properties, 96 the approach is to deep dive into every aspect of the spec as much as possible. 97 98 Tests will be created for the testing areas listed in <a href="#testig-areas" class="sectionRef"></a> 99 and having as guidance the test cases description from <a href="#test-cases-description" class="sectionRef"></a>. 100 </p> 101 </section> 102 <section> 103 <h2>Testing areas</h2> 104 <section> 105 <h3>Explicit testing areas</h3> 106 <p> 107 These testing areas cover things explicitly defined in the normative sections of the Blending and Compositing spec. Please note that while detailed, this list is not necessarily 108 exhaustive and some normative behaviors may not be contained in it. 109 When in doubt, consult the Blending and Compositing spec or ask a question on the 110 <a href="http://lists.w3.org/Archives/Public/www-style/">mailing 111 list</a>. 112 </p> 113 <p>Below is the list of explicit testing areas:</p> 114 <ol> 115 <li>Proper parsing of the CSS properties and rendering according to the spec 116 <ul><code>mix-blend-mode</code></ul> 117 <ul><code>isolation</code></ul> 118 <ul><code>background-blend-mode</code></ul> 119 </li> 120 <li>SVG blending</li> 121 <li>Canvas 2D blending</li> 122 </ol> 123 </section> 124 <section> 125 <h3>Implicit testing areas</h3> 126 <p> 127 These are testing areas either normatively defined in other specs 128 that explicitly refer to the Blending and Compositing spec (e.g. [[!css3-transforms]]) 129 or simply not explicitly defined, but implied by various aspects of 130 the spec (e.g. processing model, CSS 2.1 compliance, etc.). 131 Please note that while detailed, this list is not necessarily 132 exhaustive and some normative behaviors may not be contained in it. 133 When in doubt, consult the Blending and Compositing spec or ask a question on the 134 <a href="http://lists.w3.org/Archives/Public/www-style/">mailing 135 list</a>. 136 </p> 137 <p>Below is the list of implicit testing areas:</p> 138 <ol> 139 <li>Blending different types of elements 140 <ul> 141 <li><code><video></code></li> 142 <li><code><canvas></code></li> 143 <li><code><table></code></li> 144 </ul> 145 </li> 146 <li>Blending elements with specific style rules applied 147 <ul> 148 <li><code>transforms</code></li> 149 <li><code>transitions</code> </li> 150 <li><code>animations</code> </li> 151 </ul> 152 </li> 153 </ol> 154 </section> 155 </section> 156 <section> 157 <h2>Test cases description</h2> 158 <section> 159 <h3>Test cases for <code>mix-blend-mode</code></h3> 160 <p> 161 The following diagram describes a list of notations to be used later on in the document as well as the general document structure the test cases will follow. The test cases should not be limited to this structure. This should be a wireframe and people are encouraged to come up with complex test cases as well. 162 </p> 163 <p> 164 <img id="test_outline" src="test_template.png" alt="Mix-blend-mode sample elements"> 165 </p> 166 <p>The intended structure of the document is the following:</p> 167 <pre> 168 <body> 169 <div id="[P]"> 170 <div id="[IN-S]"></div> 171 <div id="[IN-P]"> 172 <div id="[B]"> 173 <div id="[CB]"></div> 174 </div> 175 </div> 176 </div> 177 </body> 178 </pre> 179 <p> Unless otherwise stated, test cases assume the following properties for the elements: <br> 180 <ul> 181 <li> default value for the <code>background-color</code> of the <code>body</code></li> 182 <li> <code>background-color</code> set to a fully opaque color for all the other elements </li> 183 </ul> 184 </p> 185 <p>The CSS associated to the elements used in the tests shouldn't use properties that creates a stacking context, except the ones specified in the test case descriptions.</p> 186 <p>Every test case has a description of the elements used. The notation from the image is used in the test case description too (e.g. for parent element the notation is [P]). Each test case uses only a subset of the elements while the other elements should just be removed. 187 </p></p> 188 <section> 189 <h4>An element with <code>mix-blend-mode</code> other than normal creates a stacking context</h4> 190 <p>Refers to the following assertion in the <a href="https://drafts.fxtf.org/compositing-1/#mix-blend-mode" >spec</a>: <q>Applying a blendmode other than ‘normal’ to the element must establish a new stacking context [CSS21].</q></p> 191 <table> 192 <tr> 193 <th>Test name</th> 194 <th>Elements and styles</th> 195 <th>Expected result</th> 196 </tr> 197 <tr> 198 <td>Simple <code><div></td> 199 <td>1 element required: <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br> 200 [B] - element with <code>mix-blend-mode</code> other than normal 201 </td> 202 <td>The element [B] creates a stacking context</td> 203 </tr> 204 </table> 205 </section> 206 <section> 207 <h4>An element with <code>mix-blend-mode</code> blends with the content within the current stacking context</h4> 208 <p>Refers to the following assertion in the <a href="https://drafts.fxtf.org/compositing-1/#csscompositingrules_CSS">spec</a>: <q>An element that has blending applied, must blend with all the underlying content of the stacking context [CSS21] that that element belongs to.</q> </p> 209 <table> 210 <tr> 211 <th>Test name</th> 212 <th>Elements and styles</th> 213 <th>Expected result</th> 214 </tr> 215 <tr> 216 <td>Blending simple elements </td> 217 <td>2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br> 218 [P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br> 219 [B] - element with <code>mix-blend-mode</code> other than normal 220 </td> 221 <td>The color of the parent element [P] mixes with the color of the child element [B].</td> 222 </tr> 223 <tr> 224 <td>Blending <code><video></code></td> 225 <td>2 elements required: <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> and <a href="#test_outline" title="Sibling of the element [B]">[IN-S]</a> <br> 226 [B] - <code><video></code> element with <code>mix-blend-mode</code> other than normal <br> 227 [IN-S] - sibling(of the element [B]) visually overlaping the <code><video></code> element <br> 228 [IN-S] has some text inside 229 </td> 230 <td>The content of the <code>video</code> element [B] mixes with the colors of the sibling element and the text from [IN-S].</td> 231 </tr> 232 <tr> 233 <td>Blending with a sibling</td> 234 <td>3 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a>, <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> and <a href="#test_outline" title="Sibling of the element [B]">[IN-S]</a> <br> 235 [P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br> 236 [B] - element with <code>mix-blend-mode</code> other than normal <br> 237 [IN-S] - sibling of the element [B] <br> 238 The [IN-S] element visually overlaps the [B] element 239 </td> 240 <td>The colors of the parent element [P] and the sibling element [IN-S] mixes with the color of the blended element [B].</td> 241 </tr> 242 <tr> 243 <td>Blending with two levels of ascendants</td> 244 <td>3 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a>, <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> and <a href="#test_outline" title="child of the element [P]">[IN-P]</a> <br> 245 [P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br> 246 [B] - element with <code>mix-blend-mode</code> other than normal <br> 247 [IN-P] - Intermediate child element between the parent [P] and the child [B] 248 </td> 249 <td>The colors of the parent element [P] and the child element [IN-P] mixes with the color of the blended element [B].</td> 250 </tr> 251 </table> 252 </section> 253 <section> 254 <h4>An element with <code>mix-blend-mode</code> doesn't blend with anything outside the current stacking context</h4> 255 <p>Refers to the following assertion in the <a href="https://drafts.fxtf.org/compositing-1/#csscompositingrules_CSS">spec</a>: <q> An element that has blending applied, must blend with all the underlying content of the stacking context [CSS21] that that element belongs to.</q></p> 256 <table> 257 <tr> 258 <th>Test name</th> 259 <th>Elements and styles</th> 260 <th>Expected result</th> 261 </tr> 262 <tr> 263 <td>Blending child overflows the parent</td> 264 <td>2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br> 265 [P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br> 266 [B] - element with <code>mix-blend-mode</code> other than normal <br> 267 The blending element [B] has content that lies outside the parent element. <br> 268 Set the <code>background-color</code> of the <code>body</code> to a value other than default</td> 269 <td>The color of the parent element mixes with the color of the child element. <br> 270 The area of the child element outside of the parent element doesn't mix with the color of the <code>body</code></td> 271 </tr> 272 <tr> 273 <td>Parent with transparent pixels</td> 274 <td>2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br> 275 [P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br> 276 The element has some text inside and default value for <code>background-color</code> <br> 277 [B] - element with <code>mix-blend-mode</code> other than normal <br> 278 The <code>background-color</code> of the <code>body</code> has a value other than default</td> 279 <td>The color of the text from the parent element [P] mixes with the color of the child element [B]. <br> 280 No blending between the color of the <code>body</code> and the color of the blending element [B]. 281 </td> 282 </tr> 283 <tr> 284 <td>Parent with <code>border-radius</code></td> 285 <td>2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br> 286 [P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br> 287 [P] has <code>border-radius</code> specified (e.g.50%). <br> 288 [B] - element with <code>mix-blend-mode</code> other than normal <br> 289 [B] has content that lies outside the parent element, over a rounded corner. <br> 290 The <code>background-color</code> of the <code>body</code> has a value other than default. </td> 291 <td>The color of the parent element mixes with the color of the child element. <br> 292 The area of the child element which draws over the rounded corner doesn't mix with the color of the <code>body</code></td> 293 </tr> 294 </table> 295 </section> 296 <section> 297 <h4>An element with <code>mix-blend-mode</code> other than normal must cause a group to be isolated</h4> 298 <p>Refers to the following assertion in the <a href="https://drafts.fxtf.org/compositing-1/#isolation" >spec</a>: <q>operations that cause the creation of stacking context [CSS21] must cause a group to be isolated.</q> </p> 299 <table> 300 <tr> 301 <th>Test name</th> 302 <th>Elements and styles</th> 303 <th>Expected result</th> 304 </tr> 305 <tr> 306 <td>Child of the blended element has opacity</td> 307 <td>3 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a>, <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> and <a href="#test_outline" title="Child of the lement [B]">[CB]</a> <br> 308 [P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br> 309 [B] - element with <code>mix-blend-mode</code> other than normal <br> 310 [CB] - child of the element [B] with <code>opacity</code> less than one. </td> 311 <td>The group created by the two child elements([B] and [CB]) is blended with the parent element [P]. <br> 312 No blending between [B] and [CB]</td> 313 </tr> 314 <tr> 315 <td>Overflowed child of the blended element</td> 316 <td>3 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a>, <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> and <a href="#test_outline" title="Child of the lement [B]">[CB]</a> <br> 317 [P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br> 318 [B] - element with <code>mix-blend-mode</code> other than normal <br> 319 [CB] - child of the element [B] with content that lies outside the parent element [B]. 320 </td> 321 <td>The group created by the two child elements([B] and [CB]) is blended with the parent element [P]. <br> 322 No blending between [B] and [CB]. There is only one color for the entire element [CB] </td> 323 </tr> 324 <tr> 325 <td>Blended element with transparent pixels</td> 326 <td>3 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a>, <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> and <a href="#test_outline" title="Child of the lement [B]">[CB]</a> <br> 327 [P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br> 328 [B] - element with <code>mix-blend-mode</code> other than normal and transparent <code>background-color</code> <br> 329 [CB] - child of the element [B] 330 </td> 331 <td>The group created by the two child elements([B] and [CB]) is blended with the parent element [P]. <br> 332 No blending between [B] and [CB]. </td> 333 </tr> 334 </table> 335 </section> 336 <section> 337 <h4>An element with <code>mix-blend-mode</code> must work properly with css transforms</h4> 338 <table> 339 <tr> 340 <th>Test name</th> 341 <th>Elements and styles</th> 342 <th>Expected result</th> 343 </tr> 344 <tr> 345 <td>Parent with 3D transform</td> 346 <td>2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br> 347 [P] - parent element with <code>3D transform</code> <br> 348 [B] - element with <code>mix-blend-mode</code> other than normal 349 <td>The color of the parent element [P] mixes with the color of the child element [B] <br> 350 The element (and the content) of the element [P] is properly transformed 351 </td> 352 </tr> 353 <tr> 354 <td>Blended element with 3D transform</td> 355 <td>2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a>, <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> and <a href="#test_outline" title="Child of the lement [B]">[CB]</a> <br> 356 [P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br> 357 [B] - element with <code>mix-blend-mode</code> other than normal and <code>3D transform</code> <br> 358 [CB] - child of the element [B] </td> 359 <td> The color of the parent element [P] mixes with the color of the child element [B] <br> 360 The element (and the content) of the element [P] is properly transformed </td> 361 </tr> 362 <tr> 363 <td>Both parent and blended element with 3D transform</td> 364 <td> 2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br> 365 [P] - parent element with <code>3D transform</code> <br> 366 [B] - element with <code>mix-blend-mode</code> other than normal and <code>3D transform</code> 367 </td> 368 <td>The color of the parent element [P] mixes with the color of the child element [B] <br> 369 The elements (and the content) of the elements [P] and [B] are properly transformed</td> 370 </tr> 371 <tr> 372 <td>Blended element with transform and preserve-3d</td> 373 <td>3 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a>, <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> and <a href="#test_outline" title="Child of the lement [B]">[CB]</a> <br> 374 [P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br> 375 [B] - element with <code>mix-blend-mode</code> other than normal and transform with <code>transform-style:preserve-3d</code> <br> 376 [CB] - child of the element [B]. It has 3D transform property</td> 377 <td> The child element [CB] will NOT preserve its 3D position. <br> 378 <code>mix-blend-mode</code> override the behavior of <code>transform-style:preserve-3d</code>: 379 creates a flattened representation of the descendant elements <br> 380 The color of the group created by the child elements([B] and [CB]) will blend with the color of the parent element [P] </td> 381 </tr> 382 <tr> 383 <td>Blended element with transform and perspective</td> 384 <td>2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br> 385 [P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br> 386 [B] - element with <code>mix-blend-mode</code> other than normal and transform with <code>perspective</code> set to positive length </td> 387 <td>The colors of the parent and the child are mixed ([P] and [B]) <br> 388 The element (and the content) of the element [B] is properly transformed 389 </td> 390 </tr> 391 <tr> 392 <td>Sibling with 3D transform between the parent and the blended element</td> 393 <td>3 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a>, <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> and <a href="#test_outline" title="Sibling of the element [B]">[IN-S]</a> <br> 394 [P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br> 395 [B] - element with <code>mix-blend-mode</code> other than normal <br> 396 [IN-S] - Sibling(of the element [B]) with <code>3D transform</code> between the parent [P] and the child [B] 397 </td> 398 <td>The colors of the parent element [P] and the transformed sibling element [IN-S] mixes with the color of the blended element [B].<br> 399 The element (and the content) of the element [IN-S] is properly transformed 400 </td> 401 </tr> 402 <tr> 403 <td>Parent with 3D transform and transition</td> 404 <td>2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br> 405 [P] - parent element with <code>3D transform</code> and transition <br> 406 [B] - element with <code>mix-blend-mode</code> other than normal 407 <td>The color of the parent element [P] mixes with the color of the child element [B] <br> 408 The element (and the content) of the element [P] is properly transformed 409 </td> 410 </tr> 411 <tr> 412 <td>Sibling with 3D transform(and transition) between the parent and the blended element</td> 413 <td>3 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a>, <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> and <a href="#test_outline" title="Sibling of the element [B]">[IN-S]</a> <br> 414 [P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br> 415 [B] - element with <code>mix-blend-mode</code> other than normal <br> 416 [IN-S] - sibling(of the element [B]) with <code>3D transform</code> and transition between the parent [P] and the child [B] 417 </td> 418 <td>The colors of the parent element [P] and the transformed sibling element [IN-S] mixes with the color of the blended element [B].<br> 419 The element (and the content) of the element [IN-S] is properly transformed 420 </td> 421 </tr> 422 </table> 423 </section> 424 <section> 425 <h4>An element with <code>mix-blend-mode</code> must work properly with elements with <code>overflow</code> property</h4> 426 <table> 427 <tr> 428 <td>Parent element with <code>overflow:scroll</code> </td> 429 <td>2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br> 430 [P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br> 431 [P] has <code>overflow:scroll</code> <br> 432 [B] - element with <code>mix-blend-mode</code> other than normal tat overflows the parents [P] dimensions so that it creates scrolling for the parent 433 <td>The color of the parent element [P] mixes with the color of the child element [B]. <br> 434 The scrolling mechanism is not affected. 435 </td> 436 </tr> 437 <tr> 438 <td>Blended element with <code>overflow:scroll</code></td> 439 <td>2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br> 440 [P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br> 441 [B] - element with <code>mix-blend-mode</code> other than normal, <code>overflow:scroll</code> and a child element that creates overflow for [B]</td> 442 <td>The color of the parent element [P] mixes with the color of the child element [B] <br> 443 The scrolling mechanism is not affected. 444 </td> 445 </tr> 446 <tr> 447 <td>Parent element with <code>overflow:scroll</code> and blended with <code>position:fixed</code> </td> 448 <td>2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br> 449 [P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br> 450 [P] has <code>overflow:scroll</code> <br> 451 [B] - element with <code>mix-blend-mode</code> other than normal, <code>position:fixed</code> and should overflow the parents [P] dimensions so that it creates scrolling for the parent</td> 452 <td>The color of the parent element [P] mixes with the color of the child element [B] <br> 453 The blending happens when scrolling the content of the parent element [P] too. <br> 454 The scrolling mechanism is not affected. 455 </td> 456 </tr> 457 <tr> 458 <td>Parent with <code>overflow:hidden</code> and <code>border-radius</code></td> 459 <td>2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br> 460 [P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br> 461 [P] has <code>overflow:hidden</code> and <code>border-radius</code> specified (e.g.50%) <br> 462 [B] - element with <code>mix-blend-mode</code> other than normal with content that lies outside the parent element, over a rounded corner <br> 463 Set the <code>background-color</code> of the <code>body</code> to a value other than default.</td> 464 <td>The color of the parent element mixes with the color of the child element. <br> 465 The area of the child element which draws over the rounded corner is properly cut </td> 466 </tr> 467 <tr> 468 <td>Blended element with <code>overflow:hidden</code> and <code>border-radius</code></td> 469 <td>3 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> and <a href="#test_outline" title="Child of the lement [B]">[CB]</a> <br> 470 [P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br> 471 [B] - element with <code>mix-blend-mode</code> other than normal, <code>overflow:hidden</code> and <code>border-radius</code> specified (e.g.50%). <br> 472 [CB] - child of the element [B], with content that lies outside the parent element, over a rounded corner. <br> </td> 473 <td>The group created by the two child elements([B] and [CB]) is blended with the parent element [P]. <br> 474 No blending between [B] and [CB]. <br> 475 [CB] is properly clipped so no overflow is visible.</td> 476 </tr> 477 <tr> 478 <td>Intermediate child with <code>overflow:hidden</code> and <code>border-radius</code> between the parent and the blended element</td> 479 <td>3 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a>, <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> and <a href="#test_outline" title="child of the element [P]">[IN-P]</a> <br> 480 [P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br> 481 [B] - element with <code>mix-blend-mode</code> other than normal that overflows the parents [IN-P] dimensions 482 [IN-P] - child(of the element [P]) with <code>overflow:hidden</code> and <code>border-radius</code> specified (e.g.50%) 483 </td> 484 <td>The colors of the parent element [P] and the child element [IN-P] mixes with the color of the blended element [B]. <br> 485 [B] is is properly clipped so no overflow is visible 486 </td> 487 </tr> 488 </table> 489 </section> 490 <section> 491 <h4>Other test cases</h4> 492 <table> 493 <tr> 494 <th>Test name</th> 495 <th>Elements and styles</th> 496 <th>Expected result</th> 497 </tr> 498 <tr> 499 <td>Blended element with <code>border-image</code> </td> 500 <td>2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br> 501 [P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br> 502 [B] - element with <code>mix-blend-mode</code> other than normal and <code>border-image</code> specified as a png file 503 </td> 504 <td>The color of the parent element [P] mixes with the color of the child element. <br> 505 The color of the <code>border-image</code> mixes with the color of the parent element [P]. 506 </td> 507 </tr> 508 <tr> 509 <td>Blending with <code><canvas></code> </td> 510 <td>2 elements required: <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> and <a href="#test_outline" title="Sibling of the element [B]">[IN-S]</a> <br> 511 [B] - <code><canvas></code> element with <code>mix-blend-mode</code> other than normal <br> 512 [IN-S] - Sibling of the <code><canvas></code> element with some text <br> 513 The [IN-S] element overlaps the <code><canvas></code> element 514 </td> 515 <td>The content of the <code><canvas></code> element mixes with the color of the sibling element and the text [IN-S].</td> 516 </tr> 517 <tr> 518 <td>Blended <code><canvas></code></td> 519 <td>2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br> 520 [P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br> 521 [B] - Child <code><canvas></code> element with <code>mix-blend-mode</code> other than normal 522 </td> 523 <td>The color of the <code><canvas></code> element [B] mixes with the color of the parent element [P] .</td> 524 </tr> 525 <tr> 526 <td>Blended <code><video></code></td> 527 <td>2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br> 528 [P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br> 529 [B] - <code><video></code> element with <code>mix-blend-mode</code> other than normal 530 </td> 531 <td>The color of the <code><video></code> element mixes with the color of the parent element [P] .</td> 532 </tr> 533 <tr> 534 <td>Blending with <code><iframe></code> </td> 535 <td>2 elements required: <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> and <a href="#test_outline" title="Sibling of the element [B]">[IN-S]</a> <br> 536 [B] - <code><iframe></code> element with <code>mix-blend-mode</code> other than normal <br> 537 [IN-S] - sibling(of the element [B]) with some text <br> 538 The [IN-S] element visually overlaps the <code><iframe></code> element 539 </td> 540 <td>The color of the <code><iframe></code> element mixes with the color of the sibling element and the text [IN-S].</td> 541 </tr> 542 <tr> 543 <td>Blended <code><iframe></code></td> 544 <td>2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br> 545 [P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br> 546 [B] - <code><iframe></code> element with <code>mix-blend-mode</code> other than normal 547 </td> 548 <td>The color of the <code><iframe></code> element [B] mixes with the color of the parent element [P]. </td> 549 </tr> 550 <tr> 551 <td>Blended element with <code>mask</code> property</td> 552 <td>2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br> 553 [P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br> 554 [B] - element with <code>mix-blend-mode</code> other than normal and <code>mask</code> property specified to an SVG image (e.g. circle)</td> 555 <td>The colors of the parent and the masked child are mixed ([P] and [B])</td> 556 </tr> 557 <tr> 558 <td>Blended element with <code>clip-path</code> property </td> 559 <td>2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br> 560 [P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br> 561 [B] - element with <code>mix-blend-mode</code> other than normal and <code>clip-path</code> property specified to a basic shape (e.g. ellipse)</td> 562 <td>The colors of the parent and the clipped child are mixed ([P] and [B])</td> 563 </tr> 564 <tr> 565 <td>Blended element with <code>filter</code> property</td> 566 <td>2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br> 567 [P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br> 568 [B] - element with <code>mix-blend-mode</code> other than normal and <code>filter</code> property value other than none </td> 569 <td>The filter is applied and the result is mixed with the parent element</td> 570 </tr> 571 <tr> 572 <td>Blended element with <code>transition</code></td> 573 <td>2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br> 574 [P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br> 575 [B] - element with <code>mix-blend-mode</code> other than normal and <code>transition-property</code> for <code>opacity</code> </td> 576 <td>The transition is applied and the result is mixed with the parent element</td> 577 </tr> 578 <tr> 579 <td>Blended element with <code>animation</code></td> 580 <td>2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br> 581 [P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br> 582 [B] - element with <code>mix-blend-mode</code> other than normal and <code>animation</code> specified</td> 583 <td>The animation is applied to the child element and the result is mixed with the parent element</td> 584 </tr> 585 <tr> 586 <td>Image element</td> 587 <td>2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br> 588 [P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br> 589 [B] - <code><img></code> element (.jpeg or .gif image) with <code>mix-blend-mode</code> other than normal</td> 590 <td>The color of the <code><img></code> is mixed with the color of the <code><div></code>.</td> 591 </tr> 592 <tr> 593 <td>SVG element</td> 594 <td>2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br> 595 [P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br> 596 [B] - SVG element with <code>mix-blend-mode</code> other than normal</td> 597 <td>The color of the SVG is mixed with the color of the <code><div></code>.</td> 598 </tr> 599 <tr> 600 <td>Paragraph element</td> 601 <td>2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br> 602 [P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br> 603 [B] - paragraph element with <code>mix-blend-mode</code> other than normal</td> 604 <td>The color of the text from the paragraph element is mixed with the color of the <code><div></code></td> 605 </tr> 606 <tr> 607 <td>Paragraph element and background-image</td> 608 <td>2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br> 609 [P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br> 610 and <code>background-image</code> <br> 611 [B] - Child <code>p</code> element with some text and <code>mix-blend-mode</code> other than normal</td> 612 <td>The color of the text from the <code>p</code> element is mixed with the background image of the <code><div></code>.</td> 613 </tr> 614 <tr> 615 <td>Set blending from JavaScript</td> 616 <td>2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br> 617 [P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br> 618 [B] - Child <code><div></code> element with no <code>mix-blend-mode</code> specified<br> 619 From JavaScript, set the <code>mix-blend-mode</code> property for the child <code><div></code> to a value other than normal</td> 620 <td>The colors of the <code><div></code> elements are mixed.</td> 621 </tr> 622 </table> 623 </section> 624 </section> 625 <section> 626 <h3>Test cases for SVG elements with <code>mix-blend-mode</code></h4> 627 <section> 628 <h4><code>mix-blend-mode</code> with simple SVG graphical elements</h4> 629 <p>Refers to the following assertion in the <a href="https://drafts.fxtf.org/compositing-1/#mix-blend-mode" >spec</a> : <q><code>mix-blend-mode</code> applies to svg, g, use, image, path, rect, circle, ellipse, line, polyline, polygon, text, tspan, and marker.</q></p> 630 <table> 631 <tr> 632 <th>Test name</th> 633 <th>Elements and styles</th> 634 <th>Expected result</th> 635 </tr> 636 <tr> 637 <td>Circle with SVG background</td> 638 <td>Set a background color for the SVG.<br> 639 Create 16 <code>circle</code> elements and fill them with a solid color. 640 <br>Apply each <code>mix-blend-mode</code> on them.</td> 641 <td>The color of the <code>circle</code> is mixed with the color of the background.</td> 642 </tr> 643 <tr> 644 <td>Ellipse with SVG background</td> 645 <td>Set a background color for the SVG.<br> 646 Create an <code>ellipse</code> element and fill it with a solid color. 647 <br>Apply a <code>mix-blend-mode</code> on it other than <code>normal</code>.</td> 648 <td>The color of the <code>ellipse</code> is mixed with the color of the background.</td> 649 </tr> 650 <tr> 651 <td>Image with SVG background</td> 652 <td>Set a background color for the SVG. 653 <br>Create an <code>image</code> element and apply a <code>mix-blend-mode</code> other than <code>normal</code>.</td> 654 <td>The <code>image</code> is mixed with the color of the background.</td> 655 </tr> 656 <tr> 657 <td>Line with SVG background</td> 658 <td>Set a background color for the SVG. 659 <br>Create a <code>line</code> element and fill it with a solid color. 660 <br>Apply a <code>mix-blend-mode</code> on it other than <code>normal</code>.</td> 661 <td>The color of the <code>line</code> is mixed with the color of the background.</td> 662 </tr> 663 <tr> 664 <td>Path with SVG background</td> 665 <td>Set a background color for the SVG. 666 <br>Create a <code>path</code> element and fill it with a solid color. 667 <br>Apply a <code>mix-blend-mode</code> on it other than <code>normal</code>.</td> 668 <td>The color of the <code>path</code> is mixed with the color of the background.</td> 669 </tr> 670 <tr> 671 <td>Polygon with SVG background</td> 672 <td>Set a background color for the SVG. 673 <br>Create a <code>polygon</code> element and fill it with a solid color. 674 <br>Apply a <code>mix-blend-mode</code> on it other than <code>normal</code>.</td> 675 <td>The color of the <code>polygon</code> is mixed with the color of the background.</td> 676 </tr> 677 <tr> 678 <td>Polyline with SVG background</td> 679 <td>Set a background color for the SVG. 680 <br>Create a <code>polyline</code> element and fill it with a solid color. 681 <br>Apply a <code>mix-blend-mode</code> on it other than <code>normal</code>.</td> 682 <td>The color of the <code>polyline</code> is mixed with the color of the background.</td> 683 </tr> 684 <tr> 685 <td>Rect with SVG background</td> 686 <td>Set a background color for the SVG. 687 <br>Create a <code>rect</code> element and fill it with a solid color. 688 <br>Apply a <code>mix-blend-mode</code> on it other than <code>normal</code>.</td> 689 <td>The color of the <code>rect</code> is mixed with the color of the background.</td> 690 </tr> 691 <tr> 692 <td>Text with SVG background</td> 693 <td>Set a background color for the SVG. 694 <br>Create a <code>text</code> element and apply a <code>mix-blend-mode</code> other than <code>normal</code>.</td> 695 <td>The text is mixed with the color of the background.</td> 696 </tr> 697 <tr> 698 <td>Text having tspan with SVG background</td> 699 <td>Set a background color for the SVG. 700 <br>Create a <code>text</code> element and a <code>tspan</code> inside it. 701 <br>Apply a <code>mix-blend-mode</code> other than <code>normal</code> on the <code>tspan</code>.</td> 702 <td>The text is mixed with the color of the background.</td> 703 </tr> 704 <tr> 705 <td>Gradient with SVG background</td> 706 <td>Set a background color for the SVG. 707 <br>Create a <code>rect</code> element and fill it with a <code>gradient</code>. 708 <br>Apply a <code>mix-blend-mode</code> on it other than normal.</td> 709 <td>The gradient is mixed with the color of the background.</td> 710 </tr> 711 <tr> 712 <td>Pattern with SVG background</td> 713 <td>Set a background color for the SVG. 714 <br>Create a <code>rect</code> element and fill it with a <code>pattern</code>. 715 <br>Apply a <code>mix-blend-mode</code> on it other than normal.</td> 716 <td>The pattern is mixed with the color of the background.</td> 717 </tr> 718 <tr> 719 <td>Set blending on an element from JavaScript</td> 720 <td>Set a background color for the SVG. 721 <br>Create a <code>rect</code> element and fill it with a solid color. 722 <br>Apply a <code>mix-blend-mode</code> (other than <code>normal</code>) on it from JavaScript.</td> 723 <td>The color of the <code>rect</code> is mixed with the color of the background.</td> 724 </tr> 725 <tr> 726 <td>Marker with SVG background</td> 727 <td>Set a background color for the SVG. 728 <br>Create a <code>line</code> element containing a marker. 729 <br>Apply a <code>mix-blend-mode</code> other than <code>normal</code> on the marker.</td> 730 <td>The marker color is mixed with the color of the background.</td> 731 </tr> 732 <tr> 733 <td>Metadata with SVG background</td> 734 <td>Set a background color for the SVG. 735 <br>Create a <code>metadata</code> element containing an embedded pdf. 736 <br>Apply a <code>mix-blend-mode</code> other than <code>normal</code> on the marker.</td> 737 <td>The metadata content is not mixed with the color of the background.</td> 738 </tr> 739 <tr> 740 <td>ForeignObject with SVG background</td> 741 <td>Set a background color for the SVG. 742 <br>Create a <code>foreignObject</code> element containing a simple xhtml file. 743 <br>Apply a <code>mix-blend-mode</code> other than <code>normal</code> on the marker.</td> 744 <td>The foreignObject content is not mixed with the color of the background.</td> 745 </tr> 746 </table> 747 </section> 748 <section> 749 <h4><code>mix-blend-mode</code> with SVG groups</h4> 750 <table> 751 <tr> 752 <th>Test name</th> 753 <th>Elements and styles</th> 754 <th>Expected result</th> 755 </tr> 756 <tr> 757 <td>Group of overlapping elements with SVG background</td> 758 <td>Set a background color for the SVG. 759 <br>Create a <code>group</code> element containing two overlapping <code>rect</code> elements, each filled with a different solid color. 760 <br>Apply a <code>mix-blend-mode</code> other than <code>normal</code> on the group.</td> 761 <td>The <code>group</code> is mixed as a whole with the color of the background.</td> 762 </tr> 763 </table> 764 </section> 765 <section> 766 <h4><code>mix-blend-mode</code> with isolated groups</h4> 767 <p>Refers to the following assertion in the <a href="https://drafts.fxtf.org/compositing-1/#mix-blend-mode" >spec</a>: 768 <br><q>By default, every element must create a non-isolated group.<br> 769 However, certain operations in SVG will create isolated groups.<br> 770 If one of the following features is used, the group must become isolated: 771 <ul> 772 <li>opacity</li> 773 <li>filters</li> 774 <li>3D transforms (2D transforms must NOT cause isolation)</li> 775 <li>blending</li> 776 <li>masking</li> 777 </ul> 778 </q> 779 </p> 780 <table> 781 <tr> 782 <th>Test name</th> 783 <th>Elements and styles</th> 784 <th>Expected result</th> 785 </tr> 786 <tr> 787 <td>Blending two elements in an isolated group</td> 788 <td>Set a background color for the SVG.<br> 789 Create a <code>group</code> element containing two overlapping <code>rect</code> elements, each filled with a different solid color.<br> 790 Apply <code>opacity</code> less than 1 on the group and a <code>mix-blend-mode</code> other than <code>normal</code> on the second rect.</td> 791 <td>Only the intersection of the <code>rect</code> elements should mix.</td> 792 </tr> 793 <tr> 794 <td>Blending in a group with opacity</td> 795 <td>Set a background color for the SVG.<br> 796 Create a <code>group</code> element containing a <code>rect</code> element filled with a different solid color.<br> 797 Apply <code>opacity</code> less than 1 on the group and a <code>mix-blend-mode</code> other than <code>normal</code> on the <code>rect</code>.</td> 798 <td>The <code>rect</code> will not mix with the content behind it.</td> 799 </tr> 800 <tr> 801 <td>Blending in a group with filter</td> 802 <td>Set a background color for the SVG.<br> 803 Create a <code>group</code> element containing a <code>rect</code> element filled with a different solid color.<br> 804 Apply a <code>filter</code> on the group and a <code>mix-blend-mode</code> other than <code>normal</code> on the <code>rect</code>.</td> 805 <td>The <code>rect</code> will not mix with the content behind it.</td> 806 </tr> 807 <tr> 808 <td>Blending in a group with 2D transform</td> 809 <td>Set a background color for the SVG.<br> 810 Create a <code>group</code> element containing a <code>rect</code> element filled with a different solid color.<br> 811 Apply a <code>transform</code> on the group and a <code>mix-blend-mode</code> other than <code>normal</code> on the <code>rect</code>.</td> 812 <td>The <code>rect</code> will mix with the content behind it.</td> 813 </tr> 814 <tr> 815 <td>Blending in a group with 3D transform</td> 816 <td>Set a background color for the SVG.<br> 817 Create a <code>group</code> element containing a <code>rect</code> element filled with a different solid color.<br> 818 Apply a 3d transform on the group and a <code>mix-blend-mode</code> other than <code>normal</code> on the <code>rect</code>.</td> 819 <td>The <code>rect</code> will not mix with the content behind it.</td> 820 </tr> 821 <tr> 822 <td>Blending in a group with a mask</td> 823 <td>Set a background color for the SVG.<br> 824 Create a <code>group</code> element containing a <code>rect</code> element filled with a different solid color.<br> 825 Apply a <code>mask</code> on the group and a <code>mix-blend-mode</code> other than <code>normal</code> on the <code>rect</code>.</td> 826 <td>The <code>rect</code> will not mix with the content behind it.</td> 827 </tr> 828 <tr> 829 <td>Blending in a group with mix-blend-mode</td> 830 <td>Set a background color for the SVG.<br> 831 Create a <code>group</code> element containing a <code>rect</code> element filled with a different solid color.<br> 832 Apply a <code>mix-blend-mode</code> other than <code>normal</code> on the group and a <code>mix-blend-mode</code> other than <code>normal</code> on the <code>rect</code>.</td> 833 <td>The <code>rect</code> will not mix with the content behind it.</td> 834 </tr> 835 </table> 836 </section> 837 <section> 838 <h4>Other test cases for SVG</h4> 839 <table> 840 <tr> 841 <td>Blend with element having opacity</td> 842 <td>Set a background color for the SVG.<br> 843 Create a <code>rect</code> element filled with a different solid color.<br> 844 Apply <code>opacity</code> less than 1 and a <code>mix-blend-mode</code> other than <code>normal</code> on the <code>rect</code>.</td> 845 <td>The <code>rect</code> will mix with the content behind it.</td> 846 </tr> 847 <tr> 848 <td>Blend with element having stroke</td> 849 <td>Set a background color for the SVG.<br> 850 Create a <code>rect</code> element filled with a different solid color.<br> 851 Apply a <code>stroke</code> and a <code>mix-blend-mode</code> other than <code>normal</code> on the <code>rect</code>.</td> 852 <td>The <code>rect</code> will mix with the content behind it.</td> 853 </tr> 854 <tr> 855 <td>Blend with element having stroke-opacity</td> 856 <td>Set a background color for the SVG.<br> 857 Create a <code>rect</code> element filled with a different solid color.<br> 858 Apply a <code>stroke</code>, <code>stroke-opacity</code> less than 1 and a <code>mix-blend-mode</code> other than <code>normal</code> on the <code>rect</code>.</td> 859 <td>The <code>rect</code> will mix with the content behind it.</td> 860 </tr> 861 <tr> 862 <td>Blend with element having stroke-dasharray</td> 863 <td>Set a background color for the SVG.<br> 864 Create a <code>rect</code> element filled with a different solid color.<br> 865 Apply a <code>stroke-dasharray</code> and a <code>mix-blend-mode</code> other than <code>normal</code> on the <code>rect</code>.</td> 866 <td>The <code>rect</code> will mix with the content behind it.</td> 867 </tr> 868 <tr> 869 <td>Blend with element having transform</td> 870 <td>Set a background color for the SVG.<br> 871 Create an <code>image</code> element. Apply a <code>transform</code> (any combination of <code>translate</code>, <code>rotate</code>, <code>scale</code>, <code>skew</code>) and a <code>mix-blend-mode</code> other than <code>normal</code> on the <code>image</code>.</td> 872 <td>The <code>image</code> will mix with the content behind it.</td> 873 </tr> 874 <tr> 875 <td>Blend with SVG having viewbox and preserveAspectRatio set</td> 876 <td>Set a background color for the SVG, as well as <code>viewbox</code> and <code>preserveAspectRatio</code>.<br> 877 Create a <code>rect</code> element filled with a different solid color and apply a <code>mix-blend-mode</code> other than <code>normal</code> on it.</td> 878 <td>The <code>rect</code> will mix with the content behind it.</td> 879 </tr> 880 <tr> 881 <td>Blend with an element having color-profile set</td> 882 <td>Set a background color for the SVG.<br> 883 Create an <code>image</code> element. Apply a <code>color-profile</code> (<code>sRGB</code>, for example) and a <code>mix-blend-mode</code> other than <code>normal</code> on the <code>image</code>.</td> 884 <td>The <code>image</code> will mix with the content behind it.</td> 885 </tr> 886 <tr> 887 <td>Blend with an element having overflow</td> 888 <td>Set a background color for the SVG.<br> 889 Create an <code>image</code> larger than the SVG.<br> 890 Apply <code>overflow</code> (<code>visible</code>, <code>hidden</code>, <code>scroll</code>) and a <code>mix-blend-mode</code> other than <code>normal</code> on the <code>image</code>.</td> 891 <td>The <code>image</code> will mix with the content behind it.</td> 892 </tr> 893 <tr> 894 <td>Blend with an element having clip-path</td> 895 <td>Set a background color for the SVG.<br> 896 Create an <code>image</code> element. Apply a <code>clip-path</code> and a <code>mix-blend-mode</code> other than <code>normal</code> on the <code>image</code>.</td> 897 <td>The <code>image</code> will mix with the content behind it.</td> 898 </tr> 899 <tr> 900 <td>Blend with an element having a mask</td> 901 <td>Set a background color for the SVG.<br> 902 Create an <code>image</code> element.<br> 903 Apply a <code>mask</code> and a <code>mix-blend-mode</code> other than <code>normal</code> on the <code>image</code>.</td> 904 <td>The <code>image</code> will mix with the content behind it.</td> 905 </tr> 906 <tr> 907 <td>Blend with an element having a filter</td> 908 <td>Set a background color for the SVG.<br> 909 Create an <code>image</code> element.<br> 910 Apply a <code>filter</code> and a <code>mix-blend-mode</code> other than <code>normal</code> on the <code>image</code>.</td> 911 <td>The <code>image</code> will mix with the content behind it.</td> 912 </tr> 913 <tr> 914 <td>Blend with an animated element</td> 915 <td>Set a background color for the SVG.<br> 916 Create a <code>rect</code> element filled with a different solid color.<br> 917 Apply an <code>animateTransform</code> and a <code>mix-blend-mode</code> other than <code>normal</code> on the <code>rect</code>.</td> 918 <td>The <code>rect</code> will mix with the content behind it.</td> 919 </tr> 920 <tr> 921 <td>Set blending from an SVG script element</td> 922 <td>Set a background color for the SVG.<br> 923 Create a <code>rect</code> element and fill it with a solid color.<br> 924 Apply a <code>mix-blend-mode</code> (other than <code>normal</code>) on it from an svg <code>script</code> element.</td> 925 <td>The <code>rect</code> will mix with the content behind it.</td> 926 </tr> 927 </table> 928 </section> 929 </section> 930 <section> 931 <h3>Test cases for <code>background-blend-mode</code></h3> 932 <section> 933 <h4>Blending between the background layers and the background color for an element with <code>background-blend-mode</code> </h4> 934 <p>Refers to the following assertion in the <a href="https://drafts.fxtf.org/compositing-1/#background-blend-mode">spec</a>: <q>Each background layer must blend with the element's background layer that are below it and the element's background color.</q></p> 935 <table> 936 <tr> 937 <th>Test name</th> 938 <th>Elements and styles</th> 939 <th>Expected result</th> 940 </tr> 941 <tr> 942 <td>Images with different formats</td> 943 <td>Element with 944 <ul> 945 <li><code>background-image</code> set to an <code><image></code></li> 946 <li><code>background-color</code> set to a fully opaque color</li> 947 <li><code>background-blend-mode</code> other than normal</li> 948 </ul> 949 Tests should be created for <code><image></code> with different formats such as PNG, JPEG or SVG 950 </td> 951 <td>The content of the <code>background-image</code> is mixed with the color of the <code>background-color</code></td> 952 </tr> 953 <tr> 954 <td>Gradient and background color</td> 955 <td> 956 Element with 957 <ul> 958 <li><code>background-image</code> set to an <code><gradient></code></li> 959 <li><code>background-color</code> set to a fully opaque color</li> 960 <li><code>background-blend-mode</code> other than normal</li> 961 </ul> 962 </td> 963 <td>The content of the <code>background-image</code> is mixed with the color of the <code>background-color</code></td> 964 </tr> 965 <tr> 966 <td>Image and gradient</td> 967 <td> 968 Element with 969 <ul> 970 <li><code>background-image</code> set to an <code><image></code> on top of a <code><gradient></code></li> 971 <li><code>background-blend-mode</code> other than normal</li> 972 </ul> 973 </td> 974 <td>The content of the <code><image></code> is mixed with the content of the <code><gradient></code> 975 </td> 976 </tr> 977 <tr> 978 <td>Gradient and image</td> 979 <td>Element with 980 <ul> 981 <li><code>background-image</code> set to a <code><gradient></code> on top of an <code><image></code></li> 982 <li><code>background-blend-mode</code> other than normal</li> 983 </ul> 984 </td> 985 <td>The content of the <code><image></code> is mixed with the content of the <code><gradient></code></td> 986 </tr> 987 <tr> 988 <td>Two gradients</td> 989 <td>Element with 990 <ul> 991 <li><code>background-image</code> set to a <code><gradient></code> on top of another <code><gradient></code></li> 992 <li><code>background-blend-mode</code> other than normal</li> 993 </ul></td> 994 <td>The content of the two gradients is mixed</td> 995 </tr> 996 <tr> 997 <td>Two images</td> 998 <td>Element with 999 <ul> 1000 <li><code>background-image</code> set to an <code><image></code> on top of another <code><image></code></li> 1001 <li><code>background-blend-mode</code> other than normal</li> 1002 </ul></td> 1003 <td>The content of the two images is mixed</td> 1004 </tr> 1005 <tr> 1006 <td>Image and background color with transparency</td> 1007 <td>Element with 1008 <ul> 1009 <li><code>background-image</code> set to an <code><image></code> with transparency(e.g. PNG images)</li> 1010 <li><code>background-color</code> set to a transparent color</li> 1011 <li><code>background-blend-mode</code> other than normal</li> 1012 </ul> 1013 </td> 1014 <td>The content of the <code>background-image</code> is mixed with the color of the <code>background-color</code></td> 1015 </tr> 1016 <tr> 1017 <td>Cross-fade image and gradient</td> 1018 <td>Element with 1019 <ul> 1020 <li><code>background-image</code> set to a <q>cross-fade()</q> image on top of a <code><gradient></code> </li> 1021 <li><code>background-blend-mode</code> other than normal</li> 1022 </ul> 1023 </td> 1024 <td>The content of the cross-faded image is mixed with the content of the <code><gradient></code></td> 1025 </tr> 1026 <tr> 1027 <td>SVG image and background color</td> 1028 <td>Element with 1029 <ul> 1030 <li><code>background-image</code> set to a data URI for an SVG image </li> 1031 <li><code>background-color</code> set to a fully opaque color</li> 1032 <li><code>background-blend-mode</code> other than normal</li> 1033 </ul> 1034 </td> 1035 <td>The content of the image is mixed with the color of the background</td> 1036 </tr> 1037 <tr> 1038 <td>Animated gif image and background color</td> 1039 <td>Element with 1040 <ul> 1041 <li><code>background-image</code> set to an animated gif image</li> 1042 <li><code>background-color</code> set to a fully opaque color</li> 1043 <li><code>background-blend-mode</code> other than normal</li> 1044 </ul> 1045 </td> 1046 <td>The content of the image is mixed with the color of the background</td> 1047 </tr> 1048 <tr> 1049 <td>Set <code>background-blend-mode</code> from JavaScript</td> 1050 <td>Element with 1051 <ul> 1052 <li><code>background-image</code> set to a <code>gradient</code></li> 1053 <li><code>background-color</code> set to a fully opaque color</li> 1054 <li>no <code>background-blend-mode</code> explicitly specified</li> 1055 From JavaScript, set the <code>background-blend-mode</code> property to a value other than normal. 1056 </ul> 1057 </td> 1058 <td>The content of the gradient is mixed with the color of the background</td> 1059 </tr> 1060 <tr> 1061 <td><code>background-blend-mode</code> on element with 3D transform</td> 1062 <td>Element with 1063 <ul> 1064 <li><code>background-image</code> set to an <code><image></code></li> 1065 <li><code>background-color</code> set to a fully opaque color</li> 1066 <li><code>background-blend-mode</code> other than normal</li> 1067 <li><code>transform</code> set to a 3D function like rotateX, rotateY or translateZ</li> 1068 </ul> 1069 </td> 1070 <td>The content of the image is mixed with the color of the background</td> 1071 </tr> 1072 </table> 1073 </section> 1074 <section> 1075 <h4>Background layers do not blend with content outside the background (or behind the element)</h4> 1076 <p>Refers to the following assertion in the <a href="https://drafts.fxtf.org/compositing-1/#background-blend-mode">spec</a>: <q>Background layer must not blend with the content that is behind the element instead they must act as if they are rendered into an isolated group.</q> 1077 </p> 1078 <table> 1079 <tr> 1080 <th>Test name</th> 1081 <th>Elements and styles</th> 1082 <th>Expected result</th> 1083 </tr> 1084 <tr> 1085 <td>One background layer</td> 1086 <td>Element with 1087 <ul> 1088 <li><code>background-image</code> set to an <code><image></code></li> 1089 <li><code>background-blend-mode</code> other than normal</li> 1090 </ul> 1091 </td> 1092 <td>The <code>background-image</code> is not mixed with anything outside the element</td> 1093 </tr> 1094 <tr> 1095 <td>Two elements</td> 1096 <td>2 elements required: a parent element with a child. <br> 1097 Each one with the following properties: 1098 <ul> 1099 <li><code>background-color</code> set to a fully opaque color</li> 1100 <li><code>background-blend-mode</code> other than normal</li> 1101 </ul> 1102 <td>No blending between the background colors of the two elements</td> 1103 </tr> 1104 <tr> 1105 <td>Parent and child with <code>background-blend-mode</code></td> 1106 <td>2 elements required: a parent element with a child <br> 1107 Parent properties: <br> 1108 <ul> 1109 <li><code>background-color</code> set to a fully opaque color</li> 1110 <li><code>background-blend-mode</code> other than normal</li> 1111 </ul> 1112 Child properties: <br> 1113 <ul> 1114 <li><code>background-image</code> set to an <code><image></code></li> 1115 <li><code>background-blend-mode</code> other than normal</li> 1116 </ul> 1117 <td>The content of the image from the child element does not mixes with the background color from the parent element</td> 1118 </tr> 1119 </table> 1120 </section> 1121 <section> 1122 <h4> <code>background-blend-mode</code> list values apply to the corresponding background layer</h4> 1123 <p>Refers to the following assertion in the <a href="https://drafts.fxtf.org/compositing-1/#background-blend-mode">spec</a>: <q>The ‘background-blend-mode’ list must be applied in the same order as ‘background-image’[CSS3BG]. This means that the first element in the list will apply to the layer that is on top.</q> 1124 </p> 1125 <table> 1126 <tr> 1127 <th>Test name</th> 1128 <th>Elements and styles</th> 1129 <th>Expected result</th> 1130 </tr> 1131 <tr> 1132 <td>Different blend modes applied between layers</td> 1133 <td>Element with 1134 <ul> 1135 <li><code>background-image</code> set to an <code><image-list></code> containing three images: (e.g. I1, I2 and I3 ) </li> 1136 <li><code>background-blend-mode</code> set to different <code>blendmode</code> for every image: (e.g. multiply, difference, screen) </li> 1137 </ul></td> 1138 <td>The content of the three images is correctly mixed <br> 1139 (multiply for I1, difference for I2 and screen for I3) 1140 </td> 1141 </tr> 1142 </table> 1143 </section> 1144 <section> 1145 <h4><code>background-blend-mode</code> list values are repeated if the list is shorter than the background layer list</h4> 1146 <p>Refers to the following assertion in the <a href="https://drafts.fxtf.org/compositing-1/#background-blend-mode">spec</a>: <q>If a property doesn't have enough comma-separated values to match the number of layers, the UA must calculate its used value by repeating the list of values until there are enough.</q> 1147 </p> 1148 <table> 1149 <tr> 1150 <th>Test name</th> 1151 <th>Elements and styles</th> 1152 <th>Expected result</th> 1153 </tr> 1154 <tr> 1155 <td>Blend mode list repeat</td> 1156 <td>Element with 1157 <ul> 1158 <li><code>background-image</code> set to an <code><image-list></code> containing three images</li> 1159 <li><code>background-blend-mode</code> set to two different <code>blendmode</code> values</li> 1160 </ul></td> 1161 <td>The unspecified blend modes should be obtained by repeating the blend mode list from the beginning</td> 1162 </tr> 1163 </table> 1164 </section> 1165 <section> 1166 <h4>The default <code>background-blend-mode</code> value for the <code>background</code> shorthand is 'normal' </h4> 1167 <p>Refers to the following assertion in the <a href="https://drafts.fxtf.org/compositing-1/#background-blend-mode">spec</a>: <q>If the ‘background’ [CSS3BG] shorthand is used, the ‘background-blend-mode’ property for that element must be reset to its initial value.</q> 1168 </p> 1169 <table> 1170 <tr> 1171 <th>Test name</th> 1172 <th>Elements and styles</th> 1173 <th>Expected result</th> 1174 </tr> 1175 <tr> 1176 <td>Default blend mode for 'background' shorthand</td> 1177 <td>Element with 1178 <ul> 1179 <li><code>background</code> property set to an image and a color</li> 1180 <li>No value explicitly set for <code>background-blend-mode</code> </li> 1181 </ul></td> 1182 <td> The computed value of <code>background-blend-mode</code> is 'normal' 1183 </td> 1184 </tr> 1185 </table> 1186 </section> 1187 <section> 1188 <h4><code>background-blend-mode</code> for an element with <code>background-position</code></h4> 1189 <table> 1190 <tr> 1191 <th>Test name</th> 1192 <th>Elements and styles</th> 1193 <th>Expected result</th> 1194 </tr> 1195 <tr> 1196 <td><code>background-position</code> percentage</td> 1197 <td>Element with 1198 <ul> 1199 <li><code>background-image</code> set to an <code><image></code></li> 1200 <li><code>background-color</code> set to a fully opaque color</li> 1201 <li><code>background-position</code> specified in percentage, such as 50% 50%</li> 1202 <li><code>background-blend-mode</code> other than normal</li> 1203 </ul> 1204 </td> 1205 <td>The content of the <code>background-image</code> is mixed with the color of the <code>background-color</code> <br> 1206 The <code>background-image</code> is correctly positioned 1207 </td> 1208 </tr> 1209 </table> 1210 </section> 1211 <section> 1212 <h4><code>background-blend-mode</code> for an element with <code>background-size</code></h4> 1213 <table> 1214 <tr> 1215 <th>Test name</th> 1216 <th>Elements and styles</th> 1217 <th>Expected result</th> 1218 </tr> 1219 <tr> 1220 <td>Background size defined in pixels</td> 1221 <td>Element with 1222 <ul> 1223 <li><code>background-image</code> set to an <code><image></code></li> 1224 <li><code>background-color</code> set to a fully opaque color</li> 1225 <li><code>background-size</code> specified in pixels</li> 1226 <li><code>background-blend-mode</code> other than normal</li> 1227 </ul> 1228 </td> 1229 <td>The content of the <code>background-image</code> is mixed with the color of the <code>background-color</code> <br> 1230 The <code>background-image</code> has the correct size 1231 </td> 1232 </tr> 1233 <tr> 1234 <td>Background size defined in percentage (second phase)</td> 1235 <td>Element with 1236 <ul> 1237 <li><code>background-image</code> set to an <code><image></code></li> 1238 <li><code>background-color</code> set to a fully opaque color</li> 1239 <li><code>background-size</code> specified in percentage</li> 1240 <li><code>background-blend-mode</code> other than normal</li> 1241 </ul> 1242 </td> 1243 <td>The content of the <code>background-image</code> is mixed with the color of the <code>background-color</code> <br> 1244 The <code>background-image</code> has the correct size 1245 </td> 1246 </tr> 1247 <tr> 1248 <td>Background size cover</td> 1249 <td>Element with 1250 <ul> 1251 <li><code>background-image</code> set to an <code><image></code></li> 1252 <li><code>background-color</code> set to a fully opaque color</li> 1253 <li><code>background-size</code> set to <code>cover</code></li> 1254 <li><code>background-blend-mode</code> other than normal</li> 1255 </ul> 1256 </td> 1257 <td>The content of the <code>background-image</code> is mixed with the color of the <code>background-color</code> <br> 1258 The <code>background-image</code> has the correct size 1259 </td> 1260 </tr> 1261 <tr> 1262 <td>Background size contain</td> 1263 <td>Element with 1264 <ul> 1265 <li><code>background-image</code> set to an <code><image></code></li> 1266 <li><code>background-color</code> set to a fully opaque color</li> 1267 <li><code>background-size</code> set to <code>contain</code></li> 1268 <li><code>background-blend-mode</code> other than normal</li> 1269 </ul> 1270 </td> 1271 <td>The content of the <code>background-image</code> is mixed with the color of the <code>background-color</code> <br> 1272 The <code>background-image</code> has the correct size 1273 </td> 1274 </tr> 1275 </table> 1276 </section> 1277 <section> 1278 <h4><code>background-blend-mode</code> for an element with <code>background-repeat</code></h4> 1279 <table> 1280 <tr> 1281 <th>Test name</th> 1282 <th>Elements and styles</th> 1283 <th>Expected result</th> 1284 </tr> 1285 <tr> 1286 <td><code>background-repeat</code> set to no-repeat</td> 1287 <td>Element with 1288 <ul> 1289 <li><code>background-image</code> set to an <code><image></code></li> 1290 <li><code>background-color</code> set to a fully opaque color</li> 1291 <li><code>background-repeat</code> set to <code>no-repeat</code></li> 1292 <li><code>background-blend-mode</code> other than normal</li> 1293 </ul> 1294 </td> 1295 <td>The content of the <code>background-image</code> is mixed with the color of the <code>background-color</code> <br> 1296 The <code>background-image</code> is not repeated 1297 </td> 1298 </tr> 1299 <tr> 1300 <td><code>background-repeat</code> set to space</td> 1301 <td>Element with 1302 <ul> 1303 <li><code>background-image</code> set to an <code><image></code></li> 1304 <li><code>background-color</code> set to a fully opaque color</li> 1305 <li><code>background-repeat</code> set to <code>space</code></li> 1306 <li><code>background-blend-mode</code> other than normal</li> 1307 </ul> 1308 </td> 1309 <td>The content of the <code>background-image</code> is mixed with the color of the <code>background-color</code> <br> 1310 </td> 1311 </tr> 1312 <tr> 1313 <td><code>background-repeat</code> set to round</td> 1314 <td>Element with 1315 <ul> 1316 <li><code>background-image</code> set to an <code><image></code></li> 1317 <li><code>background-color</code> set to a fully opaque color</li> 1318 <li><code>background-repeat</code> set to <code>round</code></li> 1319 <li><code>background-blend-mode</code> other than normal</li> 1320 </ul> 1321 </td> 1322 <td>The content of the <code>background-image</code> is mixed with the color of the <code>background-color</code> <br> 1323 </td> 1324 </tr> 1325 </table> 1326 </section> 1327 <section> 1328 <h4><code>background-blend-mode</code> for an element with <code>background-clip</code></h4> 1329 <table> 1330 <tr> 1331 <th>Test name</th> 1332 <th>Elements and styles</th> 1333 <th>Expected result</th> 1334 </tr> 1335 <tr> 1336 <td><code>background-clip</code> set to <code>padding-box</code></td> 1337 <td>Element with 1338 <ul> 1339 <li><code>background-image</code> set to an <code><image></code></li> 1340 <li><code>background-color</code> set to a fully opaque color</li> 1341 <li><code>background-clip</code> set to <code>padding-box</code></li> 1342 <li><code>background-blend-mode</code> other than normal</li> 1343 </ul> 1344 </td> 1345 <td>The content of the <code>background-image</code> is mixed with the color of the <code>background-color</code> <br> 1346 No background is drawn below the border (background extends to the outside edge of the padding) 1347 </td> 1348 </tr> 1349 <tr> 1350 <td><code>background-clip</code> set to <code>content-box</code></td> 1351 <td>Element with 1352 <ul> 1353 <li><code>background-image</code> set to an <code><image></code></li> 1354 <li><code>background-color</code> set to a fully opaque color</li> 1355 <li><code>background-clip</code> set to <code>content-box</code></li> 1356 <li><code>background-blend-mode</code> other than normal</li> 1357 </ul> 1358 </td> 1359 <td>The content of the <code>background-image</code> is mixed with the color of the <code>background-color</code> <br> 1360 The background is painted within (clipped to) the content box 1361 </td> 1362 </tr> 1363 </table> 1364 </section> 1365 <section> 1366 <h4><code>background-blend-mode</code> for an element with <code>background-origin</code></h4> 1367 <table> 1368 <tr> 1369 <th>Test name</th> 1370 <th>Elements and styles</th> 1371 <th>Expected result</th> 1372 </tr> 1373 <tr> 1374 <td><code>background-origin</code> set to <code>border-box</code></td> 1375 <td>Element with 1376 <ul> 1377 <li><code>background-image</code> set to an <code><image></code></li> 1378 <li><code>background-color</code> set to a fully opaque color</li> 1379 <li><code>background-origin</code> set to <code>border-box</code></li> 1380 <li><code>background-blend-mode</code> other than normal</li> 1381 </ul> 1382 </td> 1383 <td>The content of the <code>background-image</code> is mixed with the color of the <code>background-color</code> <br> 1384 The background extends to the outside edge of the border (but underneath the border in z-ordering) 1385 </td> 1386 </tr> 1387 <tr> 1388 <td><code>background-origin</code> set to <code>content-box</code></td> 1389 <td>Element with 1390 <ul> 1391 <li><code>background-image</code> set to an <code><image></code></li> 1392 <li><code>background-color</code> set to a fully opaque color</li> 1393 <li><code>background-origin</code> set to <code>content-box</code></li> 1394 <li><code>background-blend-mode</code> other than normal</li> 1395 </ul> 1396 </td> 1397 <td>The content of the <code>background-image</code> is mixed with the color of the <code>background-color</code> <br> 1398 The background is painted within (clipped to) the content box 1399 </td> 1400 </tr> 1401 </table> 1402 </section> 1403 <section> 1404 <h4><code>background-blend-mode</code> for an element with <code>background-attachement</code></h4> 1405 <table> 1406 <tr> 1407 <th>Test name</th> 1408 <th>Elements and styles</th> 1409 <th>Expected result</th> 1410 </tr> 1411 <tr> 1412 <td><code>background-attachment</code> set to <code>fixed</code></td> 1413 <td>Element with 1414 <ul> 1415 <li><code>background-image</code> set to an <code><image></code></li> 1416 <li><code>background-color</code> set to a fully opaque color</li> 1417 <li><code>background-attachment</code> set to <code>fixed</code></li> 1418 <li><code>background-blend-mode</code> other than normal</li> 1419 </ul> 1420 </td> 1421 <td>The content of the <code>background-image</code> is mixed with the color of the <code>background-color</code> <br> 1422 The background image will not scroll with its containing element, instead remaining stationary within the viewport 1423 </td> 1424 </tr> 1425 <tr> 1426 <td>2 background images with <code>background-attachment</code> set to <code>fixed, scroll</code></td> 1427 <td>Element with 1428 <ul> 1429 <li><code>background-image</code> set to 2 <code><image></code>(s)</li> 1430 <li><code>background-attachment</code> set to <code>fixed, scroll</code></li> 1431 <li><code>background-blend-mode</code> other than normal</li> 1432 </ul> 1433 </td> 1434 <td>The background images will be mixed when they overlap while scrolling 1435 </td> 1436 </tr> 1437 </table> 1438 </section> 1439 </section> 1440 <section> 1441 <h3>Test cases for <code>isolation</code></h3> 1442 <section> 1443 <h4>An element with <code>isolation:isolate</code> creates a stacking context</h4> 1444 <p>Refers to the following assertion in the <a href="https://drafts.fxtf.org/compositing-1/#csscompositingrules_CSS">spec</a>: <q>For CSS, setting ‘isolation’ to ‘isolate’ will turn the element into a stacking context [CSS21].</q></p> 1445 <table> 1446 <tr> 1447 <th>Test name</th> 1448 <th>Elements and styles</th> 1449 <th>Expected result</th> 1450 </tr> 1451 <tr> 1452 <td>Isolation isolate</td> 1453 <td>Have an element with <code>isolation</code> set to <code>isolate</code></td> 1454 <td>The element creates a stacking context.</td> 1455 </tr> 1456 </table> 1457 </section> 1458 <section> 1459 <h4>An element with <code>isolation:isolate</code> creates an isolated group for blended children</h4> 1460 <table> 1461 <tr> 1462 <th>Test name</th> 1463 <th>Elements and styles</th> 1464 <th>Expected result</th> 1465 </tr> 1466 <tr> 1467 <td>Isolation of blended child which overflows</td> 1468 <td>3 elements required: 1469 <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a>, 1470 <a href="#test_outline" title="child of the element [P]">[IN-P]</a> and 1471 <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br> 1472 [P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br> 1473 [IN-P] - Intermediate child element between the parent [P] and the child [B]<br> 1474 This element has <code>isolation:isolate</code> set.<br> 1475 [B] - element with <code>mix-blend-mode</code> other than <code>normal</code> <br> 1476 The blending element [B] has content that lies outside the parent element. <br> 1477 </td> 1478 <td> 1479 The color of the child element [B] mixes with the color of the intermediate element [IN-P], where they overlap.<br> 1480 The area of the child element outside of the intermediate parent element does not mix with the color of the parent element [P], or of the <code>body</code>. 1481 </td> 1482 </tr> 1483 <tr> 1484 <td>Isolation on intermediate element with transparent pixels</td> 1485 <td>3 elements required: 1486 <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a>, 1487 <a href="#test_outline" title="child of the element [P]">[IN-P]</a> and 1488 <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br> 1489 [P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>); the element <code>background-color</code> is other than <code>transparent</code><br> 1490 [IN-P] - Intermediate child element between the parent [P] and the child [B]<br> 1491 The intermediate element has text content, default value for <code>background-color</code> and <code>isolation:isolate</code> set<br> 1492 [B] - element with <code>mix-blend-mode</code> other than <code>normal</d <br> 1493 <td> 1494 The color of the child element [B] mixes with the color of the intermediate element [IN-P], where they overlap.<br> 1495 There is no blending between the color of the parent element [P] and the color of the blended element [B]. 1496 </td> 1497 </tr> 1498 <tr> 1499 <td>Isolate inside a stacking context created by a 3d transform</td> 1500 <td> 1501 3 elements required: 1502 <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a>, 1503 <a href="#test_outline" title="child of the element [P]">[IN-P]</a> and 1504 <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br> 1505 [P] - parent element with a <code>3D transform</code> applied<br> 1506 [IN-P] - Intermediate child element between the parent [P] and the child [B]<br> 1507 The intermediate element has <code>isolation:isolate</code> set<br> 1508 [B] - element with <code>mix-blend-mode</code> other than <code>normal</code><br> 1509 </td> 1510 <td> 1511 The color of the child element [B] mixes with the color of the intermediate element [IN-P], where they overlap.<br> 1512 There is no blending between the color of the parent element [P] and the color of the blended element [B]. 1513 </td> 1514 </tr> 1515 </table> 1516 </section> 1517 <section> 1518 <h4>An element with <code>isolation:auto</code> set does not change the elements existing stacking context behavior</h4> 1519 <table> 1520 <tr> 1521 <th>Test name</th> 1522 <th>Elements and styles</th> 1523 <th>Expected result</th> 1524 </tr> 1525 <tr> 1526 <td>Isolation auto</td> 1527 <td>Have an element with <code>isolation</code> explicitly set to <code>auto</code>, and no other style that would create a stacking context</td> 1528 <td>The element does not create a stacking context - the computed value of its <code>z-index</code> is value <code>auto</code></td> 1529 </tr> 1530 <tr> 1531 <td>Stacking context not affected by isolation</td> 1532 <td>2 elements required: 1533 <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and 1534 <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br> 1535 [P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>); This element has <code>isolation</code> explicitly set to <code>auto</code> <br> 1536 [B] - element with <code>mix-blend-mode</code> other than <code>normal</code> <br> 1537 The blending element [B] has content that lies outside the parent element. <br> 1538 Set the <code>background-color</code> of the <code>body</code> to a value other than default 1539 </td> 1540 <td>The color of the parent element mixes with the color of the child element. <br> 1541 The area of the child element outside of the parent element doesn't mix with the color of the <code>body</code>.<br> 1542 In other words, setting the <code>isolation</code> to <code>auto</code> does not affect the creation of a stacking context by other properties. 1543 </td> 1544 </tr> 1545 </table> 1546 </section> 1547 </section> 1548 <section> 1549 <h4>Test cases for <code>isolation</code> in SVG</h4> 1550 <section> 1551 <h4>In SVG, an element with <code>isolation:isolate</code> creates an isolated group for blended children</h4> 1552 <p>Refers to the following assertion in the <a href="https://drafts.fxtf.org/compositing-1/#isolation">spec</a>: <q>In SVG, this defines whether an element is isolated or not.</q></p> 1553 <table> 1554 <tr> 1555 <th>Test name</th> 1556 <th>Elements and styles</th> 1557 <th>Expected result</th> 1558 </tr> 1559 <tr> 1560 <td>Blending in an isolated group</td> 1561 <td>Set a background color for the SVG.<br> 1562 Create a <code>group</code> element containing a <code>rect</code> element filled with a different solid color.<br> 1563 Apply <code>isolation:isolate</code> on the group and a <code>mix-blend-mode</code> other than <code>normal</code> on the <code>rect</code>.</td> 1564 <td>The <code>rect</code> will not mix with the content behind it.</td> 1565 </tr> 1566 <tr> 1567 <td>Blending two elements in an isolated group</td> 1568 <td>Set a background color for the SVG.<br> 1569 Create a <code>group</code> element containing two overlapping <code>rect</code> elements, each filled with a different solid color.<br> 1570 Apply <code>isolation:isolate</code> on the group and a <code>mix-blend-mode</code> other than <code>normal</code> on the second rect.</td> 1571 <td>Only the intersection of the <code>rect</code> elements should mix.</td> 1572 </tr> 1573 <tr> 1574 <td>Blending in an isolated group with 2D transform</td> 1575 <td>Set a background color for the SVG.<br> 1576 Create a <code>group</code> element containing a <code>rect</code> element filled with a different solid color.<br> 1577 Apply <code>isolation:isolate</code> and 2D transform on the group and a <code>mix-blend-mode</code> other than <code>normal</code> on the <code>rect</code>.</td> 1578 <td>The <code>rect</code> will not mix with the content behind it.</td> 1579 </tr> 1580 <tr> 1581 <td>Set isolation on an element from JavaScript</td> 1582 <td>Set a background color for the SVG. 1583 <br>Create a <code>rect</code> element and fill it with a solid color and a <code>mix-blend-mode</code> other than <code>normal</code>. 1584 <br>Apply <code>isolation:isolate</code> on it from JavaScript.</td> 1585 <td>The <code>rect</code> will not mix with the content behind it.</td> 1586 </tr> 1587 </table> 1588 </section> 1589 <section> 1590 <h4>In SVG, an element with <code>isolation:auto</code> set does not change the rendering behaviour</h4> 1591 <table> 1592 <tr> 1593 <th>Test name</th> 1594 <th>Elements and styles</th> 1595 <th>Expected result</th> 1596 </tr> 1597 <tr> 1598 <td>Blending a group with <code>isolation:auto</code></td> 1599 <td>Set a background color for the SVG.<br> 1600 Create a <code>group</code> element containing a <code>rect</code> element filled with a different solid color.<br> 1601 Apply <code>isolation:auto</code> on the group and a <code>mix-blend-mode</code> other than <code>normal</code> on the <code>rect</code>.</td> 1602 <td>The element will mix with the content behind it.</td> 1603 </tr> 1604 <tr> 1605 <td>Blending in a group with opacity</td> 1606 <td>Set a background color for the SVG.<br> 1607 Create a <code>group</code> element containing a <code>rect</code> element filled with a different solid color.<br> 1608 Apply <code>opacity</code> less than 1 and <code>isolation:auto</code> on the group and a <code>mix-blend-mode</code> other than <code>normal</code> on the <code>rect</code>.</td> 1609 <td>The <code>rect</code> will not mix with the content behind it.</td> 1610 </tr> 1611 </table> 1612 </section> 1613 </section> 1614 </body> 1615 </html>