CSSStyleSheet-constructable-duplicate.html (3704B)
1 <!doctype html> 2 <title>Cascade order of a stylesheet for duplicate sheets.</title> 3 <link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io"> 4 <link rel="help" href="https://wicg.github.io/construct-stylesheets/"> 5 <script src = '/resources/testharness.js'></script> 6 <script src = '/resources/testharnessreport.js'></script> 7 <div id="target"></div> 8 <script> 9 10 function attachShadowDiv(host) { 11 const shadowRoot = host.attachShadow({mode: 'open'}); 12 const shadowDiv = document.createElement("div"); 13 shadowRoot.appendChild(shadowDiv); 14 return shadowDiv; 15 } 16 17 function blueSheetsWithIncreasingZIndex(n) { 18 let sheets = []; 19 for (let i = 0; i < n; ++i) { 20 sheets.push(new CSSStyleSheet()); 21 sheets[i].replaceSync("div { z-index: " + i + "; color: blue; }"); 22 } 23 return sheets; 24 } 25 26 let sheets = []; 27 28 test(function() { 29 sheets = blueSheetsWithIncreasingZIndex(2); 30 31 document.adoptedStyleSheets = [sheets[1], sheets[0], sheets[1]]; 32 assert_equals(getComputedStyle(document.querySelector("div")).zIndex, "1", "duplicate stylesheet should take right position in the cascade"); 33 34 document.adoptedStyleSheets = []; 35 }, "Duplicate stylesheets have the right cascade position in the Document"); 36 37 test(function() { 38 sheets = blueSheetsWithIncreasingZIndex(2); 39 40 const sheet = new CSSStyleSheet(); 41 sheet.replaceSync("div { color: red; }"); 42 43 document.adoptedStyleSheets = [sheets[1], sheets[0]]; 44 assert_equals(getComputedStyle(document.querySelector("div")).zIndex, "0", "backmost stylesheet should take precedence"); 45 assert_equals(getComputedStyle(document.querySelector("div")).color, "rgb(0, 0, 255)", "backmost stylesheet should take precedence"); 46 47 document.adoptedStyleSheets = [sheets[1], sheets[0], sheets[1], sheet]; 48 assert_equals(getComputedStyle(document.querySelector("div")).zIndex, "1", "duplicate stylesheet should take the right position in the cascade"); 49 assert_equals(getComputedStyle(document.querySelector("div")).color, "rgb(255, 0, 0)", "backmost stylesheet should take precedence"); 50 51 document.adoptedStyleSheets = []; 52 }, "Appending duplicate stylesheets yields the correct cascade position in the Document"); 53 54 test(function() { 55 sheets = blueSheetsWithIncreasingZIndex(2); 56 57 const span = document.createElement("span"); 58 target.appendChild(span); 59 attachShadowDiv(span); 60 61 span.shadowRoot.adoptedStyleSheets = [sheets[1], sheets[0], sheets[1]]; 62 assert_equals(getComputedStyle(span.shadowRoot.querySelector("div")).zIndex, "1", "duplicate stylesheet should take right position in the cascade"); 63 }, "Duplicate stylesheets have the right cascade position in the ShadowRoot"); 64 65 test(function() { 66 sheets = blueSheetsWithIncreasingZIndex(2); 67 68 const sheet = new CSSStyleSheet(); 69 sheet.replaceSync("div { color: red; }"); 70 71 const span = document.createElement("span"); 72 target.appendChild(span); 73 attachShadowDiv(span); 74 75 span.shadowRoot.adoptedStyleSheets = [sheets[1], sheets[0]]; 76 assert_equals(getComputedStyle(span.shadowRoot.querySelector("div")).zIndex, "0", "backmost stylesheet should take precedence"); 77 assert_equals(getComputedStyle(span.shadowRoot.querySelector("div")).color, "rgb(0, 0, 255)", "backmost stylesheet should take precedence"); 78 79 span.shadowRoot.adoptedStyleSheets = [sheets[1], sheets[0], sheets[1], sheet]; 80 assert_equals(getComputedStyle(span.shadowRoot.querySelector("div")).zIndex, "1", "duplicate stylesheet should take right position in the cascade"); 81 assert_equals(getComputedStyle(span.shadowRoot.querySelector("div")).color, "rgb(255, 0, 0)", "backmost stylesheet should take precedence"); 82 }, "Appending duplicate stylesheets yields the correct cascade position in the ShadowRoot"); 83 84 </script>