ttwf-cssom-doc-ext-load-count.html (2760B)
1 <!DOCTYPE html> 2 <html> 3 <head> 4 <title>CSSOM - Extensions to the Document Interface: StyleSheetList length reflects dynamically loaded and unloaded sheets</title> 5 <link rel="author" title="Jesse Bounds" href="mailto:jesse@codeforamerica.org"> 6 <link rel="help" href="http://www.w3.org/TR/cssom-1/#extensions-to-the-document-interface"> 7 <link rel="help" href="http://www.w3.org/TR/cssom-1/#the-stylesheetlist-interface"> 8 <link rel="help" href="http://www.w3.org/TR/cssom-1/#css-style-sheet-collections"> 9 <link rel="stylesheet" href="stylesheet.css" type="text/css"> 10 <meta name="flags" content="dom"> 11 <meta name="assert" content="The styleSheets length attribute must reflect the number of sheets at page load and after dynamically"> 12 <script src="/resources/testharness.js"></script> 13 <script src="/resources/testharnessreport.js"></script> 14 </head> 15 <body> 16 <div id="log"></div> 17 <script> 18 19 // Get the Document's styleSheets attribute 20 var styleSheets = document.styleSheets; 21 22 // Verify that the styleSheets list length is 1 due to "stylesheet.css" loaded in head section 23 test(function() { 24 assert_equals(styleSheets.length, 1, "styleSheets.length is incorrect:"); 25 }, "stylesheet.css should be loaded and styleSheets.length === 1"); 26 27 // Verify that the styleSheets list length is 0 after removing the loaded sheet from the DOM 28 test(function() { 29 30 // get the one and only sheet loaded 31 var sheet = styleSheets.item(0); 32 33 // remove the sheet from the DOM 34 sheet.ownerNode.parentNode.removeChild(sheet.ownerNode) 35 36 // assert that there are 0 styleSheets in the styleSheets property 37 assert_equals(styleSheets.length, 0, "styleSheets.length is incorrect:"); 38 39 }, "stylesheet.css should be unloaded and styleSheets.length === 0"); 40 41 // Verify that the styleSheets list length is back to 1 after loading a new sheet 42 async_test(function(t) { 43 44 // create a css file reference 45 var fileReference = document.createElement("link"); 46 fileReference.setAttribute("rel", "stylesheet"); 47 fileReference.setAttribute("type", "text/css"); 48 fileReference.setAttribute("href", "stylesheet-1.css"); 49 fileReference.onerror = t.step_func_done(function() { 50 // assert that there is 1 styleSheet in the styleSheets property 51 assert_equals(styleSheets.length, 1, "styleSheets.length is incorrect:"); 52 }); 53 54 // load the css file reference into the head section 55 var head = document.getElementsByTagName("HEAD")[0]; 56 head.appendChild(fileReference); 57 }, "stylesheet-1.css should be loaded and styleSheets.length === 1"); 58 59 </script> 60 </body> 61 </html>