| <!DOCTYPE html> |
| <html> |
| <head> |
| <title>CSSOM - Extensions to the Document Interface: StyleSheetList length reflects dynamically loaded and unloaded sheets</title> |
| <link rel="author" title="Jesse Bounds" href="mailto:jesse@codeforamerica.org"> |
| <link rel="help" href="http://www.w3.org/TR/cssom-1/#extensions-to-the-document-interface"> |
| <link rel="help" href="http://www.w3.org/TR/cssom-1/#the-stylesheetlist-interface"> |
| <link rel="help" href="http://www.w3.org/TR/cssom-1/#css-style-sheet-collections"> |
| <link rel="stylesheet" href="stylesheet.css" type="text/css"> |
| <meta name="flags" content="dom"> |
| <meta name="assert" content="The styleSheets length attribute must reflect the number of sheets at page load and after dynamically"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| </head> |
| <body> |
| <div id="log"></div> |
| <script> |
| |
| // Get the Document's styleSheets attribute |
| var styleSheets = document.styleSheets; |
| |
| // Verify that the styleSheets list length is 1 due to "stylesheet.css" loaded in head section |
| test(function() { |
| assert_equals(styleSheets.length, 1, "styleSheets.length is incorrect:"); |
| }, "stylesheet.css should be loaded and styleSheets.length === 1"); |
| |
| // Verify that the styleSheets list length is 0 after removing the loaded sheet from the DOM |
| test(function() { |
| |
| // get the one and only sheet loaded |
| var sheet = styleSheets.item(0); |
| |
| // remove the sheet from the DOM |
| sheet.ownerNode.parentNode.removeChild(sheet.ownerNode) |
| |
| // assert that there are 0 styleSheets in the styleSheets property |
| assert_equals(styleSheets.length, 0, "styleSheets.length is incorrect:"); |
| |
| }, "stylesheet.css should be unloaded and styleSheets.length === 0"); |
| |
| // Verify that the styleSheets list length is back to 1 after loading a new sheet |
| async_test(function(t) { |
| |
| // create a css file reference |
| var fileReference = document.createElement("link"); |
| fileReference.setAttribute("rel", "stylesheet"); |
| fileReference.setAttribute("type", "text/css"); |
| fileReference.setAttribute("href", "stylesheet-1.css"); |
| fileReference.onerror = t.step_func_done(function() { |
| // assert that there is 1 styleSheet in the styleSheets property |
| assert_equals(styleSheets.length, 1, "styleSheets.length is incorrect:"); |
| }); |
| |
| // load the css file reference into the head section |
| var head = document.getElementsByTagName("HEAD")[0]; |
| head.appendChild(fileReference); |
| }, "stylesheet-1.css should be loaded and styleSheets.length === 1"); |
| |
| </script> |
| </body> |
| </html> |
