| <!DOCTYPE html> |
| |
| <html> |
| <head> |
| <style> |
| .box { |
| width: 100px; |
| height: 100px; |
| margin: 10px; |
| background-color: blue; |
| border: 2px solid black; |
| -webkit-transform: translateZ(0); |
| } |
| |
| .colorchange { |
| background-color: green; |
| } |
| |
| .dummy { |
| /* Empty. */ |
| } |
| |
| </style> |
| <script src="../../resources/js-test-pre.js"></script> |
| <script src="../../resources/ui-helper.js"></script> |
| <script> |
| description('Test that compositing updates do not happen for style changes that do not need them.'); |
| window.jsTestIsAsync = true; |
| |
| var updateCount; |
| |
| async function zeroUpdateCount() |
| { |
| if (window.internals) { |
| await UIHelper.renderingUpdate(); |
| internals.startTrackingCompositingUpdates(); |
| } |
| } |
| |
| async function updateLayoutAndCompositingCount() |
| { |
| if (window.internals) { |
| await UIHelper.renderingUpdate(); |
| updateCount = internals.compositingUpdateCount(); |
| } |
| } |
| |
| async function testForCompositingUpdate(callback) |
| { |
| await zeroUpdateCount(); |
| callback(); |
| await updateLayoutAndCompositingCount(); |
| } |
| |
| async function runTest() |
| { |
| await updateLayoutAndCompositingCount(); |
| |
| if (window.internals) { |
| internals.startTrackingCompositingUpdates(); |
| updateCount = internals.compositingUpdateCount(); |
| } |
| |
| shouldBe('updateCount', '0'); |
| |
| await testForCompositingUpdate(function() { |
| document.getElementById('box').classList.add('colorchange'); |
| }); |
| |
| shouldBe('updateCount', '1'); |
| |
| await testForCompositingUpdate(function() { |
| document.getElementById('box').classList.add('dummy'); |
| }); |
| |
| shouldBe('updateCount', '0'); |
| |
| await testForCompositingUpdate(function() { |
| var div = document.createElement('div'); |
| div.className = 'box'; |
| document.body.appendChild(div); |
| }); |
| |
| shouldBe('updateCount', '1'); |
| |
| await testForCompositingUpdate(function() { |
| var stylesheet = document.createElement('style'); |
| stylesheet.type = 'text/css'; |
| stylesheet.rel = 'stylesheet'; |
| stylesheet.textContent = '.unmatched { border: 5px solid blue; }'; |
| document.getElementsByTagName("head")[0].appendChild(stylesheet); |
| }); |
| |
| shouldBe('updateCount', '0'); |
| |
| finishJSTest(); |
| } |
| |
| window.addEventListener('load', function() { |
| window.setTimeout(runTest, 200); |
| }, false); |
| </script> |
| |
| </head> |
| <body> |
| <div id="box" class="box"></div> |
| |
| <script src="../../resources/js-test-post.js"></script> |
| </body> |
| </html> |
