shift-with-overflow-status-change.html (1290B)
1 <!DOCTYPE html> 2 <title>Layout Instability: change under overflow clipping container causing shift and overflow status change at the same time</title> 3 <link rel="help" href="https://wicg.github.io/layout-instability/" /> 4 <script src="/resources/testharness.js"></script> 5 <script src="/resources/testharnessreport.js"></script> 6 <script src="resources/util.js"></script> 7 <div style="height: 100px"></div> 8 <div style="overflow: auto; width: 400px; height: 400px"> 9 <div id="resized" style="width: 600px; height: 100px; background: gray"></div> 10 <div id="shifted" style="width: 300px; height: 100px; background: blue"></div> 11 </div> 12 <script> 13 promise_test(async () => { 14 const watcher = new ScoreWatcher; 15 16 // Wait for the initial render to complete. 17 await waitForAnimationFrames(2); 18 19 resized.style.width = '200px'; 20 resized.style.height = '200px'; 21 22 const expectedScore = computeExpectedScore(300 * (100 + 100), 100); 23 24 assert_equals(watcher.score, 0); 25 await watcher.promise; 26 assert_equals(watcher.score, expectedScore); 27 28 resized.style.width = '600px'; 29 resized.style.height = '100px'; 30 await watcher.promise; 31 assert_equals(watcher.score, expectedScore * 2); 32 }, 'Change under overflow clipping container causing shift and overflow status change at the same time'); 33 </script>