<!DOCTYPE html> <title>Layout Instability: fully clipped by contain:paint</title> <link rel="help" href="https://wicg.github.io/layout-instability/" /> <div style="contain: paint; height: 0; position: relative"> <div id="target" style="position: absolute; top: 0; width: 400px; height: 400px; background: blue"></div> </div> <script src="/resources/testharness.js"></script> <script src="/resources/testharnessreport.js"></script> <script src="resources/util.js"></script> <script> promise_test(async () => { const watcher = new ScoreWatcher; // Wait for the initial render to complete. await waitForAnimationFrames(2); // Shift target, for which no shift should be reported because it's hidden. document.querySelector("#target").style.top = '200px'; await waitForAnimationFrames(2); // No shift should be reported. assert_equals(watcher.score, 0); }, 'fully clipped by contain:paint'); </script>