<!DOCTYPE html> <title>Layout Instability: opacity:0</title> <link rel="help" href="https://wicg.github.io/layout-instability/" /> <div id="target" style="position: absolute; top: 0; width: 200px; height: 200px; opacity: 0; background: blue"></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 not visible. target.style.top = '200px'; target.style.opacity = 0.9; await waitForAnimationFrames(2); assert_equals(watcher.score, 0); // Shift again, for which shift should be reported. target.style.top = '300px'; await watcher.promise; const expectedScore = computeExpectedScore(200 * (200 + 100), 100); assert_equals(watcher.score, expectedScore); }, 'opacity:0'); </script>