<!DOCTYPE html> <title>Inserting animation elements that end before current presentation time</title> <link rel="help" href="https://www.w3.org/TR/2001/REC-smil-animation-20010904/#Timing-BeginEnd-LC-Start"> <script src="/resources/testharness.js"></script> <script src="/resources/testharnessreport.js"></script> <script src="/common/rendering-utils.js"></script> <svg> <rect width="100" height="100" fill="orange"> <animate attributeName="fill" values="blue;red" dur="10ms" fill="freeze"/> </rect> </svg> <script> promise_test(t => { const rect = document.querySelector('rect'); const endWatcher = new Promise(resolve => { document.querySelector('animate').onend = resolve; }); return endWatcher .then(() => { const oldAnimation = rect.firstElementChild; const newAnimation = oldAnimation.cloneNode(false); newAnimation.setAttribute('values', 'red;green'); rect.replaceChild(newAnimation, oldAnimation); return waitForAtLeastOneFrame(); }) .then(() => { assert_equals(getComputedStyle(rect).fill, 'rgb(0, 128, 0)', 'new animation applies'); }); }); </script>