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Test Info:

<!DOCTYPE html>
<title>Invalid animation range</title>
<body onload="runTest()">
<div id="target"></div>
</body>
<script src="../../web-animations/testcommon.js"></script>
<script>
async function runTest() {
const anim = target.animate(undefined, {rangeStart: "initial" });
await waitForNextFrame();
await waitForNextFrame();
}
</script>