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Test Info:
<!DOCTYPE html>
<html class="reftest-wait">
<head>
<meta charset="UTF-8">
<script>
window.onload = function(){
let a = document.documentElement.animate(null,
{ duration: 100, iterations: Number.POSITIVE_INFINITY });
a.startTime = 100000; // Set the start time far in the future
// Try reversing (this should throw because the target effect end is infinity)
try { a.reverse(); } catch(e) {}
// Do something that will trigger a timing update
a.effect.target = document.createElement("span");
document.documentElement.className = '';
};
</script>
</head>
</html>