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Test Info:

<!DOCTYPE HTML>
<html class="reftest-wait">
<style type="text/css">
a {
border-bottom: 1px solid transparent;
transition: all 2s linear;
}
a.start {
border-bottom: 1px solid #000000;
}
/* Can be anything, just need to ensure pseudos cascade */
:before {
color: blue;
}
</style>
<a href="http://www.example.com/">example</a>
<script>
let a0 = document.querySelectorAll("a")[0];
a0.classList.add("start");
setTimeout(() => {
a0.classList.remove("start");
setTimeout(() => {
a0.classList.add("start");
document.documentElement.removeAttribute("class");
}, 0);
}, 0);
</script>