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<!DOCTYPE html>
<html class="reftest-wait">
<title>CSS Positioned Layout Module Test: 'overlay' rendering on top after transition finished</title>
<link rel="help" href="https://drafts.csswg.org/css-position-4/#overlay">
<link rel="help" href="https://html.spec.whatwg.org/multipage/popover.html">
<link rel="match" href="green-ref.html">
<script src="/common/reftest-wait.js"></script>
<style>
#transition-in, #red {
/* Force display:block both popover open or closed to not rely on
@starting-style or display transitions. */
display: block;
border: none;
width: 100vw;
height: 100vh;
}
#red {
position: fixed;
background-color: red;
}
#transition-in {
transition: overlay 0.1s step-end;
transition-behavior: allow-discrete;
background-color: green;
}
</style>
<div id="transition-in" popover></div>
<div id="red"></div>
<script>
let transition_in = document.querySelector("#transition-in");
transition_in.addEventListener("transitionend", () => takeScreenshot());
// Force style update to have before-change style for overlay transition.
transition_in.offsetTop;
transition_in.showPopover();
if (getComputedStyle(transition_in).overlay != "none") {
// Transition didn't start, force a fail condition.
transition_in.style.backgroundColor = "pink";
takeScreenshot();
}
</script>
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