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<!DOCTYPE html>
<meta charset="utf-8">
<link rel=author href="mailto:masonf@chromium.org">
<link rel=help href="https://open-ui.org/components/popup.research.explainer">
<link rel=match href="popover-hidden-display-ref.tentative.html">
<meta name=fuzzy content="0-1;0-15">
<div class=nottoplayer popover >This content should be visible and green</div>
<div class=nottoplayer popover=invalid style="top:100px;">This content should be visible and green</div>
<div class=toplayer popover style="top:200px;">This content should be visible and green</div>
<style>
[popover] {
display: block; /* This should make the popover visible */
top: 0;
margin:10px;
width: 300px;
height: 50px;
}
[popover].nottoplayer {
background: green;
}
[popover].toplayer {
background: red;
}
[popover].toplayer:open {
background: green;
}
[popover].nottoplayer:open {
background: red;
}
</style>
<script>
const toplayer = document.querySelectorAll('[popover].toplayer');
if (toplayer.length !== 1)
document.write('FAIL');
toplayer[0].showPopover();
</script>
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