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Test Info:

<!DOCTYPE html>
<meta charset="utf-8">
<link rel="author" title="Ting-Yu Lin" href="mailto:tlin@mozilla.com">
<link rel="author" title="Mozilla" href="https://www.mozilla.org">
<link rel="match" href="../../reference/ref-filled-green-100px-square.xht">
<meta name="assert" content="This test verifies that the sticky flex item reserves its in-flow space in the scroll container's overflow area.">
<style>
#scroller {
overflow: hidden;
inline-size: 100px;
block-size: 100px;
background-color: green;
}
#flex {
display: flex;
flex-direction: column;
/* Use a small block-size so that the flex items overflow the flex container.
It's necessary to trigger the bug. */
block-size: 10px;
}
#non-sticky {
flex: 0 0 80px;
background-color: red;
}
#sticky {
position: sticky;
flex: 0 0 100px;
bottom: 0;
}
</style>
<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div id="scroller">
<div id="flex">
<div id="non-sticky"></div>
<div id="sticky"></div>
</div>
</div>
<script>
// Scroll the scroll container down to the bottom.
document.getElementById("scroller").scrollTop="1000";
</script>