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<!doctype html>
<meta charset="utf-8">
<title>Tests that after making a button a containing block, dynamically-inserted abspos boxes still get positioned correctly</title>
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1740439">
<link rel="help" href="https://drafts.csswg.org/css-position/#abspos-insets">
<link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">
<link rel="author" href="https://mozilla.org" title="Mozilla">
<link rel="match" href="containing-block-change-button-ref.html">
<style>
#button {
width: 400px;
height: 400px;
margin: 100px;
background-color: purple;
border: 0;
padding: 10px;
}
#button > div {
position: absolute;
width: 100px;
height: 100px;
background-color: green;
/* Vertically centered to match in-flow button layout of the reference */
top: 150px;
left: 0;
}
</style>
<button id="button"></button>
<script>
let button = document.getElementById("button");
button.getBoundingClientRect();
button.style.position = "relative";
button.getBoundingClientRect();
button.appendChild(document.createElement("div"));
</script>
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