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<!doctype html>
<title>z-index doesn't apply to transformed content which is not positioned</title>
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
<link rel="author" title="Mozilla" href="https://mozilla.org">
<link rel="match" href="z-index-does-not-apply-ref.html">
<style>
#a, #b {
background: green;
width: 100px;
height: 100px;
}
#a {
background: red;
z-index: 2;
transform: translateX(0);
}
#b {
z-index: 1;
transform: translateY(-100px);
}
</style>
<div id="a"></div>
<div id="b"></div>