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<!DOCTYPE html>
<link rel="author" title="David Shin" href="mailto:dshin@mozilla.com">
<meta name="assert" content="Ensures that absolutely positioned elements with non-auto inset are w.r.t. absolute contain block.">
<style>
.container {
position: relative;
width: 300px;
height: 300px;
background: purple;
}
.abs {
position: absolute;
width: 100px;
height: 100px;
inset: 0;
align-self: center;
justify-self: center;
background: pink;
}
</style>
<div class="container">
<div class="abs"></div>
</div>
<br>
<div class="container">
<div class="abs"></div>
</div>