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Test Info:

<!DOCTYPE html>
<link rel="author" title="David Shin" href="mailto:dshin@mozilla.com">
<link rel="match" href="align-self-with-flex-grid-parent-ref.html">
<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;
}
.inner {
width: 30px;
height: 30px;
margin-left: 270px;
}
.flex {
display: flex;
}
.grid {
display: grid;
}
.abs {
position: absolute;
width: 100px;
height: 100px;
inset: 0;
/* Should align to the center of .container. */
align-self: center;
justify-self: center;
background: pink;
}
</style>
<div class="container">
<div class="inner flex">
<div class="abs"></div>
</div>
</div>
<br>
<div class="container">
<div class="inner grid">
<div class="abs"></div>
</div>
</div>