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Test Info:

<!DOCTYPE HTML>
<title> Ensure block size is same as height of inner div </title>
<link rel="match" href="div-block-size-ref.html">
<style>
#outer {
inset: 0;
background-color: black;
position: absolute;
block-size: fit-content;
inline-size: 100px;
border: 5px solid red;
}
</style>
<div id="outer"><div style="block-size: 200px"></div></div>