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Test Info:

<!DOCTYPE html>
<link rel="author" title="Tim Nguyen" href="https://github.com/nt1m">
<link rel="match" href="fit-content-block-size-fixedpos-ref.html">
<style>
#container {
height: fit-content;
position: fixed;
top: 50%;
background-color: gold;
margin: auto;
bottom: 0;
}
</style>
<div id="container">
<div style="height:90vh;width:50px;outline: 2px dotted red;"></div>
</div>