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Test Info:

<!DOCTYPE html>
<title>Select element with background color in flexbox with zero height</title>
<link rel="author" title="Mozilla" href="https://mozilla.org">
<link rel="match" href="select-element-zero-height-002-ref.html">
<style>
.container {
display: flex;
flex-direction: column;
height: 0px;
border: 1px dotted black;
}
.with-background {
background: lime;
}
select {
/*
WebKit applies intrinsic (default) margins to control elements in some circumstances,
let's disable them to avoid mismatch errors caused by those margins.
*/
margin: 0;
}
</style>
<body>
<div class="container">
<select class="with-background"><option>Hi</option></select>
</div>
</body>