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<!DOCTYPE html>
<title>Reference: Select element in flexbox with zero height</title>
<link rel="author" title="Mozilla" href="https://mozilla.org">
<style>
.container {
height: 0px;
border: 1px dotted black;
}
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 style="width:100%"><option>Hi</option></select>
</div>
</body>