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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Flexbox: an empty editable flex container reserves a line's block size in a vertical writing mode</title>
<style>
#target {
width: 20px;
height: 100px;
margin: 0;
background: green;
}
</style>
<p>Test passes if there is a filled green rectangle below and no red.</p>
<div id="target"></div>