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Test Info:

<!DOCTYPE html>
<style>
div {
margin: 10px;
width: 2ic;
height: 1ic;
background: blue;
/* Examples of Windows and macOS fonts that include vertical metrics: */
font: 20px Yu Gothic, Yu Mincho, SimSun, Meiryo, Hiragino Sans, STSong, sans-serif;
}
#test {
writing-mode: vertical-rl;
}
</style>
<p>Both blocks should be the same size:</p>
<div></div>
<div id=test></div>