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<!DOCTYPE html>
<meta charset="utf-8" />
<style>
div {
position: absolute;
writing-mode: vertical-lr;
font: 250px serif, Noto Color Emoji;
}
#mask {
color: transparent;
background: green;
}
</style>
<p>The emoji glyph should not be visible outside the green box:</p>
<div id="mask">.🐀.</div>