mozilla-central/testing/web-platform/tests/css/css-contain/contain-size-064.html

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<!doctype html>
<html lang=en>
<meta charset=utf-8>
<title>CSS-contain test: size containment: layout in place</title>
<link rel="author" title="Florian Rivoal" href="https://florian.rivoal.net">
<meta name=flags content="">
<meta name=assert content="The size containment box's content (including any pseudo-elements) must be laid out into the now fixed-size size containment box normally.">
<link rel="match" href="reference/contain-size-064-ref.html">
<style>
div { font-size: 50px; }
.red { background: red; }
.green { background: green; }
.grid {
display: grid;
grid-template-columns: min-content max-content;
}
#test { contain: size; }
#test::after { content: "\a0" ; }
</style>
<p>This test passes if there are two green rectangles and no red.
<div class=grid>
<div style="grid-area: 1/1">&nbsp;</div>
<div style="grid-area: 1/2"class=red></div><!-- will show if the size containment doesn't result in 0x0-->
<div style="grid-area: 1/3"></div>
<div class=red></div><!-- will show if the size containment doesn't result in 0x0-->
<div id=test class="grid red"><!-- will show if the size containment doesn't result in 0x0-->
<div>&nbsp;</div>
<div class=green></div><!-- won't show unless ::after is inserted and grid tracks are properly sized-->
<div class=green></div><!-- won't show unless ::after is inserted and grid tracks are properly sized-->
</div>
</div>