wpt/css/css-contain/contain-size-064.html at master · web-platform-tests/wpt · GitHub

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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">
  <link rel=help href="https://drafts.csswg.org/css-contain-1/#containment-size">

<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>