wpt/css/css-contain/contain-paint-022.html at master · web-platform-tests/wpt · GitHub

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<!DOCTYPE html>

  <meta charset="UTF-8">

  <title>CSS Containment Test: 'contain: paint' and absolutely positioned descendants</title>

  <link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/">
  <link rel="help" href="https://www.w3.org/TR/css-contain-1/#containment-paint">
  <link rel="match" href="reference/contain-paint-022-ref.html">

  <meta content="This test checks that paint containment applies to atomic inline elements and then they act as containing block for absolutely positioned descendants." name="assert">

  <link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
  <style>
  div#incorrect-containing-block
    {
      color: transparent;
      font-family: Ahem;
      font-size: 100px;
      height: 2em;
      line-height: 1;
      position: relative;
      width: 2em;
    }

  div#correct-containing-block
    {
      background-color: red;
      contain: paint;
      display: inline-block;
      height: 1em;
      width: 1em;
    }

  div#abspos
    {
      background-color: green;
      height: 1em;
      left: 0;
      position: absolute;
      top: 0;
      width: 1em;
    }
  </style>

  <p>Test passes if there is a filled green square and <strong>no red</strong>.

  <div id="incorrect-containing-block">

  AB C<div id="correct-containing-block">

      <div id="abspos"></div>

    </div>

  </div>