testing/web-platform/tests/css/css-contain/contain-paint-ignored-cases-ruby-stacking-and-clipping-001.html


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<!doctype html>
<html lang=en>
  <head>
    <meta charset=utf-8>
    <title>CSS-contain test: paint containment on internal ruby elements.</title>
    <link rel="author" title="Yusuf Sermet" href="mailto:ysermet@mozilla.com">
    <link rel="help" href="https://drafts.csswg.org/css-contain/#containment-paint">
    <link rel="match" href="contain-paint-ignored-cases-ruby-stacking-and-clipping-001-ref.html">
    <meta name="assert" content="Paint containment should not apply to ruby base, ruby base container, ruby text, and ruby text container. This test confirms that contain:paint does not create a stacking context and does not apply overflow clipping.">
    <style>
      div {
        position: relative;
      }
      rb,
      rbc,
      rt,
      rtc {
        contain: paint;
      }
      rbc {
        display: ruby-base-container;
      }
      .contained {
        z-index: 5;
        width: 70px;
        height: 10px;
        background-color: blue;
        margin-left: -25px;
      }
      .background {
        background-color: yellow;
        height: 50px;
        width: 50px;
        position: fixed;
        z-index: 2;
      }
      .group {
        display: inline-block;
      }
    </style>
  </head>
  <body>
    <div class="group">
      <div class="background"></div>
      <ruby><rb>&emsp;<div class="contained"></div></rb></ruby>
    </div>
    <div class="group">
      <div class="background"></div>
      <ruby><rbc>&emsp;<div class="contained"></div></rbc></ruby>
    </div>
    <div class="group">
      <div class="background"></div>
      <ruby><rt>&emsp;<div class="contained"></div></rt></ruby>
    </div>
    <div class="group">
      <div class="background"></div>
      <ruby><rtc>&emsp;<div class="contained"></div></rtc></ruby>
    </div>
  </body>
</html>