wpt/css/css-overflow/line-clamp/block-ellipsis-repaint-003.html at master · web-platform-tests/wpt · GitHub

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<!DOCTYPE html>
<html class="reftest-wait">
<meta charset="utf-8">
<title>CSS Overflow: line-clamp ellipsis repaint tests</title>
<link rel="author" title="Andreu Botella" href="mailto:abotella@igalia.com">
<link rel="help" href="https://drafts.csswg.org/css-overflow-4/#block-ellipsis">
<link rel="match" href="reference/block-ellipsis-repaint-003-ref.html">
<meta name="assert" content="This test makes sure that, if the line with the ellipsis gets moved vertically because the height of previous lines grows, the ellipsis moves correspondingly; and that this happens even when the height of the line-clamp container does not change. This is the case even if the ellipsis completely displaces the line it's in.">
<script src="/common/reftest-wait.js"></script>
<style>
.clamp {
  line-clamp: 2;
  border: 1px solid black;
  padding: 4px;
  background-color: yellow;
  height: 3lh;
  width: 400px;

  position: relative;
  z-index: 0;
}
#abspos {
  position: absolute;
  top: calc(1lh + 4px);
  left: 4px;
  height: 1lh;
  width: 2em;

  background-color: pink;
  z-index: -1;
}
#line1 {
  line-height: 2lh;
}
#wide-atomic {
  display: inline-block;
  width: 500px;
}
</style>

<p>The ellipsis should appear inside the pink box.</p>

<div class="clamp">
  <div id="abspos"></div>
  <span id="line1">Line 1</span> <br>
  <span id="wide-atomic"></span>
  Line 2
</div>

<script>
  window.onload = () => {
    requestAnimationFrame(() => {
      requestAnimationFrame(() => {
        document.getElementById("line1").style.lineHeight = "initial";
        takeScreenshot();
      });
    });
  };
</script>