wpt/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-009.html at master · web-platform-tests/wpt · GitHub

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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Overflow: fixed pos whose containing block is fully before the clamp point gets painted</title>
<link rel="author" title="Andreu Botella" href="mailto:abotella@igalia.com">
<link rel="help" href="https://drafts.csswg.org/css-overflow-4/#line-clamp">
<link rel="match" href="reference/line-clamp-with-abspos-009-ref.html">
<meta name="assert" content="Fixed positioned boxes in a line-clamp container are shown if and only if their fixed positioning containing block precedes or contains the clamp point. In this case, the containing block is fully before the clamp point, so the fixed-pos gets painted.">
<style>
.clamp {
  line-clamp: 4;
  font: 16px / 32px serif;
  padding: 0 4px;
  white-space: pre;
  background-color: yellow;
}
.transformed {
  transform: scale(1); /* Makes it a fixed-pos containing block */
}
.fixed {
  position: fixed;
  top: 0;
  left: 0;
  width: 20px;
  height: 20px;
  background-color: skyblue;
}
</style>
<div class="clamp">Line 1
<div class="transformed"><div class="fixed"></div>Line 2
Line 3</div>Line 4
Line 5</div>