wpt/css/css-overflow/line-clamp/webkit-line-clamp-048.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: -webkit-line-clamp display invalidation test</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/webkit-line-clamp-001-ref.html">
<meta name="assert" content="-webkit-line-clamp needs a specified value of `display: -webkit-box`, but the computed value is set to `display: flow-root`. This test checks that changing the specified value from `-webkit-box` to `flow-root` makes the box no longer a line-clamp container.">
<script src="/common/reftest-wait.js"></script>
<style>
.clamp {
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 4;
  overflow: hidden; /* can be removed once implementations update their old -webkit-line-clamp implementations */
  font: 16px / 32px serif;
  white-space: pre;
  background-color: yellow;
}
</style>
<div class="clamp">Line 1
Line 2
Line 3
Line 4
Line 5</div>

<script>
  requestAnimationFrame(() => {
    requestAnimationFrame(() => {
      // When `display: -webkit-box` is present with -webkit-line-clamp, its
      // computed value becomes `display: flow-root`, but the -webkit-line-clamp
      // behavior needs `-webkit-box` as the specified value.
      const clampEl = document.querySelector(".clamp");
      clampEl.style.display = getComputedStyle(clampEl).display;
      takeScreenshot();
    });
  });
</script>