File: content-visibility-hidden-with-column-spanner.html

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<!doctype HTML>
<html>
<meta charset="utf8">
<title>CSS Content Visibility: hidden column spanner</title>
<link rel="help" href="https://drafts.csswg.org/css-contain/#content-visibility">
<link rel="match" href="content-visibility-hidden-with-column-spanner-ref.html">
<meta name="assert" content="content-visibility hidden column spanner should stay hidden">
<style>
body {
  width: 600px;
  overflow: hidden;
}
.container {
  column-count: 2;
  width: 200px;
  height: 100px;
}
.spanner {
  column-span: all;
}
</style>
Test fails if you can see text below.
<div class=container>
  <div id=hide_this>
    XXX
    <div class=spanner>PASS if not visible</div>
    XXX
  </div>
</div>
<script>
document.body.offsetHeight;
hide_this.style.contentVisibility = "hidden";
</script>