File: column-style-change-triggers-relayout.html

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<!DOCTYPE html>
<title>CSS Overflow Test: ::column style change triggers relayout</title>
<link rel="help" href="https://www.w3.org/TR/css-multicol-2/#column-pseudo">
<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
<style>
#container {
  scroll-snap-type: both mandatory;
  overflow: hidden;
  columns: 1;
  gap: 0;
  column-fill: auto;
  width: 100px;
  height: 100px;
  background: red;
}
.snapColumns::column {
  scroll-snap-align: start;
}
</style>
<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div id="container">
  <div style="height:100px;"></div>
  <div style="height:100px; background:green;"></div>
</div>
<script>
  document.body.offsetTop;
  container.className = "snapColumns";
  container.scrollLeft = 51;
</script>