<!DOCTYPE html>
<meta charset="utf-8">
<link rel="author" title="Daniel Holbert" href="mailto:dholbert@mozilla.com">
<link rel="author" title="Ting-Yu Lin" href="mailto:tlin@mozilla.com">
<link rel="author" title="Mozilla" href="https://www.mozilla.org/">
<link rel="help" href="https://drafts.csswg.org/css-break/#break-decoration">
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1693616">
<meta name="assert" content="This test verifies that a block element with box-decoration-break:clone, whose block-start border and padding exceed the multicol's height, can make progress when fragmenting without hanging the browser.">

<style>
#a {
  column-count: 2;
}
#b {
  box-decoration-break: clone;
  padding: 4px 0px;
  border: 1px dotted black;
}
* {
  height: 19%;
}
</style>
Hopefully this doesn't hang.
<div id="a">
<div id="b">
