<!DOCTYPE html>
<link rel="author" title="Mozilla" href="http://www.mozilla.org/">
<link rel="help" href="https://drafts.csswg.org/css-shapes-1/#supported-basic-shapes">
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1758824">

<style>
#a {
  float: right;
  padding: 30em;
  shape-outside: margin-box circle(81% at -1px 0px);
}
</style>
<output>
<shadow id="a">
<svg>
</shadow>
<marquee></marquee>
