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<!doctype html>
<title>inset box shadow works on fieldset</title>
<link rel=author title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
<link rel=author title="Mozilla" href="https://mozilla.org">
<link rel=match href="fieldset-inset-shadow-ref.html">
<style>
fieldset {
width: 100px;
height: 100px;
border: none;
margin: 0;
box-sizing: border-box;
box-shadow: 0 0 0 10px inset black;
}
</style>
<fieldset></fieldset>