testing/web-platform/tests/conformance-checkers/xhtml/elements/base/001-novalid.xhtml


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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<base/>
<title>base element missing href and target attribute</title>
</head>
<body>
<iframe sandbox="aLLOw-TOp-nAVIGAtion"></iframe>
</body>
</html>