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Test Info:

<html>
<head>
<meta charset="utf8">
<title></title>
<meta name="assert"
content="[The attr() function] can also be used with pseudo-elements,
in which case the attribute's value on the pseudo-element's
originating element is returned.">
<link rel=match href="attr-chained-pseudo-001-ref.html">
<style>
div {
margin-left: 4em;
}
div::after {
content: "World";
display: list-item;
}
div::after::marker {
content: attr(data-mark, "failed ");
color: blue;
}
</style>
</head>
<body>
<p>The line "World" should have "PASS" (in blue) to its left as a list-item marker:</p>
<div data-mark="PASS ">Hello</div>
</body>
</html>