<!DOCTYPE html>
<html>
<title>The :unresolved pseudoclass matching custom tag</title>
<link rel="author" title="Sergey G. Grekhov" href="mailto:sgrekhov@unipro.ru">
<meta name="assert" content="The :unresolved pseudoclass must match all custom elements whose created callback has not yet been invoked">
<link rel="help" href="http://www.w3.org/TR/custom-elements/#unresolved-element-pseudoclass">
<link rel="match" href="unresolved-element-pseudoclass-css-test-custom-tag-ref.html">
<style>
    :unresolved {
        background-color: red;
    }
    body {
        background-color: white;
    }
</style>
<body>
    <p>Test passes if x-element background below is red</p>
    <x-element>
        x-element
    </x-element>
</body>
</html>