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    <title>Performance Tests</title>
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    <h1>Performance Tests</h1>

    <test-description>Testing performance with artificially demanding cases in a real browser</test-description>

    <test-case>
        <test-description>&lt;iframe&gt; element.</test-description>
        <iframe src="performance-frame1.html" allowfullscreen="true" style="width: 100%; height: 200px; border: 1px solid #d8d8d8;"></iframe>
    </test-case>

    <test-case>
        <test-description>&lt;iframe&gt; element containing an &lt;iframe&gt; element inside of an open shadow DOM.</test-description>
        <iframe src="performance-frame2.html" allowfullscreen="true" style="width: 100%; height: 200px; border: 1px solid #d8d8d8;"></iframe>
    </test-case>

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