xml-stylesheet-pi-in-doctype.xhtml

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This WPT test may be referenced by the following Test IDs:
- /css/cssom/xml-stylesheet-pi-in-doctype.xhtml - WPT Dashboard Interop Dashboard

<!DOCTYPE html [<?xml-stylesheet href="data:text/css,html{z-index: 1}"?>]>

<html xmlns="http://www.w3.org/1999/xhtml">

  <head>

    <title>xml-stylesheet processing instruction in doctype internal subset</title>

    <link rel="help" href="https://drafts.csswg.org/cssom/#prolog"/>

    <script src="/resources/testharness.js"></script>

    <script src="/resources/testharnessreport.js"></script>

  </head>

  <body>

    <script>

      promise_test(async () => {

        await new Promise(resolve => window.onload = resolve);

        assert_equals(getComputedStyle(document.documentElement).zIndex, "auto");

});

    </script>

  </body>

</html>