DXR will be turned off on Tuesday, December 29th. It will redirect to Searchfox.
See the announcement on Discourse.

DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

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<head></head><body><p>Original content</p>
<script>
    window.opener.postMessage("", "*");
    confirm("Message");
    document.write("Extra content");
    window.opener.postMessage(document.documentElement.innerHTML, "*");
</script></body>