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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<!DOCTYPE html>
  p { --foo: purple; background-color: var(--foo) }
  p#myid { --foo: blue }
<p>This should be purple, and might cache background in the rule tree.</p>
<p id="myid">This should be blue, and can't used that cached struct,
which really shouldn't be cached anyway.</p>