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chromium/third_party/blink/web_tests/external/wpt/css/css-tables/border-collapse-double-border.html 

<!doctype html>
<title>CSS Test: border-collapsed tables don't unconditionally render double borders as solid</title>
<link rel="author" href="mailto:[email protected]" title="Emilio Cobos Álvarez">
<link rel="author" href="https://mozilla.org" title="Mozilla">
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1521066">
<link rel="help" href="https://drafts.csswg.org/css2/tables.html#collapsing-borders">
<link rel="mismatch" href="border-collapse-double-border-notref.html">
<table style="border-collapse: collapse; border-style: double;">
  <td>Should see a non-solid border</td>
</table>