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+<!DOCTYPE html>
+<title>Default namespace respected inside :is() for non-subject compounds</title>
+<link rel="help" href="https://drafts.csswg.org/selectors-4/#matches">
+<link rel="match" href="/css/reference/blank.html">
+<!--
+ Default namespace declarations do not affect the compound selector
+ representing the *subject* of any selector within a :is() pseudo-class, unless
+ that compound selector contains an explicit universal selector or type
+ selector.
+-->
+<style>
+@namespace "http://www.w3.org/1999/xhtml";
+
+*|*.a {
+ display:none;
+}
+
+/* This should not apply, since the '.container' compound is affected by the
+ default namespace (even though the '.a' compound is not). */
+*|*:is(.container .a) {
+ display:initial;
+}
+
+</style>
+<svg xmlns="http://www.w3.org/2000/svg" width="200" height="100">
+ <g class=container>
+ <text class="a" y="1em">FAIL if this text is visible</text>
+ </g>
+</svg>