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diff --git a/testing/web-platform/tests/css/cssom/CSSStyleSheet-constructable-insertRule-base-uri.html b/testing/web-platform/tests/css/cssom/CSSStyleSheet-constructable-insertRule-base-uri.html
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+++ b/testing/web-platform/tests/css/cssom/CSSStyleSheet-constructable-insertRule-base-uri.html
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+<!doctype html>
+<meta charset="utf-8">
+<title>CSSStyleSheet.insertRule() on a constructable stylesheet uses the right base uri, even if replace/Sync() hasn't been called yet</title>
+<link rel="author" href="https://mozilla.org" title="Mozilla">
+<link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">
+<link rel="help" href="https://drafts.csswg.org/cssom/">
+<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1880718">
+<link rel="match" href="CSSStyleSheet-constructable-insertRule-base-uri-ref.html">
+<script>
+ const sheet = new CSSStyleSheet();
+ sheet.insertRule(`
+ :root {
+ background-image: url("../../images/green.png");
+ }
+ `);
+ document.adoptedStyleSheets.push(sheet);
+</script>