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diff --git a/testing/web-platform/tests/html/semantics/document-metadata/the-base-element/base_about_blank.html b/testing/web-platform/tests/html/semantics/document-metadata/the-base-element/base_about_blank.html
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+++ b/testing/web-platform/tests/html/semantics/document-metadata/the-base-element/base_about_blank.html
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+<!doctype html>
+<meta charset=utf-8>
+<title>base element in about:blank document should resolve against its fallback base URI</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<iframe></iframe>
+<script>
+var t = async_test();
+addEventListener("load", t.step_func_done(function() {
+ var doc = frames[0].document;
+ var b = doc.createElement("base");
+ b.setAttribute("href", "test");
+ var newBaseValue = location.href.replace(/\/[^/]*$/, "/") + "test";
+ assert_equals(b.href, newBaseValue);
+ assert_equals(doc.baseURI, location.href);
+ doc.head.appendChild(b);
+ assert_equals(doc.baseURI, newBaseValue);
+}));
+</script>