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diff --git a/testing/web-platform/tests/html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/window-open-204-fragment.html b/testing/web-platform/tests/html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/window-open-204-fragment.html
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index 0000000000..bb47cd3820
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+++ b/testing/web-platform/tests/html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/window-open-204-fragment.html
@@ -0,0 +1,63 @@
+<!DOCTYPE html>
+<meta charset="UTF-8">
+<title>Fragment navigation on initial empty document created through window.open(url-with-204-response)</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/helpers.js"></script>
+<body></body>
+<script>
+/*
+  When a new window is opened through window.open() it will contain the initial
+  empty document. If the URL parameter is set to the URL that doesn't load a
+  new document (e.g. it results in a HTTP 204 response), it will stay on the
+  initial empty document. If fragment navigations happen, it will still stay on
+  the initial empty document.
+  These tests verify the behavior of navigations that happen on the initial
+  empty document in that situation. They should all be converted to do a
+  replacement.
+*/
+"use strict";
+const url1 = "about:blank#foo";
+const url2 = "resources/code-injector.html?2&pipe=sub(none)&code=" +
+              encodeURIComponent(postMessageToOpenerOnLoad);
+
+promise_test(async t => {
+  // Open a new window with a URL that doesn't load a new document, so it will stay in the initial empty document.
+  const openedWindow = windowOpen204(t);
+
+  // Do a fragment navigation within the initial empty document through setting location.href.
+  // This should do a replacement.
+  openedWindow.location.href = url1;
+  await new Promise(resolve => t.step_timeout(resolve, 100));
+  assert_equals(openedWindow.location.hash, "#foo");
+  assert_equals(openedWindow.history.length, 1,
+    "history.length should not increase after fragment navigation on initial empty document");
+
+  // Navigate away from the initial empty document through setting location.href.
+  // This should do a replacement.
+  openedWindow.location.href = url2;
+  await waitForMessage(t, "loaded");
+  assert_equals(openedWindow.history.length, 1,
+    "history.length should not increase after normal navigation away from initial empty document");
+}, "location.href");
+
+promise_test(async t => {
+  // Open a new window with a URL that doesn't load a new document, so it will stay in the initial empty document.
+  const openedWindow = windowOpen204(t);
+
+  // Do a fragment navigation within the initial empty document through location.assign().
+  // This should do a replacement.
+  openedWindow.location.assign(url1);
+  await new Promise(resolve => t.step_timeout(resolve, 100));
+  assert_equals(openedWindow.location.hash, "#foo");
+  assert_equals(openedWindow.history.length, 1,
+    "history.length should not increase after fragment navigation on initial empty document");
+
+  // Navigate away from the initial empty document through location.assign().
+  // This should do a replacement.
+  openedWindow.location.assign(url2);
+  await waitForMessage(t, "loaded");
+  assert_equals(openedWindow.history.length, 1,
+    "history.length should not increase after normal navigation away from initial empty document");
+}, "location.assign");
+</script>