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diff --git a/dom/l10n/tests/mochitest/dom_localization/test_repeated_l10nid.html b/dom/l10n/tests/mochitest/dom_localization/test_repeated_l10nid.html
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+++ b/dom/l10n/tests/mochitest/dom_localization/test_repeated_l10nid.html
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+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Test DOMLocalization's matching l10nIds functionality</title>
+  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css">
+  <script type="application/javascript">
+  "use strict";
+  const l10nReg = new L10nRegistry();
+  const fs = [
+    { path: "/localization/en-US/mock.ftl", source: `
+key1 = Translation For Key 1
+
+key2 = Visit <a data-l10n-name="link">this link<a/>.
+` },
+  ];
+  const source = L10nFileSource.createMock("test", "app", ["en-US"], "/localization/{locale}", fs);
+  l10nReg.registerSources([source]);
+
+  SimpleTest.waitForExplicitFinish();
+  addLoadEvent(async () => {
+    const domLoc = new DOMLocalization(
+      ["/mock.ftl"],
+      false,
+      l10nReg,
+      ["en-US"],
+    );
+
+    await domLoc.translateFragment(document.body);
+
+    ok(document.querySelector("#elem1").textContent.includes("Key 1"));
+    ok(document.querySelector("#elem2").textContent.includes("Key 1"));
+
+    const elem3 = document.querySelector("#elem3");
+    const elem4 = document.querySelector("#elem4");
+
+    ok(elem3.textContent.includes("Visit"));
+    is(elem3.querySelector("a").getAttribute("href"), "http://www.mozilla.org");
+
+    ok(elem4.textContent.includes("Visit"));
+    is(elem4.querySelector("a").getAttribute("href"), "http://www.firefox.com");
+
+    SimpleTest.finish();
+  });
+  </script>
+</head>
+<body>
+  <h1 id="elem1" data-l10n-id="key1"></h1>
+  <h2 id="elem2" data-l10n-id="key1"></h2>
+
+  <p id="elem3" data-l10n-id="key2">
+    <a href="http://www.mozilla.org" data-l10n-name="link"></a>
+  </p>
+
+  <p id="elem4" data-l10n-id="key2">
+    <a href="http://www.firefox.com" data-l10n-name="link"></a>
+  </p>
+</body>
+</html>