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diff --git a/dom/l10n/tests/mochitest/l10n_overlays/test_title.html b/dom/l10n/tests/mochitest/l10n_overlays/test_title.html
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index 0000000000..4571589b8e
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+++ b/dom/l10n/tests/mochitest/l10n_overlays/test_title.html
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+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Test L10nOverlays Special treatment of the title element</title>
+  <script type="application/javascript" 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">
+  /* global L10nOverlays */
+  "use strict";
+
+  function elem(name) {
+    return function(str) {
+      const element = document.createElement(name);
+      // eslint-disable-next-line no-unsanitized/property
+      element.innerHTML = str;
+      return element;
+    };
+  }
+
+  const { translateElement } = L10nOverlays;
+
+  {
+    // Text is fine.
+    const element = elem("title")``;
+    const translation = {
+      value: 'Text',
+      attributes: null,
+    };
+
+    translateElement(element, translation);
+    is(
+      element.innerHTML,
+      'Text'
+    );
+  }
+
+  {
+    // Markup is ignored.
+    const element = elem("title")``;
+    const translation = {
+      value: '<em>Markup</em>',
+      attributes: null,
+    };
+
+    translateElement(element, translation);
+    is(
+      element.textContent,
+      '<em>Markup</em>'
+    );
+    is(
+      element.innerHTML,
+      '&lt;em&gt;Markup&lt;/em&gt;'
+    );
+  }
+  </script>
+</head>
+<body>
+</body>
+</html>