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+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Login Manager: Related Realms</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="../../../satchel/test/satchel_common.js"></script>
+  <script type="text/javascript" src="pwmgr_common.js"></script>
+  <link rel="stylesheet" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<p id="display"></p>
+<div id="content"></div>
+<pre id="test">
+Testing related realms
+
+Related realms is feature to provide login suggestion based on similar domains.
+
+Out of the scope of this feature is subdomain handling, which is already part
+of the base functionality. The intent is to cover the ebay.com/ebay.co.uk and
+all other country TLD cases where the sign in page is actually
+signin.ebay.com/signin.ebay.co.uk but credentials could have manually been
+entered for ebay.com/ebay.co.uk or automatically stored as
+signin.ebay.com/sigin.ebay.co.uk
+
+The related realms feature can be enabled via the preference
+signon.relatedRealms.enabled. It is disabled by default.
+
+This test proves that related logins show up in the autocomplete menu when
+the feature is enabled and that the related logins do not count as duplicates
+and therefore the form gets filled directly.
+
+<template id="form1-template">
+  <form id="form1" action="https://www.example.com">
+    <input type="text" name="uname">
+    <input type="password" name="pword">
+  </form>
+</template>
+
+<script class="testbody" type="text/javascript">
+  const formTemplate = document.getElementById("form1-template");
+
+  add_setup(async () => {
+    await setStoredLoginsDuringTest(
+      ["https://example.com", "https://example.com", null, "example.com-user", "password", "uname", "pword"],
+
+      // Related domain relationship where example.com and other-example.com are in the related domains list
+      ["https://other-example.com", "https://other-example.com", null, "other-example.com-user", "password", "uname", "pword"],
+
+      // example.com and example.co.uk are related, so sub.example.co.uk is also related
+      ["https://sub.example.co.uk", "https://sub.example.co.uk", null, "sub.example.co.uk-user", "password", "uname", "pword"],
+
+      // www subdomain on same TLD
+      ["https://www.example.com", "https://www.example.com", null, "www.example.com-user", "password", "uname", "pword"],
+
+      // other subdomain on same TLD
+      ["https://sub.example.com", "https://sub.example.com", null, "sub.example.com-user", "password", "uname", "pword"],
+    );
+  });
+
+  add_named_task("with relatedRealms disabled, related logins do not show up in autocomplete menu", async () => {
+    await setPreferencesForTask(["signon.relatedRealms.enabled", false]);
+
+    const form = setContentForTask(formTemplate);
+
+    const autofillResult = await formAutofillResult(form.id);
+    is(autofillResult, "filled", "form has been filled");
+
+    // reset the form and open autocomplete popup by focusing username input
+    form.reset();
+    const results = await popupBy(() => form.uname.focus());
+    checkAutoCompleteResults(results, [
+      "example.com-user",
+      "sub.example.com-user",
+      "www.example.com-user",
+    ], window.location.host, "all logins are present and in order");
+  });
+
+  add_named_task("with relatedRealms enabled, related logins show up in autocomplete menu", async () => {
+    await setPreferencesForTask(["signon.relatedRealms.enabled", true]);
+
+    const form = setContentForTask(formTemplate);
+
+    const result = await formAutofillResult(form.id);
+    is(result, "filled", "form has been filled");
+
+    // reset the form and open autocomplete popup by focusing username input
+    form.reset();
+    const results = await popupBy(() => form.uname.focus());
+    checkAutoCompleteResults(results, [
+      "example.com-user",
+      "other-example.com-user",
+      "sub.example.co.uk-user",
+      "sub.example.com-user",
+      "www.example.com-user",
+    ], window.location.host, "all logins are present and in order");
+  });
+
+  add_named_task("even with relatedRealms enabled, related logins are not considered duplicates, so form will be filled", async () => {
+    await setPreferencesForTask(["signon.relatedRealms.enabled", true]);
+
+    const form = setContentForTask(formTemplate);
+
+    const autofillResult = await formAutofillResult(form.id);
+    is(autofillResult, "filled", "form has been filled");
+
+    is(form.uname.value, "example.com-user", "username from exact tld is filled in");
+  });
+</script>
+</pre>
+</body>
+</html>