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diff --git a/dom/base/test/jsmodules/importmaps/test_sortedImportMap.html b/dom/base/test/jsmodules/importmaps/test_sortedImportMap.html
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+++ b/dom/base/test/jsmodules/importmaps/test_sortedImportMap.html
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+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Test a sorted import map</title>
+
+<!--
+According to Import maps spec, the entries in "imports" and "scopes" need to be
+sorted. Key with longest prefix should be chosen. So "a/b/" should take
+precendence over "a/".
+This test is verifying that requirement.
+
+In "imports" below, "scope1/scope2/" and "scope1/scope2/scope3/scope4/" should
+be chosen over "scope1" and "scope1/scope2/scop3/" respectively.
+Also "scope1/scope2/" is listed _after_ "scope1/ and
+"scope1/scope2/scope3/scope4" is listed _before_ "scope1/scope2/scope3/" to make
+sure the map is sorted.
+
+For "scopes" below, the "scope1/" is listed before "scope1/scope2/" in
+test_simpleImportMap.html, here we reverse the order, for example, we list
+"scope1/" after "scope1/scope2/" in this test.
+
+See:
+https://html.spec.whatwg.org/multipage/webappapis.html#sorting-and-normalizing-a-module-specifier-map, Step 3.
+https://html.spec.whatwg.org/multipage/webappapis.html#sorting-and-normalizing-scopes, Step 3.
+-->
+
+<script type="importmap">
+{
+  "imports": {
+    "scope1/": "/content/chrome/dom/base/test/jsmodules/importmaps/",
+    "scope1/scope2/": "/content/chrome/dom/base/test/jsmodules/importmaps/scope1/scope2/",
+    "scope1/scope2/scope3/scope4/": "/content/chrome/dom/base/test/jsmodules/importmaps/scope1/scope2/",
+    "scope1/scope2/scope3/": "/content/chrome/dom/base/test/jsmodules/importmaps/"
+  },
+  "scopes": {
+    "chrome://mochitests/content/chrome/dom/base/test/jsmodules/importmaps/scope1/scope2/": {
+      "simple": "/content/chrome/dom/base/test/jsmodules/importmaps/scope1/scope2/module_simpleExport.mjs"
+    },
+    "chrome://mochitests/content/chrome/dom/base/test/jsmodules/importmaps/scope1/": {
+      "simple": "/content/chrome/dom/base/test/jsmodules/importmaps/scope1/module_simpleExport.mjs"
+    }
+  }
+}
+</script>
+
+<script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+
+<script>
+  var sorted_result, sorted_result2;
+  var result_scope2;
+
+  SimpleTest.waitForExplicitFinish();
+
+  function testLoaded() {
+    ok(sorted_result == 126, 'Check imported value sorted_result: ' + sorted_result);
+    ok(sorted_result2 == 126, 'Check imported value sorted_result: ' + sorted_result2);
+    ok(result_scope2 == 126, 'Check imported value result_scope2: ' + result_scope2);
+    SimpleTest.finish();
+  }
+</script>
+<script type="module" src="module_sortedImportMap.mjs"></script>
+<script type="module" src="scope1/scope2/module_simpleImportMap.mjs"></script>
+<body onload='testLoaded()'></body>