2 files changed, 15 insertions, 21 deletions
diff --git a/dom/tests/mochitest/webcomponents/chrome.toml b/dom/tests/mochitest/webcomponents/chrome.toml
index b29df619c4..5db7f14a37 100644
--- a/dom/tests/mochitest/webcomponents/chrome.toml
+++ b/dom/tests/mochitest/webcomponents/chrome.toml
@@ -1,7 +1,7 @@
 [DEFAULT]
 support-files = ["dummy_page.html"]
 
-["test_custom_element_ensure_custom_element.html"]
+["test_custom_element_auto_import.html"]
 
 ["test_custom_element_htmlconstructor_chrome.html"]
 support-files = [
diff --git a/dom/tests/mochitest/webcomponents/test_custom_element_ensure_custom_element.html b/dom/tests/mochitest/webcomponents/test_custom_element_auto_import.html
index 03ed2e3815..2371600677 100644
--- a/dom/tests/mochitest/webcomponents/test_custom_element_ensure_custom_element.html
+++ b/dom/tests/mochitest/webcomponents/test_custom_element_auto_import.html
@@ -1,11 +1,8 @@
 <!DOCTYPE HTML>
 <html lang="en">
-  <!--
-    https://bugzilla.mozilla.org/show_bug.cgi?id=1813077
-  -->
 <head>
   <meta charset="utf-8">
-  <title>Test for customElements.ensureCustomElement</title>
+  <title>Test for custom element auto import behavior</title>
   <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
   <link rel="stylesheet" href="chrome://mochikit/content/tests/SimpleTest/test.css"/>
   <script>
@@ -14,36 +11,33 @@
     outside of the task that imported them. This can create issues if writing
     another test in this file.
     */
-    add_task(async function test_ensure_custom_elements() {
+    add_task(async function test_custom_elements_auto_import() {
       let registry = SpecialPowers.wrap(customElements);
-      ok(window.ensureCustomElements, "should be defined");
 
       // Ensure the custom elements from ESModules are not defined.
       is(registry.get("moz-button-group"), undefined, "moz-button-group should be undefined since we have not yet imported it");
       is(registry.get("moz-support-link"), undefined, "moz-support-link should be undefined since we have not yet imported it");
       is(registry.get("moz-toggle"), undefined, "moz-toggle should be undefined since we have not yet imported it");
 
-      // Import a single custom element and assert it exists in the custom
-      // element registry
-      let modules = await window.ensureCustomElements("moz-support-link");
-      ok(registry.get("moz-support-link"), "moz-support-link should be defined after importing it");
-      is(modules, null, "There should not be a return value when using ensureCustomElements");
+      // Create a custom element and assert that it gets imported/defined.
+      document.createElement("moz-support-link");
+      ok(registry.get("moz-support-link"), "moz-support-link should be defined after creation");
 
-      // Import multiple custom elements and assert they exist in the registry
-      modules = undefined;
+      // Create multiple custom elements and assert they exist in the registry.
       is(registry.get("moz-button-group"), undefined, "moz-button-group should be undefined since we have not yet imported it");
       is(registry.get("moz-toggle"), undefined, "moz-toggle should be undefined since we have not yet imported it")
-      modules = await window.ensureCustomElements("moz-toggle", "moz-button-group");
-      is(modules, null, "There should not be a return value when using ensureCustomElements");
+      
+      document.createElement("moz-button-group");
+      document.createElement("moz-toggle");
+
       ok(registry.get("moz-toggle"), "moz-toggle should be defined after importing it");
       ok(registry.get("moz-button-group"), "moz-button-group should be defined after importing it");
 
-      // Ensure there are no errors if the imported elements are imported
-      // again
-      modules = undefined;
-      modules = await window.ensureCustomElements("moz-support-link", "moz-toggle", "moz-button-group");
+      // Ensure there are no errors if the imported elements are created again.
+      document.createElement("moz-support-link");
+      document.createElement("moz-button-group");
+      document.createElement("moz-toggle");
       ok(true, "The custom elements should not throw an error if imported again");
-      is(modules, null, "There should not be a return value when using ensureCustomElements");
     })
   </script>
 </head>