From 5f8de423f190bbb79a62f804151bc24824fa32d8 Mon Sep 17 00:00:00 2001
From: "Matt A. Tobin" <mattatobin@localhost.localdomain>
Date: Fri, 2 Feb 2018 04:16:08 -0500
Subject: Add m-esr52 at 52.6.0

---
 dom/base/test/jsmodules/chrome.ini                 | 51 ++++++++++++++
 .../test/jsmodules/iframe_extractIntroType.html    | 14 ++++
 dom/base/test/jsmodules/mochitest.ini              |  5 ++
 dom/base/test/jsmodules/module_badImport.js        |  1 +
 dom/base/test/jsmodules/module_badSyntax.js        |  3 +
 dom/base/test/jsmodules/module_cyclic1.js          |  7 ++
 dom/base/test/jsmodules/module_cyclic2.js          |  7 ++
 dom/base/test/jsmodules/module_cyclic3.js          |  7 ++
 dom/base/test/jsmodules/module_extractIntroType.js |  5 ++
 dom/base/test/jsmodules/module_large1.js           | 78 ++++++++++++++++++++++
 dom/base/test/jsmodules/module_large2.js           | 78 ++++++++++++++++++++++
 dom/base/test/jsmodules/module_large3.js           | 78 ++++++++++++++++++++++
 dom/base/test/jsmodules/module_missingImport.js    |  1 +
 dom/base/test/jsmodules/module_multiImports.js     |  4 ++
 .../test/jsmodules/module_multiLargeImports.js     |  4 ++
 dom/base/test/jsmodules/module_setRan.js           |  2 +
 dom/base/test/jsmodules/module_simple1.js          |  1 +
 dom/base/test/jsmodules/module_simple2.js          |  1 +
 dom/base/test/jsmodules/module_simple3.js          |  1 +
 dom/base/test/jsmodules/module_simpleExport.js     |  1 +
 dom/base/test/jsmodules/module_simpleImport.js     |  2 +
 dom/base/test/jsmodules/module_testSyntax.js       |  3 +
 dom/base/test/jsmodules/moz.build                  | 13 ++++
 dom/base/test/jsmodules/script_simple2.js          |  1 +
 .../test/jsmodules/test_asyncInlineModules.html    | 36 ++++++++++
 dom/base/test/jsmodules/test_cyclicImport.html     | 18 +++++
 dom/base/test/jsmodules/test_importIntroType.html  | 22 ++++++
 dom/base/test/jsmodules/test_importNotFound.html   | 27 ++++++++
 .../test/jsmodules/test_importResolveFailed.html   | 21 ++++++
 .../jsmodules/test_importedModuleMemoization.html  | 30 +++++++++
 .../test/jsmodules/test_linkErrorInCommon1.html    | 32 +++++++++
 .../test/jsmodules/test_linkErrorInCommon2.html    | 32 +++++++++
 dom/base/test/jsmodules/test_moduleNotFound.html   | 24 +++++++
 .../test/jsmodules/test_moduleParsedAsModule.html  | 23 +++++++
 .../test/jsmodules/test_moduleScriptsNotRun.html   | 19 ++++++
 dom/base/test/jsmodules/test_moduleScriptsRun.html | 19 ++++++
 .../test/jsmodules/test_multiAsyncImports.html     | 30 +++++++++
 .../test/jsmodules/test_multiModuleImports.html    | 28 ++++++++
 .../jsmodules/test_multiModuleLargeImports.html    | 28 ++++++++
 .../test/jsmodules/test_multiTopLevelImports.html  | 30 +++++++++
 .../jsmodules/test_multiTopLevelLargeImports.html  | 30 +++++++++
 .../test/jsmodules/test_scriptInsertedModule.html  | 20 ++++++
 .../test/jsmodules/test_scriptModuleOrder.html     | 30 +++++++++
 .../jsmodules/test_scriptNotParsedAsModule.html    | 23 +++++++
 dom/base/test/jsmodules/test_simpleImport.html     | 16 +++++
 dom/base/test/jsmodules/test_syntaxError.html      | 23 +++++++
 dom/base/test/jsmodules/test_syntaxErrorAsync.html | 23 +++++++
 .../test/jsmodules/test_syntaxErrorInline.html     | 27 ++++++++
 .../jsmodules/test_syntaxErrorInlineAsync.html     | 27 ++++++++
 .../test/jsmodules/test_topLevelIntroType.html     | 21 ++++++
 .../jsmodules/test_toplevelModuleMemoization.html  | 30 +++++++++
 .../jsmodules/test_typeAttrCaseInsensitive.html    | 19 ++++++
 52 files changed, 1076 insertions(+)
 create mode 100644 dom/base/test/jsmodules/chrome.ini
 create mode 100644 dom/base/test/jsmodules/iframe_extractIntroType.html
 create mode 100644 dom/base/test/jsmodules/mochitest.ini
 create mode 100644 dom/base/test/jsmodules/module_badImport.js
 create mode 100644 dom/base/test/jsmodules/module_badSyntax.js
 create mode 100644 dom/base/test/jsmodules/module_cyclic1.js
 create mode 100644 dom/base/test/jsmodules/module_cyclic2.js
 create mode 100644 dom/base/test/jsmodules/module_cyclic3.js
 create mode 100644 dom/base/test/jsmodules/module_extractIntroType.js
 create mode 100644 dom/base/test/jsmodules/module_large1.js
 create mode 100644 dom/base/test/jsmodules/module_large2.js
 create mode 100644 dom/base/test/jsmodules/module_large3.js
 create mode 100644 dom/base/test/jsmodules/module_missingImport.js
 create mode 100644 dom/base/test/jsmodules/module_multiImports.js
 create mode 100644 dom/base/test/jsmodules/module_multiLargeImports.js
 create mode 100644 dom/base/test/jsmodules/module_setRan.js
 create mode 100644 dom/base/test/jsmodules/module_simple1.js
 create mode 100644 dom/base/test/jsmodules/module_simple2.js
 create mode 100644 dom/base/test/jsmodules/module_simple3.js
 create mode 100644 dom/base/test/jsmodules/module_simpleExport.js
 create mode 100644 dom/base/test/jsmodules/module_simpleImport.js
 create mode 100644 dom/base/test/jsmodules/module_testSyntax.js
 create mode 100644 dom/base/test/jsmodules/moz.build
 create mode 100644 dom/base/test/jsmodules/script_simple2.js
 create mode 100644 dom/base/test/jsmodules/test_asyncInlineModules.html
 create mode 100644 dom/base/test/jsmodules/test_cyclicImport.html
 create mode 100644 dom/base/test/jsmodules/test_importIntroType.html
 create mode 100644 dom/base/test/jsmodules/test_importNotFound.html
 create mode 100644 dom/base/test/jsmodules/test_importResolveFailed.html
 create mode 100644 dom/base/test/jsmodules/test_importedModuleMemoization.html
 create mode 100644 dom/base/test/jsmodules/test_linkErrorInCommon1.html
 create mode 100644 dom/base/test/jsmodules/test_linkErrorInCommon2.html
 create mode 100644 dom/base/test/jsmodules/test_moduleNotFound.html
 create mode 100644 dom/base/test/jsmodules/test_moduleParsedAsModule.html
 create mode 100644 dom/base/test/jsmodules/test_moduleScriptsNotRun.html
 create mode 100644 dom/base/test/jsmodules/test_moduleScriptsRun.html
 create mode 100644 dom/base/test/jsmodules/test_multiAsyncImports.html
 create mode 100644 dom/base/test/jsmodules/test_multiModuleImports.html
 create mode 100644 dom/base/test/jsmodules/test_multiModuleLargeImports.html
 create mode 100644 dom/base/test/jsmodules/test_multiTopLevelImports.html
 create mode 100644 dom/base/test/jsmodules/test_multiTopLevelLargeImports.html
 create mode 100644 dom/base/test/jsmodules/test_scriptInsertedModule.html
 create mode 100644 dom/base/test/jsmodules/test_scriptModuleOrder.html
 create mode 100644 dom/base/test/jsmodules/test_scriptNotParsedAsModule.html
 create mode 100644 dom/base/test/jsmodules/test_simpleImport.html
 create mode 100644 dom/base/test/jsmodules/test_syntaxError.html
 create mode 100644 dom/base/test/jsmodules/test_syntaxErrorAsync.html
 create mode 100644 dom/base/test/jsmodules/test_syntaxErrorInline.html
 create mode 100644 dom/base/test/jsmodules/test_syntaxErrorInlineAsync.html
 create mode 100644 dom/base/test/jsmodules/test_topLevelIntroType.html
 create mode 100644 dom/base/test/jsmodules/test_toplevelModuleMemoization.html
 create mode 100644 dom/base/test/jsmodules/test_typeAttrCaseInsensitive.html

(limited to 'dom/base/test/jsmodules')

diff --git a/dom/base/test/jsmodules/chrome.ini b/dom/base/test/jsmodules/chrome.ini
new file mode 100644
index 000000000..02a37a0ec
--- /dev/null
+++ b/dom/base/test/jsmodules/chrome.ini
@@ -0,0 +1,51 @@
+[DEFAULT]
+support-files =
+  module_setRan.js
+  module_testSyntax.js
+  module_badSyntax.js
+  module_simpleImport.js
+  module_simpleExport.js
+  module_badImport.js
+  module_simple1.js
+  module_simple2.js
+  module_simple3.js
+  module_cyclic1.js
+  module_cyclic2.js
+  module_cyclic3.js
+  module_multiImports.js
+  module_multiLargeImports.js
+  script_simple2.js
+  module_large1.js
+  module_large2.js
+  module_large3.js
+  module_extractIntroType.js
+  iframe_extractIntroType.html
+  module_missingImport.js
+
+[test_moduleScriptsRun.html]
+[test_moduleParsedAsModule.html]
+[test_scriptNotParsedAsModule.html]
+[test_typeAttrCaseInsensitive.html]
+[test_moduleNotFound.html]
+[test_importNotFound.html]
+[test_syntaxError.html]
+[test_syntaxErrorAsync.html]
+[test_syntaxErrorInline.html]
+[test_syntaxErrorInlineAsync.html]
+[test_simpleImport.html]
+[test_cyclicImport.html]
+[test_importResolveFailed.html]
+[test_multiTopLevelImports.html]
+[test_multiModuleImports.html]
+[test_multiAsyncImports.html]
+[test_scriptModuleOrder.html]
+[test_toplevelModuleMemoization.html]
+[test_importedModuleMemoization.html]
+[test_multiTopLevelLargeImports.html]
+[test_multiModuleLargeImports.html]
+[test_asyncInlineModules.html]
+[test_scriptInsertedModule.html]
+[test_linkErrorInCommon1.html]
+[test_linkErrorInCommon2.html]
+[test_topLevelIntroType.html]
+[test_importIntroType.html]
diff --git a/dom/base/test/jsmodules/iframe_extractIntroType.html b/dom/base/test/jsmodules/iframe_extractIntroType.html
new file mode 100644
index 000000000..692da0c5f
--- /dev/null
+++ b/dom/base/test/jsmodules/iframe_extractIntroType.html
@@ -0,0 +1,14 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+<script>
+  // Hook up the debugger statement to extract the calling script's
+  // introductionType and set it in a property on the parent global.
+  Components.utils.import("resource://gre/modules/jsdebugger.jsm");
+  addDebuggerToGlobal(this);
+  var dbg = new Debugger;
+  dbg.addDebuggee(parent);
+  dbg.onDebuggerStatement = function (frame) {
+    parent.introType = frame.script.source.introductionType;
+  }
+</script>
diff --git a/dom/base/test/jsmodules/mochitest.ini b/dom/base/test/jsmodules/mochitest.ini
new file mode 100644
index 000000000..aa2b8652c
--- /dev/null
+++ b/dom/base/test/jsmodules/mochitest.ini
@@ -0,0 +1,5 @@
+[DEFAULT]
+support-files =
+  module_setRan.js
+
+[test_moduleScriptsNotRun.html]
diff --git a/dom/base/test/jsmodules/module_badImport.js b/dom/base/test/jsmodules/module_badImport.js
new file mode 100644
index 000000000..ab1824915
--- /dev/null
+++ b/dom/base/test/jsmodules/module_badImport.js
@@ -0,0 +1 @@
+import "invalid specifier";
diff --git a/dom/base/test/jsmodules/module_badSyntax.js b/dom/base/test/jsmodules/module_badSyntax.js
new file mode 100644
index 000000000..744158108
--- /dev/null
+++ b/dom/base/test/jsmodules/module_badSyntax.js
@@ -0,0 +1,3 @@
+// Module with a syntax error.
+some invalid js syntax;
+wasRun = true;
diff --git a/dom/base/test/jsmodules/module_cyclic1.js b/dom/base/test/jsmodules/module_cyclic1.js
new file mode 100644
index 000000000..efcfb9a4e
--- /dev/null
+++ b/dom/base/test/jsmodules/module_cyclic1.js
@@ -0,0 +1,7 @@
+import { func2 } from "./module_cyclic2.js";
+
+export function func1(x, y) {
+    if (x <= 0)
+        return y;
+    return func2(x - 1, y + "1");
+}
diff --git a/dom/base/test/jsmodules/module_cyclic2.js b/dom/base/test/jsmodules/module_cyclic2.js
new file mode 100644
index 000000000..68a9c6124
--- /dev/null
+++ b/dom/base/test/jsmodules/module_cyclic2.js
@@ -0,0 +1,7 @@
+import { func3 } from "./module_cyclic3.js";
+
+export function func2(x, y) {
+    if (x <= 0)
+        return y;
+    return func3(x - 1, y + "2");
+}
diff --git a/dom/base/test/jsmodules/module_cyclic3.js b/dom/base/test/jsmodules/module_cyclic3.js
new file mode 100644
index 000000000..964949399
--- /dev/null
+++ b/dom/base/test/jsmodules/module_cyclic3.js
@@ -0,0 +1,7 @@
+import { func1 } from "./module_cyclic1.js";
+
+export function func3(x, y) {
+    if (x <= 0)
+        return y;
+    return func1(x - 1, y + "3");
+}
diff --git a/dom/base/test/jsmodules/module_extractIntroType.js b/dom/base/test/jsmodules/module_extractIntroType.js
new file mode 100644
index 000000000..be5685770
--- /dev/null
+++ b/dom/base/test/jsmodules/module_extractIntroType.js
@@ -0,0 +1,5 @@
+// Extract the introductionType for this module in conjunction with
+// iframe_extractIntroType.html.
+extractIntroType = function() {
+    debugger;
+}
diff --git a/dom/base/test/jsmodules/module_large1.js b/dom/base/test/jsmodules/module_large1.js
new file mode 100644
index 000000000..d6933d298
--- /dev/null
+++ b/dom/base/test/jsmodules/module_large1.js
@@ -0,0 +1,78 @@
+/*
+ * Scripts larger than 5KB may be compiled off main thread.  This is such a
+ * script.
+ *
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ */
+
+results.push(1);
diff --git a/dom/base/test/jsmodules/module_large2.js b/dom/base/test/jsmodules/module_large2.js
new file mode 100644
index 000000000..e1b6da4c9
--- /dev/null
+++ b/dom/base/test/jsmodules/module_large2.js
@@ -0,0 +1,78 @@
+/*
+ * Scripts larger than 5KB may be compiled off main thread.  This is such a
+ * script.
+ *
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ */
+
+results.push(2);
diff --git a/dom/base/test/jsmodules/module_large3.js b/dom/base/test/jsmodules/module_large3.js
new file mode 100644
index 000000000..c966a8eb2
--- /dev/null
+++ b/dom/base/test/jsmodules/module_large3.js
@@ -0,0 +1,78 @@
+/*
+ * Scripts larger than 5KB may be compiled off main thread.  This is such a
+ * script.
+ *
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ * large large large large large large large large large large large large
+ */
+
+results.push(3);
diff --git a/dom/base/test/jsmodules/module_missingImport.js b/dom/base/test/jsmodules/module_missingImport.js
new file mode 100644
index 000000000..28cf608de
--- /dev/null
+++ b/dom/base/test/jsmodules/module_missingImport.js
@@ -0,0 +1 @@
+import { missing } from "./module_simple1.js";
diff --git a/dom/base/test/jsmodules/module_multiImports.js b/dom/base/test/jsmodules/module_multiImports.js
new file mode 100644
index 000000000..0587ac5ca
--- /dev/null
+++ b/dom/base/test/jsmodules/module_multiImports.js
@@ -0,0 +1,4 @@
+import "./module_simple1.js";
+import "./module_simple2.js";
+import "./module_simple3.js";
+results.push(4);
diff --git a/dom/base/test/jsmodules/module_multiLargeImports.js b/dom/base/test/jsmodules/module_multiLargeImports.js
new file mode 100644
index 000000000..ddc5792d0
--- /dev/null
+++ b/dom/base/test/jsmodules/module_multiLargeImports.js
@@ -0,0 +1,4 @@
+import "./module_large1.js";
+import "./module_large2.js";
+import "./module_large3.js";
+results.push(4);
diff --git a/dom/base/test/jsmodules/module_setRan.js b/dom/base/test/jsmodules/module_setRan.js
new file mode 100644
index 000000000..4804382fd
--- /dev/null
+++ b/dom/base/test/jsmodules/module_setRan.js
@@ -0,0 +1,2 @@
+// Set a global flag to indicate that this module was executed.
+moduleRan = true;
diff --git a/dom/base/test/jsmodules/module_simple1.js b/dom/base/test/jsmodules/module_simple1.js
new file mode 100644
index 000000000..7594ac699
--- /dev/null
+++ b/dom/base/test/jsmodules/module_simple1.js
@@ -0,0 +1 @@
+results.push(1);
diff --git a/dom/base/test/jsmodules/module_simple2.js b/dom/base/test/jsmodules/module_simple2.js
new file mode 100644
index 000000000..f92a1c9d6
--- /dev/null
+++ b/dom/base/test/jsmodules/module_simple2.js
@@ -0,0 +1 @@
+results.push(2);
diff --git a/dom/base/test/jsmodules/module_simple3.js b/dom/base/test/jsmodules/module_simple3.js
new file mode 100644
index 000000000..71979926e
--- /dev/null
+++ b/dom/base/test/jsmodules/module_simple3.js
@@ -0,0 +1 @@
+results.push(3);
diff --git a/dom/base/test/jsmodules/module_simpleExport.js b/dom/base/test/jsmodules/module_simpleExport.js
new file mode 100644
index 000000000..9714d6d0a
--- /dev/null
+++ b/dom/base/test/jsmodules/module_simpleExport.js
@@ -0,0 +1 @@
+export let x = 42;
diff --git a/dom/base/test/jsmodules/module_simpleImport.js b/dom/base/test/jsmodules/module_simpleImport.js
new file mode 100644
index 000000000..cfc12bb72
--- /dev/null
+++ b/dom/base/test/jsmodules/module_simpleImport.js
@@ -0,0 +1,2 @@
+import { x } from "./module_simpleExport.js"
+result = x;
diff --git a/dom/base/test/jsmodules/module_testSyntax.js b/dom/base/test/jsmodules/module_testSyntax.js
new file mode 100644
index 000000000..3d647ae0b
--- /dev/null
+++ b/dom/base/test/jsmodules/module_testSyntax.js
@@ -0,0 +1,3 @@
+// Module that throws a syntax error if parsed as a script.
+export default 1;
+wasRun = true;
diff --git a/dom/base/test/jsmodules/moz.build b/dom/base/test/jsmodules/moz.build
new file mode 100644
index 000000000..f16b6dd80
--- /dev/null
+++ b/dom/base/test/jsmodules/moz.build
@@ -0,0 +1,13 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+MOCHITEST_MANIFESTS += [
+    'mochitest.ini'
+]
+
+MOCHITEST_CHROME_MANIFESTS += [
+    'chrome.ini'
+]
diff --git a/dom/base/test/jsmodules/script_simple2.js b/dom/base/test/jsmodules/script_simple2.js
new file mode 100644
index 000000000..f92a1c9d6
--- /dev/null
+++ b/dom/base/test/jsmodules/script_simple2.js
@@ -0,0 +1 @@
+results.push(2);
diff --git a/dom/base/test/jsmodules/test_asyncInlineModules.html b/dom/base/test/jsmodules/test_asyncInlineModules.html
new file mode 100644
index 000000000..62e411bfe
--- /dev/null
+++ b/dom/base/test/jsmodules/test_asyncInlineModules.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Test async inline modules</title>
+<script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+<script>
+  var results = [];
+
+  SimpleTest.waitForExplicitFinish();
+
+  function arrayEquals(a, b) {
+    if (a.length != b.length) {
+      return false;
+    }
+    for (let i = 0; i < a.length; i++) {
+      if (a[i] != b[i]) {
+        return false;
+      }
+      return true;
+    }
+  }
+
+  function testLoaded() {
+    ok(arrayEquals(results.sort(), [1, 2, 3]), 'Check modules imported');
+    SimpleTest.finish();
+  }
+</script>
+<script type="module" async>
+  results.push(1);
+</script>
+<script type="module" async>
+  import "./module_simple2.js";
+</script>
+<script type="module" async>
+  results.push(3);
+</script>
+<body onload='testLoaded()'></body>
diff --git a/dom/base/test/jsmodules/test_cyclicImport.html b/dom/base/test/jsmodules/test_cyclicImport.html
new file mode 100644
index 000000000..f70ae1d6b
--- /dev/null
+++ b/dom/base/test/jsmodules/test_cyclicImport.html
@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Test cyclic module imports</title>
+<script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+<script>
+  var result;
+
+  SimpleTest.waitForExplicitFinish();
+
+  function testLoaded() {
+    SimpleTest.finish();
+  }
+</script>
+<script type="module">
+  import { func1 } from "./module_cyclic1.js";
+  ok(func1(5, "") == "12312");
+</script>
+<body onload='testLoaded()'></body>
diff --git a/dom/base/test/jsmodules/test_importIntroType.html b/dom/base/test/jsmodules/test_importIntroType.html
new file mode 100644
index 000000000..3f8538282
--- /dev/null
+++ b/dom/base/test/jsmodules/test_importIntroType.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Test introduction type of an imported module</title>
+<script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+<script>
+  var introType;
+  var extractIntroType;
+
+  info('start');
+  SimpleTest.waitForExplicitFinish();
+
+  function testIntroductionType() {
+    extractIntroType();
+    ok(introType == "importedModule", 'Check introduction type');
+    SimpleTest.finish();
+  }
+</script>
+<iframe src="iframe_extractIntroType.html"></iframe>
+<script type="module">
+import "./module_extractIntroType.js";
+</script>
+<body onload='testIntroductionType()'></body>
diff --git a/dom/base/test/jsmodules/test_importNotFound.html b/dom/base/test/jsmodules/test_importNotFound.html
new file mode 100644
index 000000000..f4e12dfe7
--- /dev/null
+++ b/dom/base/test/jsmodules/test_importNotFound.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Test what happens when a module import is not found</title>
+<script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+<script>
+  var wasRun = false;
+  var errorCount = 0;
+  var eventCount = 0;
+
+  SimpleTest.waitForExplicitFinish();
+
+  window.onerror = function(message, url, line, column, error) {
+    errorCount++;
+  }
+
+  function testError() {
+    ok(!wasRun, 'Check script was not run');
+    ok(eventCount == 1, 'Check that an error event was fired');
+    ok(errorCount == 0, 'Check that no error was reported');
+    SimpleTest.finish();
+  }
+</script>
+<script type="module" onerror="eventCount++">
+import "./nonExistentModule.js";
+wasRun = true;
+</script>
+<body onload='testError()'></body>
diff --git a/dom/base/test/jsmodules/test_importResolveFailed.html b/dom/base/test/jsmodules/test_importResolveFailed.html
new file mode 100644
index 000000000..7df521d05
--- /dev/null
+++ b/dom/base/test/jsmodules/test_importResolveFailed.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Test error thrown when an import cannot be resolved</title>
+<script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+<script>
+  var hadTypeError = false;
+
+  SimpleTest.waitForExplicitFinish();
+  window.onerror = handleError;
+
+  function handleError(message, url, line, column, error) {
+    hadTypeError = error instanceof TypeError;
+  }
+
+  function testError() {
+    ok(hadTypeError, 'Check that a TypeError was thrown');
+    SimpleTest.finish();
+  }
+</script>
+<script type="module" src="module_badImport.js"></script>
+<body onload='testError()'></body>
diff --git a/dom/base/test/jsmodules/test_importedModuleMemoization.html b/dom/base/test/jsmodules/test_importedModuleMemoization.html
new file mode 100644
index 000000000..56c1188af
--- /dev/null
+++ b/dom/base/test/jsmodules/test_importedModuleMemoization.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Test imported modules are momoized and only loaded once</title>
+<script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+<script>
+  var results = [];
+
+  SimpleTest.waitForExplicitFinish();
+
+  function arrayEquals(a, b) {
+    if (a.length != b.length) {
+      return false;
+    }
+    for (let i = 0; i < a.length; i++) {
+      if (a[i] != b[i]) {
+        return false;
+      }
+      return true;
+    }
+  }
+
+  function testLoaded() {
+    ok(arrayEquals(results, [1, 2, 3, 4]), 'Check modules only evaluated once');
+    SimpleTest.finish();
+  }
+</script>
+<script type="module" src="module_multiImports.js"></script>
+<script type="module" src="module_multiImports.js"></script>
+<script type="module" src="module_multiImports.js"></script>
+<body onload='testLoaded()'></body>
diff --git a/dom/base/test/jsmodules/test_linkErrorInCommon1.html b/dom/base/test/jsmodules/test_linkErrorInCommon1.html
new file mode 100644
index 000000000..3d1cb172f
--- /dev/null
+++ b/dom/base/test/jsmodules/test_linkErrorInCommon1.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Test handling of a link error in a common module</title>
+<script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+<script>
+  var runCount = 0;
+  var hadSyntaxError = false;
+
+  SimpleTest.waitForExplicitFinish();
+  window.onerror = handleError;
+
+  function handleError(message, url, line, column, error) {
+    if (error instanceof SyntaxError) {
+      hadSyntaxError = true;
+    }
+  }
+
+  function testError() {
+    ok(runCount == 0, 'Check no modules were executed');
+    ok(hadSyntaxError, 'Check that an error was reported');
+    SimpleTest.finish();
+  }
+</script>
+<script type="module">
+  import { missing } from "./module_simple1.js";
+  runCount++;
+</script>
+<script type="module">
+  import { missing } from "./module_simple1.js";
+  runCount++;
+</script>
+<body onload='testError()'></body>
diff --git a/dom/base/test/jsmodules/test_linkErrorInCommon2.html b/dom/base/test/jsmodules/test_linkErrorInCommon2.html
new file mode 100644
index 000000000..4bf10b1d0
--- /dev/null
+++ b/dom/base/test/jsmodules/test_linkErrorInCommon2.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Test handling of a link error in a common module</title>
+<script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+<script>
+  var runCount = 0;
+  var hadSyntaxError = false;
+
+  SimpleTest.waitForExplicitFinish();
+  window.onerror = handleError;
+
+  function handleError(message, url, line, column, error) {
+    if (error instanceof SyntaxError) {
+      hadSyntaxError = true;
+    }
+  }
+
+  function testError() {
+    ok(runCount == 0, 'Check no modules were executed');
+    ok(hadSyntaxError, 'Check that an error was reported');
+    SimpleTest.finish();
+  }
+</script>
+<script type="module">
+  import "./module_missingImport.js";
+  runCount++;
+</script>
+<script type="module">
+  import "./module_missingImport.js";
+  runCount++;
+</script>
+<body onload='testError()'></body>
diff --git a/dom/base/test/jsmodules/test_moduleNotFound.html b/dom/base/test/jsmodules/test_moduleNotFound.html
new file mode 100644
index 000000000..448292968
--- /dev/null
+++ b/dom/base/test/jsmodules/test_moduleNotFound.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Test what happens when a top-level module is not found</title>
+<script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+<script>
+  var wasRun = false;
+  var errorCount = 0;
+  var eventCount = 0;
+
+  SimpleTest.waitForExplicitFinish();
+
+  window.onerror = function(message, url, line, column, error) {
+    errorCount++;
+  }
+
+  function testError() {
+    ok(eventCount == 1, 'Check that an error event was fired');
+    ok(errorCount == 0, 'Check that no error was reported');
+    SimpleTest.finish();
+  }
+</script>
+<script type="module" src="./nonExistentModule.js" onerror="eventCount++">
+</script>
+<body onload='testError()'></body>
diff --git a/dom/base/test/jsmodules/test_moduleParsedAsModule.html b/dom/base/test/jsmodules/test_moduleParsedAsModule.html
new file mode 100644
index 000000000..72eb1149e
--- /dev/null
+++ b/dom/base/test/jsmodules/test_moduleParsedAsModule.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Test module script parsed as module</title>
+<script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+<script>
+  var wasRun = false;
+  var hadSyntaxError = false;
+
+  SimpleTest.waitForExplicitFinish();
+  window.onerror = handleError;
+
+  function handleError(message, url, line, column, error) {
+    hadSyntaxError = error instanceof SyntaxError;
+  }
+
+  function testError() {
+    ok(wasRun, 'Check module was run');
+    ok(!hadSyntaxError, 'Check that no SyntaxError was thrown');
+    SimpleTest.finish();
+  }
+</script>
+<script type="module" src="module_testSyntax.js"></script>
+<body onload='testError()'></body>
diff --git a/dom/base/test/jsmodules/test_moduleScriptsNotRun.html b/dom/base/test/jsmodules/test_moduleScriptsNotRun.html
new file mode 100644
index 000000000..1ce5377d9
--- /dev/null
+++ b/dom/base/test/jsmodules/test_moduleScriptsNotRun.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Test script elements with type="module" are not run for content HTML</title>
+<script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+<script>
+  var inlineModuleRan = false;
+  var moduleRan = false;
+
+  SimpleTest.waitForExplicitFinish();
+
+  function testLoaded() {
+    ok(!moduleRan, "Check module script was not run");
+    ok(!inlineModuleRan, "Check inline module script was not run");
+    SimpleTest.finish();
+  }
+</script>
+<script type="module" src="module_setRan.js"></script>
+<script type="module">inlineModuleRan = true;</script>
+<body onload='testLoaded()'></body>
diff --git a/dom/base/test/jsmodules/test_moduleScriptsRun.html b/dom/base/test/jsmodules/test_moduleScriptsRun.html
new file mode 100644
index 000000000..be2cbb2af
--- /dev/null
+++ b/dom/base/test/jsmodules/test_moduleScriptsRun.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Test script elements with type="module" are run for chrome HTML</title>
+<script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+<script>
+  var inlineModuleRan = false;
+  var moduleRan = false;
+
+  SimpleTest.waitForExplicitFinish();
+
+  function testLoaded() {
+    ok(moduleRan, 'Check module script was run');
+    ok(inlineModuleRan, 'Check inline module script was run');
+    SimpleTest.finish();
+  }
+</script>
+<script type="module" src="module_setRan.js"></script>
+<script type="module">inlineModuleRan = true;</script>
+<body onload='testLoaded()'></body>
diff --git a/dom/base/test/jsmodules/test_multiAsyncImports.html b/dom/base/test/jsmodules/test_multiAsyncImports.html
new file mode 100644
index 000000000..d2f5e42ab
--- /dev/null
+++ b/dom/base/test/jsmodules/test_multiAsyncImports.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Test a loading multiple modules with the async attribute from top level</title>
+<script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+<script>
+  var results = [];
+
+  SimpleTest.waitForExplicitFinish();
+
+  function arrayEquals(a, b) {
+    if (a.length != b.length) {
+      return false;
+    }
+    for (let i = 0; i < a.length; i++) {
+      if (a[i] != b[i]) {
+        return false;
+      }
+      return true;
+    }
+  }
+
+  function testLoaded() {
+    ok(arrayEquals(results.sort(), [1, 2, 3]), 'Check modules imported');
+    SimpleTest.finish();
+  }
+</script>
+<script type="module" src="module_simple1.js" async></script>
+<script type="module" src="module_simple2.js" async></script>
+<script type="module" src="module_simple3.js" async></script>
+<body onload='testLoaded()'></body>
diff --git a/dom/base/test/jsmodules/test_multiModuleImports.html b/dom/base/test/jsmodules/test_multiModuleImports.html
new file mode 100644
index 000000000..f7abd7cee
--- /dev/null
+++ b/dom/base/test/jsmodules/test_multiModuleImports.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Test a importing multiple modules from a module</title>
+<script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+<script>
+  var results = [];
+
+  SimpleTest.waitForExplicitFinish();
+
+  function arrayEquals(a, b) {
+    if (a.length != b.length) {
+      return false;
+    }
+    for (let i = 0; i < a.length; i++) {
+      if (a[i] != b[i]) {
+        return false;
+      }
+      return true;
+    }
+  }
+
+  function testLoaded() {
+    ok(arrayEquals(results, [1, 2, 3, 4]), 'Check modules imported');
+    SimpleTest.finish();
+  }
+</script>
+<script type="module" src="module_multiImports.js"></script>
+<body onload='testLoaded()'></body>
diff --git a/dom/base/test/jsmodules/test_multiModuleLargeImports.html b/dom/base/test/jsmodules/test_multiModuleLargeImports.html
new file mode 100644
index 000000000..14f6c76c3
--- /dev/null
+++ b/dom/base/test/jsmodules/test_multiModuleLargeImports.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Test importing multiple large modules which may be compiled off main thread from a module</title>
+<script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+<script>
+  var results = [];
+
+  SimpleTest.waitForExplicitFinish();
+
+  function arrayEquals(a, b) {
+    if (a.length != b.length) {
+      return false;
+    }
+    for (let i = 0; i < a.length; i++) {
+      if (a[i] != b[i]) {
+        return false;
+      }
+      return true;
+    }
+  }
+
+  function testLoaded() {
+    ok(arrayEquals(results, [1, 2, 3, 4]), 'Check modules imported');
+    SimpleTest.finish();
+  }
+</script>
+<script type="module" src="module_multiLargeImports.js"></script>
+<body onload='testLoaded()'></body>
diff --git a/dom/base/test/jsmodules/test_multiTopLevelImports.html b/dom/base/test/jsmodules/test_multiTopLevelImports.html
new file mode 100644
index 000000000..583087b4f
--- /dev/null
+++ b/dom/base/test/jsmodules/test_multiTopLevelImports.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Test importing multiple modules from top level</title>
+<script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+<script>
+  var results = [];
+
+  SimpleTest.waitForExplicitFinish();
+
+  function arrayEquals(a, b) {
+    if (a.length != b.length) {
+      return false;
+    }
+    for (let i = 0; i < a.length; i++) {
+      if (a[i] != b[i]) {
+        return false;
+      }
+      return true;
+    }
+  }
+
+  function testLoaded() {
+    ok(arrayEquals(results, [1, 2, 3]), 'Check modules imported');
+    SimpleTest.finish();
+  }
+</script>
+<script type="module" src="module_simple1.js"></script>
+<script type="module" src="module_simple2.js"></script>
+<script type="module" src="module_simple3.js"></script>
+<body onload='testLoaded()'></body>
diff --git a/dom/base/test/jsmodules/test_multiTopLevelLargeImports.html b/dom/base/test/jsmodules/test_multiTopLevelLargeImports.html
new file mode 100644
index 000000000..6fd237c86
--- /dev/null
+++ b/dom/base/test/jsmodules/test_multiTopLevelLargeImports.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Test a importing large modules which may be compiled off main thread</title>
+<script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+<script>
+  var results = [];
+
+  SimpleTest.waitForExplicitFinish();
+
+  function arrayEquals(a, b) {
+    if (a.length != b.length) {
+      return false;
+    }
+    for (let i = 0; i < a.length; i++) {
+      if (a[i] != b[i]) {
+        return false;
+      }
+      return true;
+    }
+  }
+
+  function testLoaded() {
+    ok(arrayEquals(results, [1, 2, 3]), 'Check modules imported');
+    SimpleTest.finish();
+  }
+</script>
+<script type="module" src="module_large1.js"></script>
+<script type="module" src="module_simple2.js"></script>
+<script type="module" src="module_large3.js"></script>
+<body onload='testLoaded()'></body>
diff --git a/dom/base/test/jsmodules/test_scriptInsertedModule.html b/dom/base/test/jsmodules/test_scriptInsertedModule.html
new file mode 100644
index 000000000..0afc259f8
--- /dev/null
+++ b/dom/base/test/jsmodules/test_scriptInsertedModule.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Test a script-inserted module</title>
+<script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+<script>
+  var result;
+
+  let script = document.createElement("script");
+  script.type = "module";
+  script.src = "./module_simpleImport.js";
+  document.head.appendChild(script);
+
+  SimpleTest.waitForExplicitFinish();
+
+  function testLoaded() {
+    ok(result == 42);
+    SimpleTest.finish();
+  }
+</script>
+<body onload='testLoaded()'></body>
diff --git a/dom/base/test/jsmodules/test_scriptModuleOrder.html b/dom/base/test/jsmodules/test_scriptModuleOrder.html
new file mode 100644
index 000000000..ffc135006
--- /dev/null
+++ b/dom/base/test/jsmodules/test_scriptModuleOrder.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Test execution order of deferred scripts and modules </title>
+<script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+<script>
+  var results = [];
+
+  SimpleTest.waitForExplicitFinish();
+
+  function arrayEquals(a, b) {
+    if (a.length != b.length) {
+      return false;
+    }
+    for (let i = 0; i < a.length; i++) {
+      if (a[i] != b[i]) {
+        return false;
+      }
+      return true;
+    }
+  }
+
+  function testLoaded() {
+    ok(arrayEquals(results, [1, 2, 3]), 'Check execution order');
+    SimpleTest.finish();
+  }
+</script>
+<script type="module" src="module_simple1.js"></script>
+<script defer src="script_simple2.js"></script>
+<script type="module" src="module_simple3.js"></script>
+<body onload='testLoaded()'></body>
diff --git a/dom/base/test/jsmodules/test_scriptNotParsedAsModule.html b/dom/base/test/jsmodules/test_scriptNotParsedAsModule.html
new file mode 100644
index 000000000..c83290776
--- /dev/null
+++ b/dom/base/test/jsmodules/test_scriptNotParsedAsModule.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Test classic script not parsed as module</title>
+<script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+<script>
+  var wasRun = false;
+  var hadSyntaxError = false;
+
+  SimpleTest.waitForExplicitFinish();
+  window.onerror = handleError;
+
+  function handleError(message, url, line, column, error) {
+    hadSyntaxError = error instanceof SyntaxError;
+  }
+
+  function testError() {
+    ok(!wasRun, 'Check script was not run');
+    ok(hadSyntaxError, 'Check that a SyntaxError was thrown');
+    SimpleTest.finish();
+  }
+</script>
+<script src="module_testSyntax.js"></script>
+<body onload='testError()'></body>
diff --git a/dom/base/test/jsmodules/test_simpleImport.html b/dom/base/test/jsmodules/test_simpleImport.html
new file mode 100644
index 000000000..4c836cd31
--- /dev/null
+++ b/dom/base/test/jsmodules/test_simpleImport.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Test a simple module import</title>
+<script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+<script>
+  var result;
+
+  SimpleTest.waitForExplicitFinish();
+
+  function testLoaded() {
+    ok(result == 42, 'Check imported value');
+    SimpleTest.finish();
+  }
+</script>
+<script type="module" src="module_simpleImport.js"></script>
+<body onload='testLoaded()'></body>
diff --git a/dom/base/test/jsmodules/test_syntaxError.html b/dom/base/test/jsmodules/test_syntaxError.html
new file mode 100644
index 000000000..53f95c96c
--- /dev/null
+++ b/dom/base/test/jsmodules/test_syntaxError.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Test syntax errors parsing a module are reported</title>
+<script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+<script>
+  var wasRun = false;
+  var hadSyntaxError = false;
+
+  SimpleTest.waitForExplicitFinish();
+  window.onerror = handleError;
+
+  function handleError(message, url, line, column, error) {
+    hadSyntaxError = error instanceof SyntaxError;
+  }
+
+  function testError() {
+    ok(!wasRun, 'Check script was not run');
+    ok(hadSyntaxError, 'Check that a SyntaxError was thrown');
+    SimpleTest.finish();
+  }
+</script>
+<script type="module" src="module_badSyntax.js"></script>
+<body onload='testError()'></body>
diff --git a/dom/base/test/jsmodules/test_syntaxErrorAsync.html b/dom/base/test/jsmodules/test_syntaxErrorAsync.html
new file mode 100644
index 000000000..35d923755
--- /dev/null
+++ b/dom/base/test/jsmodules/test_syntaxErrorAsync.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Test syntax errors parsing an async module are reported</title>
+<script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+<script>
+  var wasRun = false;
+  var hadSyntaxError = false;
+
+  SimpleTest.waitForExplicitFinish();
+  window.onerror = handleError;
+
+  function handleError(message, url, line, column, error) {
+    hadSyntaxError = error instanceof SyntaxError;
+  }
+
+  function testError() {
+    ok(!wasRun, 'Check script was not run');
+    ok(hadSyntaxError, 'Check that a SyntaxError was thrown');
+    SimpleTest.finish();
+  }
+</script>
+<script type="module" src="module_badSyntax.js" async></script>
+<body onload='testError()'></body>
diff --git a/dom/base/test/jsmodules/test_syntaxErrorInline.html b/dom/base/test/jsmodules/test_syntaxErrorInline.html
new file mode 100644
index 000000000..705bc5902
--- /dev/null
+++ b/dom/base/test/jsmodules/test_syntaxErrorInline.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Test syntax errors parsing an inline module are reported</title>
+<script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+<script>
+  var wasRun = false;
+  var hadSyntaxError = false;
+
+  SimpleTest.waitForExplicitFinish();
+  window.onerror = handleError;
+
+  function handleError(message, url, line, column, error) {
+    hadSyntaxError = error instanceof SyntaxError;
+  }
+
+  function testError() {
+    ok(!wasRun, 'Check script was not run');
+    ok(hadSyntaxError, 'Check that a SyntaxError was thrown');
+    SimpleTest.finish();
+  }
+</script>
+<script type="module">
+// Module with a syntax error.
+some invalid js syntax;
+wasRun = true;
+</script>
+<body onload='testError()'></body>
diff --git a/dom/base/test/jsmodules/test_syntaxErrorInlineAsync.html b/dom/base/test/jsmodules/test_syntaxErrorInlineAsync.html
new file mode 100644
index 000000000..5e7992823
--- /dev/null
+++ b/dom/base/test/jsmodules/test_syntaxErrorInlineAsync.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Test syntax errors parsing an inline async module are reported</title>
+<script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+<script>
+  var wasRun = false;
+  var hadSyntaxError = false;
+
+  SimpleTest.waitForExplicitFinish();
+  window.onerror = handleError;
+
+  function handleError(message, url, line, column, error) {
+    hadSyntaxError = error instanceof SyntaxError;
+  }
+
+  function testError() {
+    ok(!wasRun, 'Check script was not run');
+    ok(hadSyntaxError, 'Check that a SyntaxError was thrown');
+    SimpleTest.finish();
+  }
+</script>
+<script type="module" async>
+// Module with a syntax error.
+some invalid js syntax;
+wasRun = true;
+</script>
+<body onload='testError()'></body>
diff --git a/dom/base/test/jsmodules/test_topLevelIntroType.html b/dom/base/test/jsmodules/test_topLevelIntroType.html
new file mode 100644
index 000000000..ab4c80815
--- /dev/null
+++ b/dom/base/test/jsmodules/test_topLevelIntroType.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Test introduction type of a top-level module</title>
+<script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+<script>
+  var introType;
+  var extractIntroType;
+
+  info('start');
+  SimpleTest.waitForExplicitFinish();
+
+  function testIntroductionType() {
+    extractIntroType();
+    ok(introType == "scriptElement", 'Check introduction type');
+    SimpleTest.finish();
+  }
+</script>
+<iframe src="iframe_extractIntroType.html"></iframe>
+<script type="module" src="module_extractIntroType.js">
+</script>
+<body onload='testIntroductionType()'></body>
diff --git a/dom/base/test/jsmodules/test_toplevelModuleMemoization.html b/dom/base/test/jsmodules/test_toplevelModuleMemoization.html
new file mode 100644
index 000000000..0e1ee728e
--- /dev/null
+++ b/dom/base/test/jsmodules/test_toplevelModuleMemoization.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Test toplevel modules are momoized and only loaded once</title>
+<script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+<script>
+  var results = [];
+
+  SimpleTest.waitForExplicitFinish();
+
+  function arrayEquals(a, b) {
+    if (a.length != b.length) {
+      return false;
+    }
+    for (let i = 0; i < a.length; i++) {
+      if (a[i] != b[i]) {
+        return false;
+      }
+      return true;
+    }
+  }
+
+  function testLoaded() {
+    ok(arrayEquals(results, [1]), 'Check execution order');
+    SimpleTest.finish();
+  }
+</script>
+<script type="module" src="module_simple1.js"></script>
+<script type="module" src="module_simple1.js"></script>
+<script type="module" src="module_simple1.js"></script>
+<body onload='testLoaded()'></body>
diff --git a/dom/base/test/jsmodules/test_typeAttrCaseInsensitive.html b/dom/base/test/jsmodules/test_typeAttrCaseInsensitive.html
new file mode 100644
index 000000000..7a3f93740
--- /dev/null
+++ b/dom/base/test/jsmodules/test_typeAttrCaseInsensitive.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Test script element's type attribute comparision is case-insensitive</title>
+<script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+<script>
+  var inlineModuleRan = false;
+  var moduleRan = false;
+
+  SimpleTest.waitForExplicitFinish();
+
+  function testLoaded() {
+    ok(moduleRan, 'Check module script was run');
+    ok(inlineModuleRan, 'Check inline module script was run');
+    SimpleTest.finish();
+  }
+</script>
+<script type="MODULE" src="module_setRan.js"></script>
+<script type="mOdUlE">inlineModuleRan = true;</script>
+<body onload='testLoaded()'></body>
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