From 26a029d407be480d791972afb5975cf62c9360a6 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Fri, 19 Apr 2024 02:47:55 +0200
Subject: Adding upstream version 124.0.1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 .../test/jsmodules/importmaps/bad/module_2.mjs     |  1 +
 .../test/jsmodules/importmaps/bad/module_3.mjs     |  8 +++
 .../test/jsmodules/importmaps/bad/module_4.mjs     |  1 +
 .../test/jsmodules/importmaps/bad/module_7.mjs     |  1 +
 .../jsmodules/importmaps/bug_1865410_module_a.mjs  |  2 +
 .../jsmodules/importmaps/bug_1865410_module_b.mjs  |  1 +
 dom/base/test/jsmodules/importmaps/bug_1873417.mjs |  2 +
 dom/base/test/jsmodules/importmaps/chrome.toml     | 37 +++++++++++
 .../jsmodules/importmaps/circular_dependency.mjs   |  6 ++
 .../jsmodules/importmaps/external_importMap.js     |  5 ++
 .../test/jsmodules/importmaps/good/module_0.mjs    |  1 +
 .../test/jsmodules/importmaps/good/module_1.mjs    |  1 +
 .../test/jsmodules/importmaps/good/module_2.mjs    |  1 +
 .../test/jsmodules/importmaps/good/module_3.mjs    |  6 ++
 .../test/jsmodules/importmaps/good/module_4.mjs    |  1 +
 .../test/jsmodules/importmaps/good/module_7.mjs    |  1 +
 .../jsmodules/importmaps/insert_a_base_element.js  |  4 ++
 dom/base/test/jsmodules/importmaps/mochitest.toml  | 33 ++++++++++
 .../module_importMap_with_external_script_0.mjs    |  3 +
 .../module_importMap_with_external_script_1.mjs    |  3 +
 .../module_importMap_with_external_script_2.mjs    |  3 +
 .../module_importMap_with_external_script_3.mjs    |  3 +
 .../module_importMap_with_external_script_4.mjs    |  3 +
 .../module_importMap_with_external_script_5.mjs    |  3 +
 ...e_importMap_with_external_script_5.mjs^headers^ |  2 +
 .../module_importMap_with_external_script_6.mjs    |  3 +
 ...e_importMap_with_external_script_6.mjs^headers^ |  2 +
 .../module_importMap_with_external_script_7.mjs    |  3 +
 .../jsmodules/importmaps/module_simpleExport.mjs   |  1 +
 .../importmaps/module_simpleImportMap.mjs          |  4 ++
 .../importmaps/module_simpleImportMap_dir.mjs      |  4 ++
 .../importmaps/module_simpleImportMap_remap.mjs    |  4 ++
 .../module_simpleImportMap_remap_https.mjs         |  4 ++
 .../importmaps/module_sortedImportMap.mjs          |  6 ++
 dom/base/test/jsmodules/importmaps/moz.build       |  9 +++
 .../importmaps/scope1/module_simpleExport.mjs      |  1 +
 .../importmaps/scope1/module_simpleImportMap.mjs   |  4 ++
 .../scope1/scope2/module_simpleExport.mjs          |  1 +
 .../scope1/scope2/module_simpleImportMap.mjs       |  4 ++
 .../jsmodules/importmaps/test_bug_1865410.html     | 27 ++++++++
 .../jsmodules/importmaps/test_bug_1873417.html     | 39 +++++++++++
 .../test_dynamic_import_reject_importMap.html      | 46 +++++++++++++
 .../importmaps/test_externalImportMap.html         | 43 +++++++++++++
 .../test_importMap_with_external_script.html       | 75 ++++++++++++++++++++++
 .../test_import_meta_resolve_importMap.html        | 49 ++++++++++++++
 .../test_inline_module_reject_importMap.html       | 61 ++++++++++++++++++
 .../importmaps/test_load_importMap_with_base.html  | 51 +++++++++++++++
 .../importmaps/test_load_importMap_with_base2.html | 51 +++++++++++++++
 .../test_module_script_reject_importMap.html       | 45 +++++++++++++
 .../importmaps/test_parse_importMap_failed.html    | 40 ++++++++++++
 .../test_reject_multiple_importMaps.html           | 64 ++++++++++++++++++
 .../jsmodules/importmaps/test_simpleImportMap.html | 62 ++++++++++++++++++
 .../jsmodules/importmaps/test_sortedImportMap.html | 62 ++++++++++++++++++
 53 files changed, 897 insertions(+)
 create mode 100644 dom/base/test/jsmodules/importmaps/bad/module_2.mjs
 create mode 100644 dom/base/test/jsmodules/importmaps/bad/module_3.mjs
 create mode 100644 dom/base/test/jsmodules/importmaps/bad/module_4.mjs
 create mode 100644 dom/base/test/jsmodules/importmaps/bad/module_7.mjs
 create mode 100644 dom/base/test/jsmodules/importmaps/bug_1865410_module_a.mjs
 create mode 100644 dom/base/test/jsmodules/importmaps/bug_1865410_module_b.mjs
 create mode 100644 dom/base/test/jsmodules/importmaps/bug_1873417.mjs
 create mode 100644 dom/base/test/jsmodules/importmaps/chrome.toml
 create mode 100644 dom/base/test/jsmodules/importmaps/circular_dependency.mjs
 create mode 100644 dom/base/test/jsmodules/importmaps/external_importMap.js
 create mode 100644 dom/base/test/jsmodules/importmaps/good/module_0.mjs
 create mode 100644 dom/base/test/jsmodules/importmaps/good/module_1.mjs
 create mode 100644 dom/base/test/jsmodules/importmaps/good/module_2.mjs
 create mode 100644 dom/base/test/jsmodules/importmaps/good/module_3.mjs
 create mode 100644 dom/base/test/jsmodules/importmaps/good/module_4.mjs
 create mode 100644 dom/base/test/jsmodules/importmaps/good/module_7.mjs
 create mode 100644 dom/base/test/jsmodules/importmaps/insert_a_base_element.js
 create mode 100644 dom/base/test/jsmodules/importmaps/mochitest.toml
 create mode 100644 dom/base/test/jsmodules/importmaps/module_importMap_with_external_script_0.mjs
 create mode 100644 dom/base/test/jsmodules/importmaps/module_importMap_with_external_script_1.mjs
 create mode 100644 dom/base/test/jsmodules/importmaps/module_importMap_with_external_script_2.mjs
 create mode 100644 dom/base/test/jsmodules/importmaps/module_importMap_with_external_script_3.mjs
 create mode 100644 dom/base/test/jsmodules/importmaps/module_importMap_with_external_script_4.mjs
 create mode 100644 dom/base/test/jsmodules/importmaps/module_importMap_with_external_script_5.mjs
 create mode 100644 dom/base/test/jsmodules/importmaps/module_importMap_with_external_script_5.mjs^headers^
 create mode 100644 dom/base/test/jsmodules/importmaps/module_importMap_with_external_script_6.mjs
 create mode 100644 dom/base/test/jsmodules/importmaps/module_importMap_with_external_script_6.mjs^headers^
 create mode 100644 dom/base/test/jsmodules/importmaps/module_importMap_with_external_script_7.mjs
 create mode 100644 dom/base/test/jsmodules/importmaps/module_simpleExport.mjs
 create mode 100644 dom/base/test/jsmodules/importmaps/module_simpleImportMap.mjs
 create mode 100644 dom/base/test/jsmodules/importmaps/module_simpleImportMap_dir.mjs
 create mode 100644 dom/base/test/jsmodules/importmaps/module_simpleImportMap_remap.mjs
 create mode 100644 dom/base/test/jsmodules/importmaps/module_simpleImportMap_remap_https.mjs
 create mode 100644 dom/base/test/jsmodules/importmaps/module_sortedImportMap.mjs
 create mode 100644 dom/base/test/jsmodules/importmaps/moz.build
 create mode 100644 dom/base/test/jsmodules/importmaps/scope1/module_simpleExport.mjs
 create mode 100644 dom/base/test/jsmodules/importmaps/scope1/module_simpleImportMap.mjs
 create mode 100644 dom/base/test/jsmodules/importmaps/scope1/scope2/module_simpleExport.mjs
 create mode 100644 dom/base/test/jsmodules/importmaps/scope1/scope2/module_simpleImportMap.mjs
 create mode 100644 dom/base/test/jsmodules/importmaps/test_bug_1865410.html
 create mode 100644 dom/base/test/jsmodules/importmaps/test_bug_1873417.html
 create mode 100644 dom/base/test/jsmodules/importmaps/test_dynamic_import_reject_importMap.html
 create mode 100644 dom/base/test/jsmodules/importmaps/test_externalImportMap.html
 create mode 100644 dom/base/test/jsmodules/importmaps/test_importMap_with_external_script.html
 create mode 100644 dom/base/test/jsmodules/importmaps/test_import_meta_resolve_importMap.html
 create mode 100644 dom/base/test/jsmodules/importmaps/test_inline_module_reject_importMap.html
 create mode 100644 dom/base/test/jsmodules/importmaps/test_load_importMap_with_base.html
 create mode 100644 dom/base/test/jsmodules/importmaps/test_load_importMap_with_base2.html
 create mode 100644 dom/base/test/jsmodules/importmaps/test_module_script_reject_importMap.html
 create mode 100644 dom/base/test/jsmodules/importmaps/test_parse_importMap_failed.html
 create mode 100644 dom/base/test/jsmodules/importmaps/test_reject_multiple_importMaps.html
 create mode 100644 dom/base/test/jsmodules/importmaps/test_simpleImportMap.html
 create mode 100644 dom/base/test/jsmodules/importmaps/test_sortedImportMap.html

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

diff --git a/dom/base/test/jsmodules/importmaps/bad/module_2.mjs b/dom/base/test/jsmodules/importmaps/bad/module_2.mjs
new file mode 100644
index 0000000000..86c4251413
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/bad/module_2.mjs
@@ -0,0 +1 @@
+throw "Shouldn't load file bad/module_2.mjs";
diff --git a/dom/base/test/jsmodules/importmaps/bad/module_3.mjs b/dom/base/test/jsmodules/importmaps/bad/module_3.mjs
new file mode 100644
index 0000000000..f0595118d4
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/bad/module_3.mjs
@@ -0,0 +1,8 @@
+// eslint-disable-next-line import/no-unassigned-import, import/no-unresolved
+import {} from "../circular_depdendency.mjs";
+
+export function exportedFunction() {
+  throw "Wrong version of function called";
+}
+
+throw "Shouldn't laod file bad/module_3.mjs";
diff --git a/dom/base/test/jsmodules/importmaps/bad/module_4.mjs b/dom/base/test/jsmodules/importmaps/bad/module_4.mjs
new file mode 100644
index 0000000000..93dd8245ce
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/bad/module_4.mjs
@@ -0,0 +1 @@
+throw "Shouldn't load file bad/module_4.mjs";
diff --git a/dom/base/test/jsmodules/importmaps/bad/module_7.mjs b/dom/base/test/jsmodules/importmaps/bad/module_7.mjs
new file mode 100644
index 0000000000..8844bf862c
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/bad/module_7.mjs
@@ -0,0 +1 @@
+throw "Shouldn't load file bad/module_7.mjs";
diff --git a/dom/base/test/jsmodules/importmaps/bug_1865410_module_a.mjs b/dom/base/test/jsmodules/importmaps/bug_1865410_module_a.mjs
new file mode 100644
index 0000000000..07d43d115e
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/bug_1865410_module_a.mjs
@@ -0,0 +1,2 @@
+// eslint-disable-next-line import/no-unassigned-import
+import {} from "./bug_1865410_module_b.mjs";
diff --git a/dom/base/test/jsmodules/importmaps/bug_1865410_module_b.mjs b/dom/base/test/jsmodules/importmaps/bug_1865410_module_b.mjs
new file mode 100644
index 0000000000..2bd6dce476
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/bug_1865410_module_b.mjs
@@ -0,0 +1 @@
+// Empty.
diff --git a/dom/base/test/jsmodules/importmaps/bug_1873417.mjs b/dom/base/test/jsmodules/importmaps/bug_1873417.mjs
new file mode 100644
index 0000000000..339e6acf91
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/bug_1873417.mjs
@@ -0,0 +1,2 @@
+console.log("Module loaded successfully!");
+state = "loaded";
diff --git a/dom/base/test/jsmodules/importmaps/chrome.toml b/dom/base/test/jsmodules/importmaps/chrome.toml
new file mode 100644
index 0000000000..0b8afe0f25
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/chrome.toml
@@ -0,0 +1,37 @@
+[DEFAULT]
+support-files = [
+  "external_importMap.js",
+  "insert_a_base_element.js",
+  "module_simpleImportMap.mjs",
+  "module_simpleImportMap_dir.mjs",
+  "module_simpleImportMap_remap.mjs",
+  "module_simpleImportMap_remap_https.mjs",
+  "module_simpleExport.mjs",
+  "module_sortedImportMap.mjs",
+  "scope1/module_simpleExport.mjs",
+  "scope1/module_simpleImportMap.mjs",
+  "scope1/scope2/module_simpleExport.mjs",
+  "scope1/scope2/module_simpleImportMap.mjs",
+]
+
+["test_dynamic_import_reject_importMap.html"]
+
+["test_externalImportMap.html"]
+
+["test_import_meta_resolve_importMap.html"]
+
+["test_inline_module_reject_importMap.html"]
+
+["test_load_importMap_with_base.html"]
+
+["test_load_importMap_with_base2.html"]
+
+["test_module_script_reject_importMap.html"]
+
+["test_parse_importMap_failed.html"]
+
+["test_reject_multiple_importMaps.html"]
+
+["test_simpleImportMap.html"]
+
+["test_sortedImportMap.html"]
diff --git a/dom/base/test/jsmodules/importmaps/circular_dependency.mjs b/dom/base/test/jsmodules/importmaps/circular_dependency.mjs
new file mode 100644
index 0000000000..f28d24b75e
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/circular_dependency.mjs
@@ -0,0 +1,6 @@
+// Should be remapped to good/module_3.mjs.
+import { exportedFunction } from "./bad/module_3.mjs";
+
+if (exportedFunction()) {
+  success("circular_dependency.mjs");
+}
diff --git a/dom/base/test/jsmodules/importmaps/external_importMap.js b/dom/base/test/jsmodules/importmaps/external_importMap.js
new file mode 100644
index 0000000000..e89d9f618f
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/external_importMap.js
@@ -0,0 +1,5 @@
+let imap = {
+  imports: {
+    foo: "./foo.js",
+  },
+};
diff --git a/dom/base/test/jsmodules/importmaps/good/module_0.mjs b/dom/base/test/jsmodules/importmaps/good/module_0.mjs
new file mode 100644
index 0000000000..5c3c5e2ab1
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/good/module_0.mjs
@@ -0,0 +1 @@
+success("good/module_0.mjs");
diff --git a/dom/base/test/jsmodules/importmaps/good/module_1.mjs b/dom/base/test/jsmodules/importmaps/good/module_1.mjs
new file mode 100644
index 0000000000..9b902b266a
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/good/module_1.mjs
@@ -0,0 +1 @@
+success("good/module_1.mjs");
diff --git a/dom/base/test/jsmodules/importmaps/good/module_2.mjs b/dom/base/test/jsmodules/importmaps/good/module_2.mjs
new file mode 100644
index 0000000000..6756465905
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/good/module_2.mjs
@@ -0,0 +1 @@
+success("good/module_2.mjs");
diff --git a/dom/base/test/jsmodules/importmaps/good/module_3.mjs b/dom/base/test/jsmodules/importmaps/good/module_3.mjs
new file mode 100644
index 0000000000..95450e55f7
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/good/module_3.mjs
@@ -0,0 +1,6 @@
+// eslint-disable-next-line import/no-unassigned-import
+import {} from "../circular_dependency.mjs";
+
+export function exportedFunction() {
+  return true;
+}
diff --git a/dom/base/test/jsmodules/importmaps/good/module_4.mjs b/dom/base/test/jsmodules/importmaps/good/module_4.mjs
new file mode 100644
index 0000000000..eaec9eb760
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/good/module_4.mjs
@@ -0,0 +1 @@
+success("good/module_4.mjs");
diff --git a/dom/base/test/jsmodules/importmaps/good/module_7.mjs b/dom/base/test/jsmodules/importmaps/good/module_7.mjs
new file mode 100644
index 0000000000..6603e1300d
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/good/module_7.mjs
@@ -0,0 +1 @@
+success("good/module_7.mjs");
diff --git a/dom/base/test/jsmodules/importmaps/insert_a_base_element.js b/dom/base/test/jsmodules/importmaps/insert_a_base_element.js
new file mode 100644
index 0000000000..435af97d1e
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/insert_a_base_element.js
@@ -0,0 +1,4 @@
+const el = document.createElement("base");
+el.href =
+  "chrome://mochitests/content/chrome/dom/base/test/jsmodules/importmaps/scope1/";
+document.currentScript.after(el);
diff --git a/dom/base/test/jsmodules/importmaps/mochitest.toml b/dom/base/test/jsmodules/importmaps/mochitest.toml
new file mode 100644
index 0000000000..4229455722
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/mochitest.toml
@@ -0,0 +1,33 @@
+[DEFAULT]
+support-files = [
+  "bug_1865410_module_a.mjs",
+  "bug_1865410_module_b.mjs",
+  "bug_1873417.mjs",
+  "module_importMap_with_external_script_0.mjs",
+  "module_importMap_with_external_script_1.mjs",
+  "module_importMap_with_external_script_2.mjs",
+  "module_importMap_with_external_script_3.mjs",
+  "module_importMap_with_external_script_4.mjs",
+  "module_importMap_with_external_script_5.mjs",
+  "module_importMap_with_external_script_5.mjs^headers^",
+  "module_importMap_with_external_script_6.mjs",
+  "module_importMap_with_external_script_6.mjs^headers^",
+  "module_importMap_with_external_script_7.mjs",
+  "bad/module_2.mjs",
+  "bad/module_3.mjs",
+  "bad/module_4.mjs",
+  "bad/module_7.mjs",
+  "good/module_0.mjs",
+  "good/module_1.mjs",
+  "good/module_2.mjs",
+  "good/module_3.mjs",
+  "good/module_4.mjs",
+  "good/module_7.mjs",
+  "circular_dependency.mjs",
+]
+
+["test_bug_1865410.html"]
+
+["test_bug_1873417.html"]
+
+["test_importMap_with_external_script.html"]
diff --git a/dom/base/test/jsmodules/importmaps/module_importMap_with_external_script_0.mjs b/dom/base/test/jsmodules/importmaps/module_importMap_with_external_script_0.mjs
new file mode 100644
index 0000000000..e2ba9dee7e
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/module_importMap_with_external_script_0.mjs
@@ -0,0 +1,3 @@
+// Bareword specifier should be mapped to ./good/module_0.mjs.
+// eslint-disable-next-line import/no-unassigned-import, import/no-unresolved
+import {} from "bare";
diff --git a/dom/base/test/jsmodules/importmaps/module_importMap_with_external_script_1.mjs b/dom/base/test/jsmodules/importmaps/module_importMap_with_external_script_1.mjs
new file mode 100644
index 0000000000..9d763a678f
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/module_importMap_with_external_script_1.mjs
@@ -0,0 +1,3 @@
+// Missing file ./bad/module_1.mjs should be mapped to ./good/module_1.mjs.
+// eslint-disable-next-line import/no-unassigned-import, import/no-unresolved
+import {} from "./bad/module_1.mjs";
diff --git a/dom/base/test/jsmodules/importmaps/module_importMap_with_external_script_2.mjs b/dom/base/test/jsmodules/importmaps/module_importMap_with_external_script_2.mjs
new file mode 100644
index 0000000000..f0cb539a48
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/module_importMap_with_external_script_2.mjs
@@ -0,0 +1,3 @@
+// Existing file ./bad/module_2.mjs should be mapped to ./good/module_2.mjs.
+// eslint-disable-next-line import/no-unassigned-import
+import {} from "./bad/module_2.mjs";
diff --git a/dom/base/test/jsmodules/importmaps/module_importMap_with_external_script_3.mjs b/dom/base/test/jsmodules/importmaps/module_importMap_with_external_script_3.mjs
new file mode 100644
index 0000000000..851f6dc3bc
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/module_importMap_with_external_script_3.mjs
@@ -0,0 +1,3 @@
+// Existing file ./bad/module_3.mjs should be mapped to ./good/module_3.mjs.
+// eslint-disable-next-line import/no-unassigned-import
+import {} from "./bad/module_3.mjs";
diff --git a/dom/base/test/jsmodules/importmaps/module_importMap_with_external_script_4.mjs b/dom/base/test/jsmodules/importmaps/module_importMap_with_external_script_4.mjs
new file mode 100644
index 0000000000..8f46b73123
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/module_importMap_with_external_script_4.mjs
@@ -0,0 +1,3 @@
+// Existing file ./bad/module_4.mjs should be mapped to ./good/module_4.mjs.
+// eslint-disable-next-line import/no-unassigned-import
+import {} from "./bad/module_4.mjs";
diff --git a/dom/base/test/jsmodules/importmaps/module_importMap_with_external_script_5.mjs b/dom/base/test/jsmodules/importmaps/module_importMap_with_external_script_5.mjs
new file mode 100644
index 0000000000..ac814c5e83
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/module_importMap_with_external_script_5.mjs
@@ -0,0 +1,3 @@
+// Existing file ./bad/module_3.mjs should be mapped to ./good/module_3.mjs.
+//import {} from "./bad/module_3.mjs";
+throw "Error: script_5.mjs";
diff --git a/dom/base/test/jsmodules/importmaps/module_importMap_with_external_script_5.mjs^headers^ b/dom/base/test/jsmodules/importmaps/module_importMap_with_external_script_5.mjs^headers^
new file mode 100644
index 0000000000..4cbbbc283d
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/module_importMap_with_external_script_5.mjs^headers^
@@ -0,0 +1,2 @@
+HTTP 301 Moved Permanently
+Location: module_importMap_with_external_script_4.mjs
diff --git a/dom/base/test/jsmodules/importmaps/module_importMap_with_external_script_6.mjs b/dom/base/test/jsmodules/importmaps/module_importMap_with_external_script_6.mjs
new file mode 100644
index 0000000000..9e02aa6bf4
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/module_importMap_with_external_script_6.mjs
@@ -0,0 +1,3 @@
+// Existing file ./bad/module_3.mjs should be mapped to ./good/module_3.mjs.
+//import {} from "./bad/module_3.mjs";
+throw "Error: script_6.mjs";
diff --git a/dom/base/test/jsmodules/importmaps/module_importMap_with_external_script_6.mjs^headers^ b/dom/base/test/jsmodules/importmaps/module_importMap_with_external_script_6.mjs^headers^
new file mode 100644
index 0000000000..9f5e36c5a2
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/module_importMap_with_external_script_6.mjs^headers^
@@ -0,0 +1,2 @@
+HTTP 301 Moved Permanently
+Location: module_importMap_with_external_script_5.mjs
diff --git a/dom/base/test/jsmodules/importmaps/module_importMap_with_external_script_7.mjs b/dom/base/test/jsmodules/importmaps/module_importMap_with_external_script_7.mjs
new file mode 100644
index 0000000000..b602217da5
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/module_importMap_with_external_script_7.mjs
@@ -0,0 +1,3 @@
+// Existing file ./bad/module_7.mjs should be mapped to ./good/module_4.mjs.
+// eslint-disable-next-line import/no-unassigned-import
+import {} from "./bad/module_7.mjs";
diff --git a/dom/base/test/jsmodules/importmaps/module_simpleExport.mjs b/dom/base/test/jsmodules/importmaps/module_simpleExport.mjs
new file mode 100644
index 0000000000..9714d6d0ab
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/module_simpleExport.mjs
@@ -0,0 +1 @@
+export let x = 42;
diff --git a/dom/base/test/jsmodules/importmaps/module_simpleImportMap.mjs b/dom/base/test/jsmodules/importmaps/module_simpleImportMap.mjs
new file mode 100644
index 0000000000..2f7e649dce
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/module_simpleImportMap.mjs
@@ -0,0 +1,4 @@
+// eslint-disable-next-line import/no-unresolved
+import { x } from "simple";
+
+result = x;
diff --git a/dom/base/test/jsmodules/importmaps/module_simpleImportMap_dir.mjs b/dom/base/test/jsmodules/importmaps/module_simpleImportMap_dir.mjs
new file mode 100644
index 0000000000..3a8a2a63b8
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/module_simpleImportMap_dir.mjs
@@ -0,0 +1,4 @@
+// eslint-disable-next-line import/no-unresolved
+import { x } from "dir/module_simpleExport.mjs";
+
+result_dir = x + 1;
diff --git a/dom/base/test/jsmodules/importmaps/module_simpleImportMap_remap.mjs b/dom/base/test/jsmodules/importmaps/module_simpleImportMap_remap.mjs
new file mode 100644
index 0000000000..54d22e5a5c
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/module_simpleImportMap_remap.mjs
@@ -0,0 +1,4 @@
+// eslint-disable-next-line import/no-unresolved
+import { x } from "./module.mjs";
+
+result_remap = x + 2;
diff --git a/dom/base/test/jsmodules/importmaps/module_simpleImportMap_remap_https.mjs b/dom/base/test/jsmodules/importmaps/module_simpleImportMap_remap_https.mjs
new file mode 100644
index 0000000000..d9b82243b7
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/module_simpleImportMap_remap_https.mjs
@@ -0,0 +1,4 @@
+// eslint-disable-next-line import/no-unresolved
+import { x } from "https://example.com/module.mjs";
+
+result_remap_https = x + 3;
diff --git a/dom/base/test/jsmodules/importmaps/module_sortedImportMap.mjs b/dom/base/test/jsmodules/importmaps/module_sortedImportMap.mjs
new file mode 100644
index 0000000000..2b199ca272
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/module_sortedImportMap.mjs
@@ -0,0 +1,6 @@
+/* eslint-disable import/no-unresolved */
+import { x } from "scope1/scope2/module_simpleExport.mjs";
+import { x as y } from "scope1/scope2/scope3/scope4/module_simpleExport.mjs";
+
+sorted_result = x;
+sorted_result2 = y;
diff --git a/dom/base/test/jsmodules/importmaps/moz.build b/dom/base/test/jsmodules/importmaps/moz.build
new file mode 100644
index 0000000000..ca4ef002b0
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/moz.build
@@ -0,0 +1,9 @@
+# -*- 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_CHROME_MANIFESTS += ["chrome.toml"]
+
+MOCHITEST_MANIFESTS += ["mochitest.toml"]
diff --git a/dom/base/test/jsmodules/importmaps/scope1/module_simpleExport.mjs b/dom/base/test/jsmodules/importmaps/scope1/module_simpleExport.mjs
new file mode 100644
index 0000000000..e6b0ed1c0c
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/scope1/module_simpleExport.mjs
@@ -0,0 +1 @@
+export let x = 84;
diff --git a/dom/base/test/jsmodules/importmaps/scope1/module_simpleImportMap.mjs b/dom/base/test/jsmodules/importmaps/scope1/module_simpleImportMap.mjs
new file mode 100644
index 0000000000..a64a098b7b
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/scope1/module_simpleImportMap.mjs
@@ -0,0 +1,4 @@
+// eslint-disable-next-line import/no-unresolved
+import { x } from "simple";
+
+result_scope1 = x;
diff --git a/dom/base/test/jsmodules/importmaps/scope1/scope2/module_simpleExport.mjs b/dom/base/test/jsmodules/importmaps/scope1/scope2/module_simpleExport.mjs
new file mode 100644
index 0000000000..ba2bbae16b
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/scope1/scope2/module_simpleExport.mjs
@@ -0,0 +1 @@
+export let x = 126;
diff --git a/dom/base/test/jsmodules/importmaps/scope1/scope2/module_simpleImportMap.mjs b/dom/base/test/jsmodules/importmaps/scope1/scope2/module_simpleImportMap.mjs
new file mode 100644
index 0000000000..00819aefd1
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/scope1/scope2/module_simpleImportMap.mjs
@@ -0,0 +1,4 @@
+// eslint-disable-next-line import/no-unresolved
+import { x } from "simple";
+
+result_scope2 = x;
diff --git a/dom/base/test/jsmodules/importmaps/test_bug_1865410.html b/dom/base/test/jsmodules/importmaps/test_bug_1865410.html
new file mode 100644
index 0000000000..a59aba368d
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/test_bug_1865410.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Bug 1865410: Test interaction between speculative preload and import maps</title>
+
+<script src="/tests/SimpleTest/SimpleTest.js"></script>
+<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+
+<!-- Insert an import map after we have started preloading the modules. -->
+<div id="container"></div>
+<script>
+  let script = document.createElement("script");
+  script.type = "importmap";
+  script.textContent = "{}";
+  let container = document.getElementById("container");
+  container.appendChild(script);
+</script>
+
+<!-- Load the first module which will load the second via an import. -->
+<script type="module" src="bug_1865410_module_a.mjs" async></script>
+<script src="../../slow.sjs"></script>
+
+<!-- Load the second, already loaded module. -->
+<script type="module", src="bug_1865410_module_b.mjs"></script>
+
+<script>
+  ok(true, "Didn't crash");
+</script>
diff --git a/dom/base/test/jsmodules/importmaps/test_bug_1873417.html b/dom/base/test/jsmodules/importmaps/test_bug_1873417.html
new file mode 100644
index 0000000000..9ae689be3b
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/test_bug_1873417.html
@@ -0,0 +1,39 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Bug 1873417: Test if import-maps will block module script execution</title>
+
+<script src="/tests/SimpleTest/SimpleTest.js"></script>
+<script>
+   (function () {
+       const script = document.createElement('script');
+       script.type = 'importmap';
+       script.textContent = '{}';
+       document.head.appendChild(script);
+   }());
+</script>
+
+<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+
+<script>
+let hasError = false;
+var state;
+
+SimpleTest.waitForExplicitFinish();
+
+function scriptError() {
+  hasError = true;
+}
+
+function testLoaded() {
+  ok(!hasError, 'module script should be loaded');
+  info("state:" + state);
+  ok(state === "loaded", "'state' should be set to 'loaded'");
+  SimpleTest.finish();
+}
+
+</script>
+
+<body onload="testLoaded()">
+<script src="bug_1873417.mjs" type="module" onerror="scriptError()"></script>
+</body>
+
diff --git a/dom/base/test/jsmodules/importmaps/test_dynamic_import_reject_importMap.html b/dom/base/test/jsmodules/importmaps/test_dynamic_import_reject_importMap.html
new file mode 100644
index 0000000000..96744c9317
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/test_dynamic_import_reject_importMap.html
@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<head>
+  <meta charset=utf-8>
+  <title>Test import map should be rejected.</title>
+</head>
+<body onload='testLoaded()'>
+<script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+
+<!--There is a dynamic import before the import map tag, so the import map-->
+<!--cannot be accepted according to the spec.-->
+<!--And because the import map is rejected, so the module specifier-->
+<!--"./module_simpleExport.mjs" won't be remapped to-->
+<!--"./scope1/module_simpleExport.mjs".-->
+
+<script>
+  import("./module_simpleExport.mjs");
+</script>
+
+<script type="importmap" onerror='importMapError()'>
+{
+  "imports": {
+    "./module_simpleExport.mjs": "./scope1/module_simpleExport.mjs"
+  }
+}
+</script>
+
+<script>
+  SimpleTest.waitForExplicitFinish();
+
+  let hasError = false;
+  function importMapError() {
+    hasError = true;
+  }
+
+  function testLoaded() {
+    import("./module_simpleExport.mjs").then((ns) => {
+      ok(ns.x == 42, 'Check simple imported value result: ' + ns.x);
+      ok(hasError, "onerror of the import map should be called.");
+    }).catch((e) => {
+      ok(false, "throws " + e);
+    }).then(() => {
+      SimpleTest.finish();
+    });
+  }
+</script>
+</body>
diff --git a/dom/base/test/jsmodules/importmaps/test_externalImportMap.html b/dom/base/test/jsmodules/importmaps/test_externalImportMap.html
new file mode 100644
index 0000000000..1345f61947
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/test_externalImportMap.html
@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Test an external import map</title>
+<script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+
+<script>
+let gotMsg = false;
+let console = Cc["@mozilla.org/consoleservice;1"].getService(Ci.nsIConsoleService);
+let listener = {
+  QueryInterface: ChromeUtils.generateQI(["nsIConsoleListener"]),
+  observe(msg) {
+    info("console message:" + msg);
+    ok(msg.logLevel == Ci.nsIConsoleMessage.warn, "log level should be 'warn'.");
+    // The message will be localized, so we just test the strings won't be
+    // localized.
+    ok(msg.message.match(/<script type='importmap'>.*src/),
+       "The error message should contain \"<script type='importmap'>\"");
+    console.unregisterListener(this);
+    gotMsg = true;
+  }
+};
+console.registerListener(listener);
+</script>
+
+<!--Import maps spec doesn't clearly define the format of an external import map script.-->
+<script src="external_importMap.js" type="importmap" onload="scriptLoaded()" onerror="scriptError()"></script>
+
+<script>
+function testLoaded() {
+  SimpleTest.waitForExplicitFinish();
+  ok(gotMsg, "Should have got the console warning.");
+  SimpleTest.finish();
+}
+
+function scriptLoaded() {
+  ok(false, "Loading external import map script should have failed.");
+}
+
+function scriptError() {
+  ok(true, "Loading external import map script failed.");
+}
+</script>
+<body onload='testLoaded()'></body>
diff --git a/dom/base/test/jsmodules/importmaps/test_importMap_with_external_script.html b/dom/base/test/jsmodules/importmaps/test_importMap_with_external_script.html
new file mode 100644
index 0000000000..3b21003feb
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/test_importMap_with_external_script.html
@@ -0,0 +1,75 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<head>
+<title>Test speculative preload of external script doesn't conflict with import map</title>
+<script src="/tests/SimpleTest/SimpleTest.js"></script>
+<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+
+<!--
+    These tests check that speculative preloading, which could happen before
+    the import map is installed, doesn't load the wrong modules.
+-->
+
+<script type="importmap">
+  {
+    "imports": {
+      "bare": "./good/module_0.mjs",
+      "./bad/module_1.mjs": "./good/module_1.mjs",
+      "./bad/module_2.mjs": "./good/module_2.mjs",
+      "./bad/module_3.mjs": "./good/module_3.mjs",
+      "./bad/module_4.mjs": "./good/module_4.mjs",
+      "./bad/module_7.mjs": "./good/module_7.mjs"
+    }
+  }
+</script>
+
+<!--
+Test bareword import (not supported before import map installed).
+-->
+<script type="module" src="module_importMap_with_external_script_0.mjs"></script>
+
+<!--
+Test mapping from missing resource to existing resource (not found before
+import map installed).
+-->
+<script type="module" src="module_importMap_with_external_script_1.mjs"></script>
+
+<!--
+Test mapping from one existing resource to another (would load wrong resource before
+import map installed).
+-->
+<script type="module" src="module_importMap_with_external_script_2.mjs"></script>
+
+<!--
+Test mapping from one existing resource to another with circular dependency.
+-->
+<script type="module" src="module_importMap_with_external_script_3.mjs"></script>
+
+<!--
+Test with redirect, script_6.mjs -> script_5.mjs -> script_4.mjs.
+We redirect twice here, as sometimes one redirect can't reproduce the crash
+from bug 1835468.
+-->
+<script type="module" src="module_importMap_with_external_script_6.mjs"></script>
+
+<!--
+Test with async attribute
+-->
+<script type="module" async src="module_importMap_with_external_script_7.mjs"></script>
+
+<script>
+  SimpleTest.waitForExplicitFinish();
+
+  let passCount = 0;
+  const expectedCount = 6;
+
+  function success(name) {
+    ok(true, "Test passed, loaded " + name);
+    passCount++;
+    if (passCount == expectedCount) {
+      SimpleTest.finish();
+    }
+  }
+</script>
+<body></body>
diff --git a/dom/base/test/jsmodules/importmaps/test_import_meta_resolve_importMap.html b/dom/base/test/jsmodules/importmaps/test_import_meta_resolve_importMap.html
new file mode 100644
index 0000000000..5c81dd548e
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/test_import_meta_resolve_importMap.html
@@ -0,0 +1,49 @@
+<!DOCTYPE html>
+<head>
+  <meta charset=utf-8>
+  <title>Test import.meta.resolve with import maps</title>
+</head>
+<body onload='testLoaded()'>
+
+<script type="importmap">
+{
+  "imports": {
+    "simple": "./module_simpleExport.mjs"
+  }
+}
+</script>
+
+<script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+<script>
+  var wasRun = false;
+  var hasThrown = false;
+  window.onerror = handleError;
+
+  function handleError(msg, url, line, col, error) {
+    ok(error instanceof TypeError, "Thrown error should be TypeError.");
+    hasThrown = true;
+  }
+</script>
+
+<script type="module">
+  ok(import.meta.resolve("simple") ==
+     "chrome://mochitests/content/chrome/dom/base/test/jsmodules/importmaps/module_simpleExport.mjs",
+     "calling import.meta.resolve with a specifier from import map.");
+  wasRun = true;
+</script>
+
+<script type="module">
+  // should throw a TypeError
+  import.meta.resolve("fail");
+</script>
+
+<script>
+  SimpleTest.waitForExplicitFinish();
+
+  function testLoaded() {
+    ok(wasRun, "Check inline module has run.");
+    ok(hasThrown, "Check inline module has thrown.");
+    SimpleTest.finish();
+  }
+</script>
+</body>
diff --git a/dom/base/test/jsmodules/importmaps/test_inline_module_reject_importMap.html b/dom/base/test/jsmodules/importmaps/test_inline_module_reject_importMap.html
new file mode 100644
index 0000000000..458601619a
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/test_inline_module_reject_importMap.html
@@ -0,0 +1,61 @@
+<!DOCTYPE html>
+<head>
+  <meta charset=utf-8>
+  <title>Test import map should be rejected.</title>
+</head>
+<body onload='testLoaded()'>
+<script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+
+<script>
+let gotMsg = false;
+let console = Cc["@mozilla.org/consoleservice;1"].getService(Ci.nsIConsoleService);
+let listener = {
+  QueryInterface: ChromeUtils.generateQI(["nsIConsoleListener"]),
+  observe(msg) {
+    info("console message:" + msg);
+    ok(msg.logLevel == Ci.nsIConsoleMessage.warn, "log level should be 'warn'.");
+    console.unregisterListener(this);
+    gotMsg = true;
+  }
+};
+console.registerListener(listener);
+</script>
+
+<!--There is an inline module before the import map tag, so the import map-->
+<!--cannot be accepted according to the spec.-->
+<!--And because the import map is rejected, so the module specifier-->
+<!--"./module_simpleExport.mjs" won't be remapped to-->
+<!--"./scope1/module_simpleExport.mjs".-->
+
+<script type="module">
+</script>
+
+<script type="importmap" onerror='importMapError()'>
+{
+  "imports": {
+    "./module_simpleExport.mjs": "./scope1/module_simpleExport.mjs"
+  }
+}
+</script>
+
+<script>
+  SimpleTest.waitForExplicitFinish();
+
+  let hasError = false;
+  function importMapError() {
+    hasError = true;
+  }
+
+  function testLoaded() {
+    import("./module_simpleExport.mjs").then((ns) => {
+      ok(ns.x == 42, 'Check simple imported value result: ' + ns.x);
+      ok(hasError, "onerror of the import map should be called.");
+      ok(gotMsg, "Should have got the console warning.");
+    }).catch((e) => {
+      ok(false, "throws " + e);
+    }).then(() => {
+      SimpleTest.finish();
+    });
+  }
+</script>
+</body>
diff --git a/dom/base/test/jsmodules/importmaps/test_load_importMap_with_base.html b/dom/base/test/jsmodules/importmaps/test_load_importMap_with_base.html
new file mode 100644
index 0000000000..531431fcf0
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/test_load_importMap_with_base.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html>
+<head>
+  <meta charset=utf-8>
+  <title>Test a simple import map with a base element</title>
+</head>
+<body onload='testLoaded()'>
+
+<!--  This will change the baseURL of the document.-->
+<base href="chrome://mochitests/content/chrome/dom/base/test/jsmodules/importmaps/scope1/">
+
+<!--
+With the <base> element, the correct "module_simpleExport.mjs" should be mapped
+to "scope1/module_simpleExport.mjs", instead of "./module_simpleExport.mjs".
+-->
+
+<script type="importmap">
+{
+  "imports": {
+    "simple": "./module_simpleExport.mjs"
+  }
+}
+</script>
+
+<script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+
+<script type="module">
+  import { x } from "simple";
+  result2 = x;
+</script>
+
+<script type="module" src="module_simpleImportMap.mjs"></script>
+
+<script>
+  var result_scope1, result2;
+
+  SimpleTest.waitForExplicitFinish();
+
+  function testLoaded() {
+    ok(result_scope1 == 84, 'Check imported value result_scope1: ' + result_scope1);
+    ok(result2 == 84, 'Check imported value result2: ' + result2);
+
+    import("simple").then((ns) => {
+      ok(ns.x == 84, 'Check simple imported value result: ' + ns.x);
+    }).catch((e) => {
+      ok(false, "throws " + e);
+    }).then(() => {
+      SimpleTest.finish();
+    });
+  }
+</script>
+</body>
diff --git a/dom/base/test/jsmodules/importmaps/test_load_importMap_with_base2.html b/dom/base/test/jsmodules/importmaps/test_load_importMap_with_base2.html
new file mode 100644
index 0000000000..7ab3fe96da
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/test_load_importMap_with_base2.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html>
+<head>
+  <meta charset=utf-8>
+  <title>Test a simple import map with a script creates a base element</title>
+</head>
+<body onload='testLoaded()'>
+
+<!--This script will create a base element.-->
+<script src="insert_a_base_element.js"></script>
+
+<!--
+With the <base> element, the correct "module_simpleExport.mjs" should be mapped
+to "scope1/module_simpleExport.mjs", instead of "./module_simpleExport.mjs".
+-->
+
+<script type="importmap">
+{
+  "imports": {
+    "simple": "./module_simpleExport.mjs"
+  }
+}
+</script>
+
+<script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+
+<script type="module">
+  import { x } from "simple";
+  result2 = x;
+</script>
+
+<script type="module" src="module_simpleImportMap.mjs"></script>
+
+<script>
+  var result_scope1, result2;
+
+  SimpleTest.waitForExplicitFinish();
+
+  function testLoaded() {
+    ok(result_scope1 == 84, 'Check imported value result_scope1: ' + result_scope1);
+    ok(result2 == 84, 'Check imported value result2: ' + result2);
+
+    import("simple").then((ns) => {
+      ok(ns.x == 84, 'Check simple imported value result: ' + ns.x);
+    }).catch((e) => {
+      ok(false, "throws " + e);
+    }).then(() => {
+      SimpleTest.finish();
+    });
+  }
+</script>
+</body>
diff --git a/dom/base/test/jsmodules/importmaps/test_module_script_reject_importMap.html b/dom/base/test/jsmodules/importmaps/test_module_script_reject_importMap.html
new file mode 100644
index 0000000000..88db016e3d
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/test_module_script_reject_importMap.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<head>
+  <meta charset=utf-8>
+  <title>Test import map should be rejected.</title>
+</head>
+<body onload='testLoaded()'>
+<script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+
+<!--There is a module load before the import map tag, so the import map cannot-->
+<!--be accepted according to the spec.-->
+<!--And because the import map is rejected, so the module specifier-->
+<!--"./module_simpleExport.mjs" won't be remapped to-->
+<!--"./scope1/module_simpleExport.mjs".-->
+
+<script src="./module_simpleExport.mjs" type="module">
+</script>
+
+<script type="importmap" onerror='importMapError()'>
+{
+  "imports": {
+    "./module_simpleExport.mjs": "./scope1/module_simpleExport.mjs"
+  }
+}
+</script>
+
+<script>
+  SimpleTest.waitForExplicitFinish();
+
+  let hasError = false;
+  function importMapError() {
+    hasError = true;
+  }
+
+  function testLoaded() {
+    import("./module_simpleExport.mjs").then((ns) => {
+      ok(ns.x == 42, 'Check simple imported value result: ' + ns.x);
+      ok(hasError, "onerror of the import map should be called.");
+    }).catch((e) => {
+      ok(false, "throws " + e);
+    }).then(() => {
+      SimpleTest.finish();
+    });
+  }
+</script>
+</body>
diff --git a/dom/base/test/jsmodules/importmaps/test_parse_importMap_failed.html b/dom/base/test/jsmodules/importmaps/test_parse_importMap_failed.html
new file mode 100644
index 0000000000..b304acd943
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/test_parse_importMap_failed.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<head>
+  <meta charset=utf-8>
+  <title>Test the error message when parsing import maps failed</title>
+</head>
+<body onload='testLoaded()'>
+<script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+
+<script>
+let gotMsg = false;
+window.onerror = function(event, src, lineno, colno, error) {
+  info("error: " + error.message);
+  ok(error instanceof SyntaxError, "error should be SyntaxError.");
+  ok(error.message.match(/import map/),
+     "error.message should contain 'import map'");
+  gotMsg = true;
+};
+</script>
+
+<!--
+An import map with invalid JSON format. A SyntaxError will be thrown when parsing
+the import map.
+ -->
+<script type="importmap" onerror='importMapError()'>
+{
+  "imports": {{
+    "foo": "./foo.js"
+  }
+}
+</script>
+
+<script>
+  SimpleTest.waitForExplicitFinish();
+
+  function testLoaded() {
+    ok(gotMsg, "Should have thrown a SyntaxError.");
+    SimpleTest.finish();
+  }
+</script>
+</body>
diff --git a/dom/base/test/jsmodules/importmaps/test_reject_multiple_importMaps.html b/dom/base/test/jsmodules/importmaps/test_reject_multiple_importMaps.html
new file mode 100644
index 0000000000..2a3498094c
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/test_reject_multiple_importMaps.html
@@ -0,0 +1,64 @@
+<!DOCTYPE html>
+<head>
+  <meta charset=utf-8>
+  <title>Test the 2nd import map should be rejected.</title>
+</head>
+<body onload='testLoaded()'>
+<script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+
+<script>
+let gotMsg = false;
+let console = Cc["@mozilla.org/consoleservice;1"].getService(Ci.nsIConsoleService);
+let listener = {
+  QueryInterface: ChromeUtils.generateQI(["nsIConsoleListener"]),
+  observe(msg) {
+    info("console message:" + msg);
+    ok(msg.logLevel == Ci.nsIConsoleMessage.warn, "log level should be 'warn'.");
+    console.unregisterListener(this);
+    gotMsg = true;
+  }
+};
+console.registerListener(listener);
+</script>
+
+<script type="importmap" onerror='importMapError1()'>
+{
+  "imports": {
+    "./module_simpleExport.mjs": "./scope1/module_simpleExport.mjs"
+  }
+}
+</script>
+
+<!--The 2nd import map should be rejected.-->
+<script type="importmap" onerror='importMapError2()'>
+{
+  "imports": {
+    "./module_simpleExport.mjs": "./scope1/module_simpleExport.mjs"
+  }
+}
+</script>
+
+<script>
+  SimpleTest.waitForExplicitFinish();
+
+  let hasError = false;
+  function importMapError1() {
+    ok(false, "The first import map should be accepted.");
+  }
+  function importMapError2() {
+    hasError = true;
+  }
+
+  function testLoaded() {
+    import("./module_simpleExport.mjs").then((ns) => {
+      ok(ns.x == 84, 'Check simple imported value result: ' + ns.x);
+      ok(hasError, "onerror of the import map should be called.");
+      ok(gotMsg, "Should have got the console warning.");
+    }).catch((e) => {
+      ok(false, "throws " + e);
+    }).then(() => {
+      SimpleTest.finish();
+    });
+  }
+</script>
+</body>
diff --git a/dom/base/test/jsmodules/importmaps/test_simpleImportMap.html b/dom/base/test/jsmodules/importmaps/test_simpleImportMap.html
new file mode 100644
index 0000000000..5323da31a9
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/test_simpleImportMap.html
@@ -0,0 +1,62 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Test a simple import map</title>
+<script type="importmap">
+{
+  "imports": {
+    "simple": "./module_simpleExport.mjs",
+    "dir/": "/content/chrome/dom/base/test/jsmodules/importmaps/",
+    "./module.mjs": "/content/chrome/dom/base/test/jsmodules/importmaps/module_simpleExport.mjs",
+    "https://example.com/module.mjs": "./module_simpleExport.mjs"
+  },
+  "scopes": {
+    "chrome://mochitests/content/chrome/dom/base/test/jsmodules/importmaps/scope1/": {
+      "simple": "/content/chrome/dom/base/test/jsmodules/importmaps/scope1/module_simpleExport.mjs"
+    },
+    "chrome://mochitests/content/chrome/dom/base/test/jsmodules/importmaps/scope1/scope2/": {
+      "simple": "/content/chrome/dom/base/test/jsmodules/importmaps/scope1/scope2/module_simpleExport.mjs"
+    }
+  }
+}
+</script>
+
+<script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+
+<script>
+  var result, result_dir, result_remap, result_remap_https;
+  var result_scope1, result_scope2;
+
+  SimpleTest.waitForExplicitFinish();
+
+  function testLoaded() {
+    ok(result == 42, 'Check imported value result: ' + result);
+    ok(result_dir == 43, 'Check imported value result_dir: ' + result_dir);
+    ok(result_remap == 44, 'Check imported value result_remap: ' + result_remap);
+    ok(result_remap_https == 45,
+       'Check imported value result_remap_https: ' + result_remap_https);
+    ok(result_scope1 == 84, 'Check imported value result_scope1: ' + result_scope1);
+    ok(result_scope2 == 126, 'Check imported value result_scope2: ' + result_scope2);
+
+    import("simple").then((ns) => {
+      ok(ns.x == 42, 'Check simple imported value result: ' + ns.x);
+      return import("dir/module_simpleExport.mjs");
+    }).then((ns) => {
+      ok(ns.x == 42, 'Check dir imported value result: ' + ns.x);
+      return import("./module.mjs");
+    }).then((ns) => {
+      ok(ns.x == 42, 'Check remap imported value result: ' + ns.x);
+      return import("https://example.com/module.mjs");
+    }).then((ns) => {
+      ok(ns.x == 42, 'Check remap https imported value result: ' + ns.x);
+      SimpleTest.finish();
+    });
+  }
+</script>
+<script type="module" src="module_simpleImportMap.mjs"></script>
+<script type="module" src="module_simpleImportMap_dir.mjs"></script>
+<script type="module" src="module_simpleImportMap_remap.mjs"></script>
+<script type="module" src="module_simpleImportMap_remap_https.mjs"></script>
+<script type="module" src="module_simpleImportMap_remap_https.mjs"></script>
+<script type="module" src="scope1/module_simpleImportMap.mjs"></script>
+<script type="module" src="scope1/scope2/module_simpleImportMap.mjs"></script>
+<body onload='testLoaded()'></body>
diff --git a/dom/base/test/jsmodules/importmaps/test_sortedImportMap.html b/dom/base/test/jsmodules/importmaps/test_sortedImportMap.html
new file mode 100644
index 0000000000..f4b98fdf10
--- /dev/null
+++ b/dom/base/test/jsmodules/importmaps/test_sortedImportMap.html
@@ -0,0 +1,62 @@
+<!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>
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