1 files changed, 58 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/module/dynamic-import/gamma/base-url.sub.js b/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/module/dynamic-import/gamma/base-url.sub.js
new file mode 100644
index 0000000000..ec7784983d
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/module/dynamic-import/gamma/base-url.sub.js
@@ -0,0 +1,58 @@
+"use strict";
+
+// This script triggers import(), and thus the base URL of this script
+// (either loaded by `<script>` or `importScripts()`) is used as the base URL
+// of resolving relative URL-like specifiers in `import()`.
+
+// The following fields should be set by the callers of this script
+// (unless loaded as the worker top-level script):
+// - self.testName (string)
+// - self.baseUrlSanitized (boolean)
+
+// When this script is loaded as the worker top-level script:
+if ('DedicatedWorkerGlobalScope' in self &&
+    self instanceof DedicatedWorkerGlobalScope &&
+    !self.testName) {
+  importScripts("/resources/testharness.js");
+  self.testName = 'worker top-level script';
+  // Worker top-level scripts are always same-origin.
+  self.baseUrlSanitized = false;
+}
+
+{
+  // This could change by the time the test is executed, so we save it now.
+  // As this script is loaded multiple times, savedBaseUrlSanitized is scoped.
+  const savedBaseUrlSanitized = self.baseUrlSanitized;
+
+  promise_test(() => {
+      const promise = import("./import.js?pipe=header(Access-Control-Allow-Origin,*)&label=relative-" + self.testName);
+      if (savedBaseUrlSanitized) {
+        // The base URL is "about:blank" and thus import() here should fail.
+        return promise.then(module => {
+            // This code should be unreached, but assert_equals() is used here
+            // to log `module.A["from"]` in case of unexpected resolution.
+            assert_equals(module.A["from"], "(unreached)",
+              "Relative URL-like specifier resolution should fail");
+            assert_unreached();
+          },
+          () => {});
+      } else {
+        // The base URL is the response URL of this script, i.e.
+        // `.../gamma/base-url.sub.js`.
+        return promise.then(module => {
+            assert_equals(module.A["from"], "gamma/import.js");
+          });
+      }
+    },
+    "Relative URL-like from " + self.testName);
+}
+
+promise_test(() => {
+    return import("http://{{hosts[alt][]}}:{{ports[http][0]}}/html/semantics/scripting-1/the-script-element/module/dynamic-import/gamma/import.js?pipe=header(Access-Control-Allow-Origin,*)&label=absolute-" + self.testName)
+      .then(module => {
+          assert_equals(module.A["from"], "gamma/import.js");
+        })
+  },
+  "Absolute URL-like from " + self.testName);
+
+done();