1 files changed, 33 insertions, 0 deletions
diff --git a/testing/web-platform/tests/url/percent-encoding.window.js b/testing/web-platform/tests/url/percent-encoding.window.js
new file mode 100644
index 0000000000..dcb5c1e55b
--- /dev/null
+++ b/testing/web-platform/tests/url/percent-encoding.window.js
@@ -0,0 +1,33 @@
+promise_test(() => fetch("resources/percent-encoding.json").then(res => res.json()).then(runTests), "Loading data…");
+
+function runTests(testUnits) {
+  for (const testUnit of testUnits) {
+    // Ignore comments
+    if (typeof testUnit === "string") {
+      continue;
+    }
+    for (const encoding of Object.keys(testUnit.output)) {
+      async_test(t => {
+        const frame = document.body.appendChild(document.createElement("iframe"));
+        t.add_cleanup(() => frame.remove());
+        frame.onload = t.step_func_done(() => {
+          const output = frame.contentDocument.querySelector("a");
+          // Test that the fragment is always UTF-8 encoded
+          assert_equals(output.hash, `#${testUnit.output["utf-8"]}`, "fragment");
+          assert_equals(output.search, `?${testUnit.output[encoding]}`, "query");
+        });
+        frame.src = `resources/percent-encoding.py?encoding=${encoding}&value=${toBase64(testUnit.input)}`;
+      }, `Input ${testUnit.input} with encoding ${encoding}`);
+    }
+  }
+}
+
+// Use base64 to avoid relying on the URL parser to get UTF-8 percent-encoding correctly. This does
+// not use btoa directly as that only works with code points in the range U+0000 to U+00FF,
+// inclusive.
+function toBase64(input) {
+  const bytes = new TextEncoder().encode(input);
+  const byteString = Array.from(bytes, byte => String.fromCharCode(byte)).join("");
+  const encoded = self.btoa(byteString);
+  return encoded;
+}