1 files changed, 75 insertions, 0 deletions
diff --git a/testing/web-platform/tests/fetch/data-urls/navigate.window.js b/testing/web-platform/tests/fetch/data-urls/navigate.window.js
new file mode 100644
index 0000000000..b532a00683
--- /dev/null
+++ b/testing/web-platform/tests/fetch/data-urls/navigate.window.js
@@ -0,0 +1,75 @@
+// META: timeout=long
+//
+// Test some edge cases around navigation to data: URLs to ensure they use the same code path
+
+[
+  {
+    input: "data:text/html,<script>parent.postMessage(1, '*')</script>",
+    result: 1,
+    name: "Nothing fancy",
+  },
+  {
+    input: "data:text/html;base64,PHNjcmlwdD5wYXJlbnQucG9zdE1lc3NhZ2UoMiwgJyonKTwvc2NyaXB0Pg==",
+    result: 2,
+    name: "base64",
+  },
+  {
+    input: "data:text/html;base64,PHNjcmlwdD5wYXJlbnQucG9zdE1lc3NhZ2UoNCwgJyonKTwvc2NyaXB0Pr+/",
+    result: 4,
+    name: "base64 with code points that differ from base64url"
+  },
+  {
+    input: "data:text/html;base64,PHNjcml%09%20%20%0A%0C%0DwdD5wYXJlbnQucG9zdE1lc3NhZ2UoNiwgJyonKTwvc2NyaXB0Pg==",
+    result: 6,
+    name: "ASCII whitespace in the input is removed"
+  }
+].forEach(({ input, result, name }) => {
+  // Use promise_test so they go sequentially
+  promise_test(async t => {
+    const event = await new Promise((resolve, reject) => {
+      self.addEventListener("message", t.step_func(resolve), { once: true });
+      const frame = document.body.appendChild(document.createElement("iframe"));
+      t.add_cleanup(() => frame.remove());
+
+      // The assumption is that postMessage() is quicker
+      t.step_timeout(reject, 500);
+      frame.src = input;
+    });
+    assert_equals(event.data, result);
+  }, name);
+});
+
+// Failure cases
+[
+  {
+    input: "data:text/html;base64,PHNjcmlwdD5wYXJlbnQucG9zdE1lc3NhZ2UoMywgJyonKTwvc2NyaXB0Pg=",
+    name: "base64 with incorrect padding",
+  },
+  {
+    input: "data:text/html;base64,PHNjcmlwdD5wYXJlbnQucG9zdE1lc3NhZ2UoNSwgJyonKTwvc2NyaXB0Pr-_",
+    name: "base64url is not supported"
+  },
+  {
+    input: "data:text/html;base64,%0BPHNjcmlwdD5wYXJlbnQucG9zdE1lc3NhZ2UoNywgJyonKTwvc2NyaXB0Pg==",
+    name: "Vertical tab in the input leads to an error"
+  }
+].forEach(({ input, name }) => {
+  // Continue to use promise_test so they go sequentially
+  promise_test(async t => {
+    const event = await new Promise((resolve, reject) => {
+      self.addEventListener("message", t.step_func(reject), { once: true });
+      const frame = document.body.appendChild(document.createElement("iframe"));
+      t.add_cleanup(() => frame.remove());
+
+      // The assumption is that postMessage() is quicker
+      t.step_timeout(resolve, 500);
+      frame.src = input;
+    });
+  }, name);
+});
+
+// I found some of the interesting code point cases above through brute force:
+//
+// for (i = 0; i < 256; i++) {
+//   w(btoa("<script>parent.postMessage(5, '*')<\/script>" + String.fromCodePoint(i) + String.fromCodePoint(i)));
+// }