Add second WPT test for new base url behavior.

This CL adds a test that ensures a srcdoc frame's base url doesn't change when it's restored from session history. Bug: 1356658 Change-Id: Iae1c038d14750804f93b2d9efedda22be2c0a1f3 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4193426 Commit-Queue: James Maclean <[email protected]> Reviewed-by: Domenic Denicola <[email protected]> Cr-Commit-Position: refs/heads/main@{#1097898}
web-platform-tests · Jan 27, 2023 · 06adeef · 06adeef
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diff --git a/...cture/urls/terminology-0/document-base-url-changes-after-nav-about-srcdoc.https.window.js b/...cture/urls/terminology-0/document-base-url-changes-after-nav-about-srcdoc.https.window.js
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+// META: script=/common/get-host-info.sub.js
+//
+// A test to verify that, when a srcdoc frame is created when it's parent
+// has a non-default base URI, and is later restored from history, it has
+// the same baseURI it started with, even if the parent has changed its own
+// baseURI in the meantime.
+// The parent always communicates with the child via postMessage since some
+// of the test cases include the child being sandboxed.
+
+async function sendMessage(frame, msg) {
+  const result = new Promise(r => onmessage = e => r(e.data));
+  frame.postMessage(msg, "*");
+  return await result;
+}
+
+const runTest = (description, sandbox_flags) => {
+  promise_test(async test => {
+    const original_parent_baseURI = document.baseURI;
+    // Create a URL for the child frame to navigate to.
+    const nav_target =
+        (new URL('./resources/send-back-base-url.html', location.href)).href;
+
+    // Change parent to a non-default baseURI.
+    const base_element = document.createElement("base");
+    base_element.href = get_host_info().REMOTE_ORIGIN;
+    document.head.appendChild(base_element);
+    assert_not_equals(document.baseURI, original_parent_baseURI,
+        "parent baseURI failed to change.");
+    const non_default_parent_baseURI = document.baseURI;
+
+    // Create child and load a srcdoc frame.
+    const iframe = document.createElement("iframe");
+    if (sandbox_flags !== null)
+      iframe.sandbox = sandbox_flags;
+    iframe.srcdoc = `
+      <head>
+      <script>
+        addEventListener('message', (event) => {
+          if (event.data == 'report baseURI')
+            event.source.postMessage(document.baseURI, event.origin);
+          if (event.data == 'click link')
+            document.getElementById('link').click();
+        });
+        parent.postMessage('loaded', '*');
+      </scr`+`ipt>
+      </head>
+      <body>
+      <a id='link' href='` + nav_target+ `'>link</a>
+      </body>
+    `;
+
+    const child_loaded = new Promise(r => onmessage = e => r(e.data));
+    document.body.appendChild(iframe);
+    assert_equals(await child_loaded, "loaded");
+
+    // Verify child's baseURI matches parent.
+    const child_base_uri = await sendMessage(frames[0], "report baseURI");
+    assert_equals(child_base_uri, non_default_parent_baseURI);
+
+    // Navigate child frame to non-srcdoc.
+    const child_loaded2 = await sendMessage(frames[0], "click link");
+    assert_equals(child_loaded2, "loaded");
+    const child_base_uri2 = await sendMessage(frames[0], "report baseURI");
+    assert_not_equals(child_base_uri2, non_default_parent_baseURI);
+    assert_not_equals(child_base_uri2, original_parent_baseURI);
+    assert_equals(child_base_uri2, nav_target);
+
+    // Parent resets its baseURI.
+    base_element.remove();
+    assert_equals(document.baseURI, original_parent_baseURI,
+        "parent baseURI failed to reset.");
+
+    // Navigate child back and verify its baseURI didn't change.
+    const child_loaded3 = new Promise(r => onmessage = e => r(e.data));
+    window.history.back();
+    assert_equals(await child_loaded3, "loaded");
+    const child_base_uri3 = await sendMessage(frames[0], "report baseURI");
+    assert_equals(child_base_uri3, non_default_parent_baseURI);
+  }, description);
+}
+
+runTest("non-sandboxed srcdoc - parent changes baseURI",null);
+runTest("sandboxed srcdoc - parent changes baseURI", "allow-scripts");
diff --git a/html/infrastructure/urls/terminology-0/resources/send-back-base-url.html b/html/infrastructure/urls/terminology-0/resources/send-back-base-url.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<script>
+  addEventListener('message', (event) => {
+    if (event.data == 'report baseURI')
+      event.source.postMessage(document.baseURI, event.origin);
+  });
+  parent.postMessage('loaded', '*');
+</script>