[Partitioned Popins] The popin cannot open popins

We disallow this in the renderer/browser as it would cause issues with the way modal popups work. Explainer: https://explainers-by-googlers.github.io/partitioned-popins/ I2P: https://groups.google.com/a/chromium.org/g/blink-dev/c/ApU_zUmpQ2g/ Bug: 340606651 Change-Id: Ib6bac72db4ff3c48038c0e92c7fecb9d3b624ea8 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5816450 Commit-Queue: Ari Chivukula <arichiv@chromium.org> Reviewed-by: Nasko Oskov <nasko@chromium.org> Reviewed-by: Philip Rogers <pdr@chromium.org> Auto-Submit: Ari Chivukula <arichiv@chromium.org> Commit-Queue: Nasko Oskov <nasko@chromium.org> Cr-Commit-Position: refs/heads/main@{#1348976}
web-platform-tests · Aug 30, 2024 · a97e8f7 · a97e8f7
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diff --git a/partitioned-popins/partitioned-popins.recursive.tentative.https.window.js b/partitioned-popins/partitioned-popins.recursive.tentative.https.window.js
@@ -0,0 +1,26 @@
+// META: script=/resources/testdriver.js
+// META: script=/resources/testdriver-vendor.js
+
+'use strict';
+
+// Spec: https://explainers-by-googlers.github.io/partitioned-popins/
+// Step 1 (window) Set up listener to resolve messages as they come in.
+// Step 2 (window) Open popin.
+// Step 3 (popin) Try to open popin and report failure.
+// Step 4 (main-window) Cleanup.
+
+async_test(t => {
+  // Step 1
+  window.addEventListener("message", t.step_func(e => {
+    switch (e.data.type) {
+      case 'popin':
+        // Step 4
+        assert_equals(e.data.message, "Could not open inner popin");
+        t.done();
+        break;
+    }
+  }));
+
+  // Step 2
+  window.open("/partitioned-popins/resources/partitioned-popins.recursive.html", '_blank', 'popin');
+}, "Verify Partitioned Popins cannot open their own popin");
diff --git a/partitioned-popins/resources/partitioned-popins.recursive.html b/partitioned-popins/resources/partitioned-popins.recursive.html
@@ -0,0 +1,18 @@
+<!doctype html>
+<meta charset="utf-8">
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script>
+(async function() {
+  test_driver.set_test_context(window.opener);
+
+  // Step 3 (partitioned-popins/partitioned-popins.recursive.tentative.sub.https.window.js)
+  let message = "Could not open inner popin";
+  try {
+    window.open("/partitioned-popins/resources/partitioned-popins.close.html", '_blank', 'popin');
+    message = "Did open inner popin";
+  } catch (_) {}
+  window.opener.postMessage({type: "popin", message: message}, "*");
+  window.close();
+})();
+</script>