1 files changed, 29 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/browsers/sandboxing/sandbox-navigation-timing.tentative.html b/testing/web-platform/tests/html/browsers/sandboxing/sandbox-navigation-timing.tentative.html
new file mode 100644
index 0000000000..686f1c0c9f
--- /dev/null
+++ b/testing/web-platform/tests/html/browsers/sandboxing/sandbox-navigation-timing.tentative.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Sandbox Navigation Timing</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<html></html>
+<script>
+  const sandboxUrl = location.pathname.substring(0, location.pathname.lastIndexOf('/') + 1) + 'sandbox-navigation-timing-iframe.tentative.html';
+  async_test(t => {
+    const iframe = document.createElement('iframe');
+    iframe.src = sandboxUrl;
+    document.body.appendChild(iframe); // Navigation starts; value of sandbox flags locked on.
+    // This should not affect the sandbox value used for both about:blank document
+    // and the final document in iframe.
+    iframe.sandbox = 'allow-scripts';
+    const iframeAboutBlankDocument = iframe.contentDocument;
+
+    iframe.onload = t.step_func(() => {
+      const iframeAboutBlankContents = iframeAboutBlankDocument.querySelectorAll('body');
+      assert_equals(iframeAboutBlankContents[0].tagName, "BODY",
+        "about:blank document's contents should still be accessible");
+
+      iframe.contentWindow.postMessage("is iframe sandboxed?", "*");
+    });
+    window.onmessage = t.step_func_done(e => {
+      assert_equals(e.data.result, 'iframe not sandboxed');
+    });
+  }, 'setting sandbox attribute should not affect current document in iframe');
+</script>