1 files changed, 40 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/iframe_remove_src.html b/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/iframe_remove_src.html
new file mode 100644
index 0000000000..f0ff9ff508
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/iframe_remove_src.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Test that removing the src attribute of an iframe loads about:blank
+  instead of whatever was loaded previously.</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<body>
+  <script>
+    var iframe;
+    var t = async_test();
+    t.step(setupFrame);
+
+    function setupFrame() {
+      iframe = document.createElement("iframe");
+      iframe.src = URL.createObjectURL(new Blob(["text"], { type: "text/html" }));
+      iframe.onload = t.step_func(blobLoaded);
+      document.body.appendChild(iframe);
+    }
+
+    var removalRunning = false;
+    function blobLoaded() {
+      assert_equals(iframe.contentDocument.location.protocol, "blob:",
+                    "Should have loaded the blob");
+      assert_equals(iframe.contentDocument.documentElement.textContent, "text",
+                    "Should have loaded the blob text");
+      iframe.onload = t.step_func_done(aboutBlankLoaded);
+      removalRunning = true;
+      iframe.removeAttribute("src");
+      removalRunning = false;
+    }
+
+    function aboutBlankLoaded() {
+      assert_false(removalRunning, "Should not have loaded about:blank sync");
+      assert_equals(iframe.contentDocument.location.href, "about:blank",
+                    "Should have loaded about:blank");
+      assert_equals(iframe.contentDocument.documentElement.textContent, "",
+                    "Should have loaded the about:blank text");
+    }
+  </script>
+</body>