Experiment with blocking script inside fragment-parser-inserted `<iframe srcdoc>`.

third_party/WebKit/Source/core/html/HTMLIFrameElementTest.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/html/HTMLIFrameElement.h"
 
 #include "core/dom/Document.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace blink {
 
 // Test setting via the Element attribute (HTML codepath).
 TEST(HTMLIFrameElementTest, SetPermissionsAttribute) {
   Document* document = Document::create();
-  HTMLIFrameElement* iframe = HTMLIFrameElement::create(*document);
+  HTMLIFrameElement* iframe = HTMLIFrameElement::create(*document, false);
 
   iframe->setAttribute(HTMLNames::permissionsAttr, "geolocation");
   EXPECT_EQ("geolocation", iframe->permissions()->value());
   iframe->setAttribute(HTMLNames::permissionsAttr, "geolocation notifications");
   EXPECT_EQ("geolocation notifications", iframe->permissions()->value());
 }
 
 // Test setting via the DOMTokenList (JS codepath).
 TEST(HTMLIFrameElementTest, SetPermissionsAttributeJS) {
   Document* document = Document::create();
-  HTMLIFrameElement* iframe = HTMLIFrameElement::create(*document);
+  HTMLIFrameElement* iframe = HTMLIFrameElement::create(*document, false);
 
   iframe->permissions()->setValue("midi");
   EXPECT_EQ("midi", iframe->getAttribute(HTMLNames::permissionsAttr));
 }
 
 }  // namespace blink