This is a port specific failure and in other ports this is handled by ImageLoader::updateFromElement() setting ResourceLoaderOptions.loadedFromPluginElement. This causes these tests to fail: - http/tests/security/contentSecurityPolicy/userAgentShadowDOM/default-src-object-data-url-blocked.html - http/tests/security/contentSecurityPolicy/userAgentShadowDOM/default-src-object-data-url-blocked2.html - http/tests/security/contentSecurityPolicy/userAgentShadowDOM/default-src-object-data-url-blocked3.html I'm not sure why the win port would be doing something different.
<rdar://problem/88765166>