Visit <https://trac.webkit.org/export/218025/webkit/trunk/LayoutTests/http/tests/security/contentSecurityPolicy/allow-favicon.html> and you will see the following error message: [[ This page contains the following errors: error on line 18 at column 8: Opening and ending tag mismatch: link line 0 and head Below is a rendering of the page up to the first error. ]] This error occurs because Trac is returned an HTTP response with Content-Type: application/xhtml+xml; charset=utf-8. So, Safari parses the response as XML. But the markup is HTML, which is more lenient that XML; => Safari errors out. For completeness, I got this export URL by visiting <https://trac.webkit.org/browser/trunk/LayoutTests/http/tests/security/contentSecurityPolicy/allow-favicon.html> and clicking the hyperlink "Original Format" at the bottom of the page. Trac.webkit.org returns the correct Content-Type for plain text files. You can see this by clicking "Original Format" at the bottom of <https://trac.webkit.org/browser/webkit/trunk/Source/WebCore/LICENSE-APPLE>
Created attachment 312505 [details] [Screenshot] Parse error
To be clear, Trac should return an HTML content-type for <https://trac.webkit.org/export/218025/webkit/trunk/LayoutTests/http/tests/security/contentSecurityPolicy/allow-favicon.html>.
I think that for this to work, we may need to set content type in svn. Some tests actually work, an my assumption that I didn't don't yet attempt to verify is that it's the ones that have svn properties on them.
I added a MIME type in r218317, and now this file doesn't have the problem any more indeed: https://trac.webkit.org/export/218317/webkit/trunk/LayoutTests/http/tests/security/contentSecurityPolicy/allow-favicon.html