[whatwg] [CORS] WebKit tainting image instead of throwing error

Ian Hickson ian at hixie.ch
Tue Oct 4 12:12:35 PDT 2011

On Tue, 4 Oct 2011, Kenneth Russell wrote:
> As far as I can tell the tainting behavior WebKit implements is correct, 
> and is specified by the text in 
> http://www.whatwg.org/specs/web-apps/current-work/multipage/embedded-content-1.html#the-img-element 
> . Scroll down to step 6 in the algorithm for "When the user agent is to 
> update the image data...". Note that the "default origin behaviour" is 
> set to "taint" when fetching images.

If you do a CORS-enabled fetch, you never get that far. If the CORS check 
fails, the browser is required to act as if a network error occurred.


Ian Hickson               U+1047E                )\._.,--....,'``.    fL
http://ln.hixie.ch/       U+263A                /,   _.. \   _\  ;`._ ,.
Things that are impossible just take longer.   `._.-(,_..'--(,_..'`-.;.'

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