It does not make sense to allow unsupported mime types for canvas.toDataURL(). If the system allows encoding to them, we are going to return DataURL that we do not allow loading.
<rdar://problem/55512630>
Created attachment 387664 [details] Patch
Comment on attachment 387664 [details] Patch Clearing flags on attachment: 387664 Committed r254541: <https://trac.webkit.org/changeset/254541>
All reviewed patches have been landed. Closing bug.