Hi, I would like to suggest we remove support for 'multipart/x-mixed-replace’ main resources while keeping support for multipart images.
Based on Chrome usage data, this feature is extremely rarely used by Web sites (less than 0.00001% of page loads) . This feature adds complexity to the loader and is a source of (security) bugs (e.g.  recently), current support also seems buggy. Current support in Safari / WebKit: - Support is not great is WebKit. If you load a Motion JPEG main resource for example, it will keep creating a new ImageDocument and all its DOM tree for every frame (tested on Safari / Mac). - It looks like support is broken on Safari on iOS (I tried a Motion JPEG main resource on iOS8, I see the first frame then a blank page that never finishes loading). Other browsers: - Never supported by IE (including IE11) for any resource - Chrome already dropped support for this (main resources only) almost 2 years ago . - Firefox 37 still supports this based on local testing. Again, I am only proposing dropping support for main resources. For e.g., having an <IMG> element in a page whose src attribute points to a Motion JPEG would still work as intended.  https://code.google.com/p/chromium/issues/detail?id=249132 <https://code.google.com/p/chromium/issues/detail?id=249132>  https://bugs.webkit.org/show_bug.cgi?id=143979 <https://bugs.webkit.org/show_bug.cgi?id=143979>  http://src.chromium.org/viewvc/blink?view=revision&revision=152363 <http://src.chromium.org/viewvc/blink?view=revision&revision=152363> Kr, -- Chris Dumez - Apple Inc. - Cupertino, CA
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