[Webkit-unassigned] [Bug 185029] New: <img src=mp4> does not display on ios despite Accept: video/* advertisement

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=185029

            Bug ID: 185029
           Summary: <img src=mp4> does not display on ios despite Accept:
                    video/* advertisement
           Product: WebKit
           Version: Safari 11
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Images
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: colin at bendell.ca

Safari in ios 11.3 added <img src=mp4> support and 'video/*' to the Accept header. Safari for macOS properly displays this content. However, ios returns an empty box and does not render the looping mp4.

For example:
https://codepen.io/team/Cloudinary/pen/NMRMEx

<img src="https://colinbendell.cloudinary.com/image/upload/c_crop,f_mp4,g_auto,h_350,w_400/v1512090972/Wizard-Clap-by-Markus-Magnusson.mp4">

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