WebP images doesn't work in Application Guard mode

Issue #19618851 • Assigned to wptrentri


Daniel A.
Nov 14, 2018
This issue is public.
Found in
  • Microsoft Edge
Found in build #
Reported by 2 people

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Steps to reproduce

Steps to reproduce:

  1. Open Microsoft Edge in Application Guard mode.
  2. Open any website with a WebP image or open any WebP image directly.

The WebP image should render. This works in Microsoft Edge when not loaded in Application Guard Mode.

The image is displayed as a broken graphics icon.

Important note:
When there are multiple <picture><source/>s then Edge still prefers to download an WebP image even though it will fail to render it, and there are other file formats available.

Example affected website:


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    Comments and activity

    • Microsoft Edge Team

      Changed Assigned To to “wptcomptri”

      Changed Assigned To to “wptrentri”

    • Is there any update on this? Just curious to see what the timeline is for a fix. Since Firefox now supports WEBP as well, I would like to adopt the format on my web projects, but I am of course concerned about this issue being a showstopper.

      If a fix isn’t available in the short term, is there a known work around to ensure using WEBP in the element doesn’t result in a broken image?

    • Please fix this! So many images now not showing on many sites.

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