gifs or webp with missing url scheme cause error when checking if they are animated

[pattonwebz]

Please give us a description of what happened.

A scan running against a gif or webp image to check if it is animated fails, it is not able to open the file because of a missing protocol. This blocks the saving of content and throws visible errors to the user.

Please describe what you expected to happen and why.

Plugin handles the missing scheme and does not show error.

How can we reproduce this behavior?

1. Add <img src="//assets.rewardstyle.com/images/search/350.gif"> to a post
2. Save the post
3. See error notice and fail to save message.

Technical info

• WordPress version:
• Accessibility Checker version: 1.10.0
• If relevant, which editor is affected (or editors):
• [ ] Classic Editor
• [x] Gutenberg
• [x] Classic Editor plugin
• [ ] Page Builder (please specify):

• Which browser is affected (or browsers):

• [ ] Internet Explorer

• [ ] Edge

• [ ] Chrome

• [ ] Firefox

• [ ] Safari

• [ ] Brave

• Relevant plugins in case of a bug:

• Tested with theme: