Acceptance Criteria

• The listed features are documented sufficiently on MDN
• BCD is updated
• Interactive example and data repos are updated if appropriate
• The content has been reviewed as needed

For folks helping with Firefox related documentation

• Set bugs to dev-doc-complete
• Add entry to Firefox release notes if feature is enabled in release
  or
• Add entry to Firefox experimental features page if feature is not yet enabled in release

Features to document

I'm not entirely sure what is required here, but at a first pass adding WebP as a supported image type in HTMLCanvasElement.toDataURL is at least one place

Related Gecko bugs

https://bugzilla.mozilla.org/show_bug.cgi?id=1511670