1. Canvas (basic support)

    Method of generating fast, dynamic graphics using JavaScript.

  2. htmlcanvaselement api: todataurl

  3. htmlcanvaselement api: todataurl: `type` parameter supports `"image/jpeg"`

  4. htmlcanvaselement api: todataurl: `type` parameter supports `"image/png"`

  5. htmlcanvaselement api: todataurl: `type` parameter supports `"image/webp"`