I’m afraid this was resolved a little bit too enthusiastic.
I just found two issues regarding this:
1. When specifying width and height attributes for <img> only numbers should be used, i.e. don’t add “px”.
2. The custom services now contain the width and height attributes for the img twice.
Both issues cause the plugin output to be non-HTML5 compliant.
I fixed this in my instance; could you please fix it in the plugin?
Regards.