The question title said it all.
After serializing the ‘prosemirror-tables’'s table , no colgroup tag in the generated editor content’s string.
Only TH have the data-colwidth attribute to wich is affected the column’s width but css doesn’t consider it and columns always stretch to maximum width.
I ll try override the TH’s toDom (or the function which is used in the serialization) to try fix this. If i can add the style.width besides the data-colwidth attribute , it will work