@marp68:
Standard Calibre will automatically make the Comments into HTML given any chance to do so, which is why you see the behavior that you do.
If you want to take it out of Calibre's hands, giving it no chance to add any HTML to your Comments after you have stripped all of the HTML out, I suggest you try the Job Spy+ plug-in. Its GUI Tool #18 (of 21) is named "Bulk Convert HTML Comments to Plain Text [Selected Books]". It does a direct database update of the Comments after stripping out all HTML. Standard Calibre has no chance to add it back, because Standard Calibre knows nothing about the update. However, if you use Edit Metadata to edit the Comments thereafter, Calibre will perform its default behavior. So, GUI Tool #18 is intended to be used when you will
never want
any HTML in the Comments for certain selected books.
I would never suggest that you install JS+
just for GUI Tool #18, but if you have JS+ already, or want or need one of its many other GUI Tools or its Job Display Tool, then #18 would be available automatically.
https://www.mobileread.com/forums/sho...d.php?t=269911
DaltonST