[KevinH]

Well then implement it yourself and generate a PR and if it looks good we may merge it in the future.

Sigil does not strip hidden html only illegal code just like browsers do.

The idea of adding placeholder text then using search and replace can be done now with no changes. Class attributes can have multiple values. So if you have a list of words you want to be italicized you could use Python Function Replace to add that class right now.

And fwiw our New feature Suggestion thread is closed now. Once I reopen the new feature suggestion thread feel free to add your suggestion there so everyone sees it and can comment and it does not get lost.