Its not possible to make part of H1 non-bold

This looks like a flaw of logic to me. <Hn> elements aren't bold, but titles. As you mentioned, even the browser native execCommand, used on built-in editor, doesn't know what to do.

@fedulovivan, do you have a suggestion of a possible HTML markup for the situation?

Hi, @robsonsobral An html, generated by built-in RTE is correct: Original: <h1>Insert title here</h1> After making word "title" non-bold: <h1>Insert <span style="font-weight: normal">title</span> here</h1>

The problem is it's not rendered properly on the canvas. The whole text remains bold.

I dig a little into this. After the blur event, the markup changes from <span style="font-weight: normal">title</span> to <span data-gjs-type="default"><span data-gjs-type="text">title </span></span>. If I try again, it becomes <span data-gjs-type="default"><span data-gjs-type="default"><span data-gjs-type="text">title </span></span></span>.

It's hard to have a simple, but functional built-in editor other than markdown.

I couldn't reproduce the error on the newsletter demo. It worked fine.