There are some tools but most of them tend to be of the "edit visually, export to HTML" variety which, TBH, makes a bit more sense since pure HTML doesn't have

There are some tools but most of them tend to be of the "edit visually, export to HTML" variety which, TBH, makes a bit more sense since pure HTML doesn't have enough information for keeping track of repeated elements and the structure of an entire site. Even tools back in the day when WYSIWYG was way more popular that worked with HTML directly tended to use custom tags and attributes for additional metadata.