It's mentioned in the GitHub readme, SuperHTML only supports HTML5 regardless of what you put in the doctype.
I will probably keep tracking the WHATWG living spec and never implement any other spec (old HTML versions, XHTML), so if you have a keen interest in anything other than contemporary HTML, SuperHTML might not be the right tool for the job.
That said, I'll add a warning if you put something else in the doctype so that users can know what to expect.
I will probably keep tracking the WHATWG living spec and never implement any other spec (old HTML versions, XHTML), so if you have a keen interest in anything other than contemporary HTML, SuperHTML might not be the right tool for the job.
That said, I'll add a warning if you put something else in the doctype so that users can know what to expect.