Nothing loads in the web browser viewing the solution for one of the sections it included a </DOCTYPE HTML!> at the bottom of the code?? The only thing that works is to replace with solution but the differences so far include closing doctype tag(?) and a empty new line at the bottom of the code.
The irony a section on accessibility and nothing loads is this supposed to be intentional? I’ve not come upon this error before and yes I’ve tried the usual things refreshing browser etc same error every time. I’ve reported a bug.