Comment by JoshTriplett

It says that the browser must download "an HTML document that still contains the following text". I can see how either interpretation could work, but I would interpret "contains" as "the text is in the HTML document", not "rendering the HTML document in a JavaScript-capable browser displays the text".

(Though, that said, some approaches to rendering sites via JavaScript would still have that text in the initially downloaded HTML file as JavaScript data.)

As for the "or", I read it as "doing either X or Y must", not "either X must or Y must (not necessarily both)", but yeah, I can see either interpretation being valid.