I'd say so since 8.156 in the 17th edition explicitly mentions websites: "The following guide­lines apply primarily to titles as they are mentioned or cited in

I'd say so since 8.156 in the 17th edition explicitly mentions websites: "The following guide­lines apply primarily to titles as they are mentioned or cited in text or notes. They apply to titles of books, journals, newspapers, and websites . . ." And 8.191 elaborates further: " Titles of websites mentioned or cited in text or notes are normally set in roman, headline-style . . ." Basically, there are some differences regarding italics/quotation marks but headline style seems to apply to all kinds of titles of digital resources.