I just noticed that the html5 tag has a new icon:
I searched on Stack Overflow and Google for her. Apparantly, she once showed up in an advert. Other than that, I know nothing about her. Who is Doris, and what's she doing on the HTML5 tag?
@Bart covers the 'who' part of your question above, and @balpha addressed the why.
Also noted by @balpha, the error is now fixed. :)