Just yesterday, I took a screenshot of the title page of Dive Into HTML5 to include in a presentation as a highly recommended resource. Now it’s gone. That site, along with all the other “Dive Into…” sites and addictionis.org, is returning an HTTP “410 Gone” message.

Mark’s Github, Google+, Reddit, and Twitter accounts have all been deleted. And attempts to email him have been bounced back.

This is very reminiscent of Why the Lucky Stiff’s infosuicide, and it’s honestly shocking.