Why are you expect Apple to announce web-related stuff at WWDC? Besides the fact that the web isn't really what WWDC attendees care about, WebKit is also open source and you can watch development happening. Yes, sometimes Apple does work on a big thing that doesn't actually land on the open source project until they announce it, but that's usually when it's being done to support some other hardware or OS feature that they haven't announced yet.

If you want to see what's going on in WebKit, just check out https://webkit.org. A simple way to follow along is to read the "What's New In Safari Technology Preview ##" blog posts (and install the Safari Technology Preview to actually try this stuff out).

Because they used to announce web-related things at WWDC. e.g. https://developer.apple.com/videos/play/wwdc2013/601/

Yeah, and last year they had a session called Extending your App with Safari App Extensions (https://developer.apple.com/videos/play/wwdc2016/214/), as well as Apple Pay on the Web (https://developer.apple.com/videos/play/wwdc2016/703/). So they still do have the occasional web-related session. But for the most part there's not much need to be talking about web stuff at WWDC, because most development of the web stuff happens in the open already throughout the entire year, and WWDC isn't being attended by web developers anyway, it's being attended by app developers.

I remember when they announced multipath TCP during WWDC. It sounds like you are saying that WWDC is only for app developers and they just don't have a conference for web developers. I thought they cared about the web, they used to.

There's a bazillion difference conferences for web developers. Why do you want WWDC to be one too?