Yes, actually. We'd encourage the HTML working group to do original work. Many W3C working groups do that, e.g. the webapps working group worked on web components and various other specs, and it helps the web platform.
So they should reinvent the wheel when there are good solutions out there?
Isn't the whole point of standards to stop that sort of thing happening?
I get that you may feel that someone is just appropriating your work rather than doing their own but if your aim is to build a standard then reusing things is probably going to be part of doing that.
The specs were written from scratch, because the W3C holds the copyright on them (the old specs are also of relatively little use). The spec now called HTML5 was officially called Web Applications 1.0 till after the W3C HTML WG was (re-)chartered.
Isn't the whole point of standards to stop that sort of thing happening?
I get that you may feel that someone is just appropriating your work rather than doing their own but if your aim is to build a standard then reusing things is probably going to be part of doing that.