The DOM itself is very slow, much slower than Javascript, so you're not going to be seeing any great performance increase if WASM can access the DOM directly.

The DOM itself is very slow, much slower than Javascript, so you're not going to be seeing any great performance increase if WASM can access the DOM directly. I also have to wonder if people are excited about replacing Javascript, why they would want to have HTML/CSS/DOM on top of WASM. A different front-end UI tech could be much better than slow, old DOM.