Re-add 'HTML_NAMESPACE' (used in tests)

[njam]

Just making the code compile

cargo check --all-targets

The const HTML_NAMESPACE is used in the same file, in the tests module.
Not sure if you prefer defining the constant in the tests module, to avoid it being "dead code"?

[Pauan]

Oops, yeah I'd rather just change the tests to use html! instead.

[njam]

Hm, the tests are using DomBuilder, but html! is creating Dom.
I've now replaced DomBuilder::new(create_element_ns(...)) with DomBuilder::new_html(...), does that make sense?

[njam]

btw, how are you running the tests? :D

I tried running tests with "wasm-bindgen-test" in Chrome, and got 3/6 failing tests.

[Pauan]

Oh, I'm sorry, I somehow missed this issue. I don't actually run any of the tests, I just use them for compile-time type checking.