Alex Crichton 02b7021053 Leverage new rustc wasm features
This commit leverages two new attributes in the Rust compiler,
`#[wasm_custom_section]` and `#[wasm_import_module]`. These two attributes allow
removing a lot of hacks found in wasm-bindgen and also allows removing the
requirement of `wasm-opt` to remove the unused data sections.

This does require two new nightly features but we already required the
`proc_macro` nightly feature and these will hopefully be stabilized before that
feature!
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DOM access

This directory is an example of using the #[wasm_bindgen] macro to interact with the DOM, specifically the document object. You'll see here a few examples of defining access to the global document variable as well as appending a new HTML node to it.

You can build the example with:

$ ./build.sh

(or running the commands on Windows manually)

and then opening up index.html in a web browser should show a hello message on the web page generated by the wasm.

For more information about this example be sure to check out hello_world which also has more comments about caveats and such.