Some attributes should accept boolean values

[ratorx]

Some attributes are incorrectly marked as taking a string, whereas they should take boolean values.

As a concrete example, HtmlScriptTag.defer should take a boolean argument, rather than a string argument.

[bebraw]

Can you compile a list? Is there a definitive source for these? Would it be possible to consume the correct types from some another type definition for the DOM?

[ratorx]

Typescript has a list of generated DOM types as well as the source code for the generator available.

This seems like a good source of definitive APIs for this project. Perhaps a wrapper to the generator could be used to generate the specific type definitions needed by this project?