Re: [heycam/webidl] Get specs updated to new dictionary defaulting setup (#758)

@anssiko a part of https://github.com/mdittmer/web-apis was indeed directed towards this problem, and @mdittmer did in fact produce lists of discrepancies in various categories. We used these lists to file a lot of bugs tracked by https://crbug.com/674593. You can see a lot have been resolved, so the approach worked!

However, we didn't keep triaging differences over time or build tooling to prevent differences from occurring in the first place.

The biggest hurdle, which isn't a very big one, is having a Web IDL parser able to parse both all spec IDL (webidl2.js) but also all the IDL from Chromium, Gecko and WebKit. https://github.com/mdittmer/webidl2-js (not the same as webidl2.js) was once able to do that, but such a parser has to be continuously maintained to keep up with changes.

So to summarize, such tooling isn't deployed, but it's been done before, and the technical challenges are pretty modest. It's mostly a matter of time investment vs. payoff, and web-platform-tests took priority for us.

@lukebjerring FYI about this history and potential area of work.

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