Re: [dom-tests][html-tests][xhr-tests] Start centralizing IDLs to reduce duplication and errors (#5666)

# [Codecov](https://codecov.io/gh/w3c/web-platform-tests/pull/5666?src=pr&el=h1) Report
> :exclamation: No coverage uploaded for pull request base (`master@0085e16`). [Click here to learn what that means](https://docs.codecov.io/docs/error-reference#section-missing-base-commit).
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/w3c/web-platform-tests/pull/5666/graphs/tree.svg?width=650&height=150&src=pr&token=DI3aecdnSC)](https://codecov.io/gh/w3c/web-platform-tests/pull/5666?src=pr&el=tree)

```diff
@@            Coverage Diff            @@
##             master    #5666   +/-   ##
=========================================
  Coverage          ?   87.22%           
=========================================
  Files             ?       24           
  Lines             ?     2418           
  Branches          ?      406           
=========================================
  Hits              ?     2109           
  Misses            ?      239           
  Partials          ?       70
```



------

[Continue to review full report at Codecov](https://codecov.io/gh/w3c/web-platform-tests/pull/5666?src=pr&el=continue).
> **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta)
> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/w3c/web-platform-tests/pull/5666?src=pr&el=footer). Last update [0085e16...c4ef016](https://codecov.io/gh/w3c/web-platform-tests/pull/5666?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).


View on GitHub: https://github.com/w3c/web-platform-tests/pull/5666#issuecomment-296718192

Received on Monday, 24 April 2017 15:58:24 UTC