[whatwg/dom] Make all parameters to initEvent() / initCustomEvent() optional excep… (#417)

…t the first

Make all parameters to initEvent() / initCustomEvent() optional except the first.
This aligns the specification with WebKit and gets it closer to Blink.

This closes issue #387.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/417

-- Commit Summary --

  * Make all parameters to initEvent() / initCustomEvent() optional except the first

-- File Changes --

    M dom.bs (4)

-- Patch Links --

https://github.com/whatwg/dom/pull/417.patch
https://github.com/whatwg/dom/pull/417.diff

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