Element.getAttribute's name parameter should not be optional

[Arnavion]

The IDL XML seems to think the parameter is optional with default of null, but it isn't according to the spec. Indeed browsers complain if calling it without any parameters.

[mhegazy]

i think this is a internal implementation detail. We get this file from the IE/Edge folks, and i know their implementation relies on these value.
I believe this reads as, an optional parameter, and if not specified, it is treated as null for the implementation of the function.
so for the caller, it is just optional.

[mhegazy]

Indeed browsers complain if calling it without any parameters.

which browser is that? and what version? again it is possible that this is an inconsistency in IE/Edge.

[Arnavion]

Sorry, I should've clarified. I tested in FF Nightly (48) and Chrome Dev (51). IE 11 returns null, as you said. Didn't try Edge.

[mhegazy]

so it is a bug in the spec files we get from IE. Adding an entry to https://github.com/Microsoft/TSJS-lib-generator/blob/master/inputfiles/overridingTypes.json should solve the issue.

[mhegazy]

Thanks @YuichiNukiyama