Avoid reflow at accessing the window object

[ghost]

Accessing all keys in the window object leads to an reflow at line 41 in index.js. A fast and dirty workaround of me would be to avoid all attributes with with or height in it.

if(k.toLowerCase().indexOf('width') > -1 || k.toLowerCase.indexOf('height') > -1) continue;

As I don't understand the reason for the function completely I'm not really able to propose a correct pull request. That's why I just raised an issue. I hope that's okay.

[ljharb]

The purpose of the line is to locate browser bugs - the purpose of the blacklisted keys is to avoid accessing any problematic window keys. I wasn't aware that simply accessing width and/or height caused a reflow :-/ the proper solution will be to add them to the exclusion list.

[ljharb]

Thanks! Released in v1.0.10.