some new ie8 Compatibility

[dotsoy]

ie8 is not support indexOf and compareDocumentPosition function

[ljharb]

@alwaysYoungCohen for Array#indexOf, you should be using https://github.com/es-shims/es5-shim

[WebReflection]

Yes, this poly won't add ES5 or ES6 features so use @ljharb polyfill for that.

I'll keep this open to see how difficult this spec could be to be implemented in here:
https://www.w3.org/TR/DOM-Level-3-Core/core.html#Node3-compareDocumentPosition

[dotsoy]

thanks@ljharb@WebReflection