multiple issues when context isn't window

[jedwards1211]

• scroll jumps to 0 then animates to end position (this is because window.pageYOffset is used even when context !== window
• scroll end position is often incorrect, e.g. when context.scrollTop !== 0
• smooth scrolling to the end doesn't ease out in some cases. Solution: clamp the end position to context.scrollHeight - context.offsetHeight

These issues are fixed in my PR #20

[powerbuoy]

I'd also like to see this fixed. As well as support for horizontal scrolling.

[dennismphil]

Tried 0.2.2 with webpack and noticed an error. My guess is, this issue is also related to not setting the context correctly in the library

Error:

/js/smoothscroll.js:27
ent.querySelectorAll === void 0 || window.pageYOffset === void 0 || history.pu
                                                                    ^
ReferenceError: history is not defined

[aabbi]

facing the same issue as @dennismphil