scrollLeft() does not always return an Integer

[jd-dean]

Documentation issue: scrollLeft can return a Double in Chrome (tested in Chrome 96) and Edge.

Repro by changing the zoom level and scrolling horizontally.
https://jsfiddle.net/d6u2sjth/4/

MDN says: "Warning: On systems using display scaling, scrollLeft may give you a decimal value"
https://developer.mozilla.org/en-US/docs/Web/API/Element/scrollLeft

See also: #608