src/vs/base/browser/ui/scrollbar/scrollableElement.ts/DomScrollableElement/scanDomNode
class DomScrollableElement:	public scanDomNode(): void {
		// width, scrollLeft, scrollWidth, height, scrollTop, scrollHeight
		this.setScrollDimensions({
			width: this._element.clientWidth,
			scrollWidth: this._element.scrollWidth,
			height: this._element.clientHeight,
			scrollHeight: this._element.scrollHeight
		});
		this.setScrollPosition({
			scrollLeft: this._element.scrollLeft,
			scrollTop: this._element.scrollTop,
		});
	}