src/vs/workbench/contrib/welcomeWalkthrough/browser/walkThroughPart.ts/WalkThroughPart/pageDown
class WalkThroughPart:	pageDown() {
		const scrollDimensions = this.scrollbar.getScrollDimensions();
		const scrollPosition = this.scrollbar.getScrollPosition();
		this.scrollbar.setScrollPosition({ scrollTop: scrollPosition.scrollTop + scrollDimensions.height });
	}