Progress Bar III - (Scrolled Percentage)

Element.scrollTop property gets or sets the number of pixels that an elements content is scrolled vertically.

Element.scrollHeight read-only property is a measurement of the height of an elements content, including content not visible on the screen due to overflow.

Element.clientHeight read-only property is zero for elements with no CSS or inline layout boxes; otherwise, its the inner height of an element in pixels. It includes padding but excludes borders, margins, and horizontal scrollbars (if present).

HTMLElement.offsetHeight read-only property returns the height of an element, including vertical padding and borders, as an integer.

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