offsetWidth is a DOM property that returns the visible width of an element, including the element's border, padding, and vertical scroll bar (if present). In other words, offsetWidth calculates the entire width of the element, including the width of the border, padding, and vertical scrollbar.
Specifically, the value of offsetWidth is equal to the width of the element's content area plus the width of the left and right borders and vertical scroll bars. This value is in pixels (px).
Please note that offsetWidth is a read-only property and cannot be modified.
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