An object describing widths of HTMLElement borders.
HTMLElement
bottom : number
module:utils/dom/getborderwidths~BorderWidths#bottom
left : number
module:utils/dom/getborderwidths~BorderWidths#left
right : number
module:utils/dom/getborderwidths~BorderWidths#right
top : number
module:utils/dom/getborderwidths~BorderWidths#top