borderWidth:
a style sheet property ( STYLE tag), or a style property inside a tag (STYLE attribute). Sets the width of all border lines for the object.
Border-Width: thin medium thick 1px 1mm 1cm 1in 1pt 1pc

border-width: thin

border-width: medium

border-width: thick

border-width: 2mm

border-width: 1mm 2mm

border-width: 1mm 2mm 3mm

border-width: 1mm 2mm 3mm 4mm