The border-block-start-width CSS property specifies the border width of the block start.
Syntax
CSS
border-block-start-width: value;
JS
object.style.borderBlockStartWidth = "value";
Values
<'border-block-start-width'> = <'border-top-width'>
<'border-top-width'> = <line-width>
<line-width> = <length [0,∞]> | thin | medium | thick
<length>
Specifies the length using a number followed by a unit of measurement.
thin
A thin line.
medium
A medium line.
thick
A thick line.
Initial
medium
