The border-bottom-width property for CSS sets the width of the bottom border of a box.
border-bottom-width: value;
object.style.borderBottomWidth = "value";
<'border-bottom-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.
border
border-bottom
border-bottom-color
border-bottom-style
border-color
border-left
border-left-color
border-left-style
border-left-width
border-right
border-right-color
border-right-style
border-right-width
border-style
border-top
border-top-color
border-top-style
border-top-width
border-width
accent-color
align-content
align-items
align-self
all
animation
animation-composition
animation-delay
animation-direction
animation-duration
animation-fill-mode
animation-iteration-count
animation-name
animation-play-state
animation-timeline
animation-timing-function
appearance
aspect-ratio
backdrop-filter
backface-visibility
background
background-attachment
background-blend-mode
background-clip
background-color
background-image
background-origin
background-position
background-position-x
background-position-y
background-repeat
background-size
block-ellipsis
block-size
border-block
border-block-color
border-block-end
border-block-end-color
border-block-end-style
border-block-end-width
border-block-start
border-block-start-color
border-block-start-style
border-block-start-width
border-block-style
border-block-width
border-bottom-left-radius
border-bottom-right-radius
border-collapse
border-end-end-radius
border-end-start-radius
border-image
border-image-outset
border-image-repeat
border-image-slice
border-image-source
border-image-width
border-inline
border-inline-color
border-inline-end
border-inline-end-color
border-inline-end-style
border-inline-end-width
border-inline-start
border-inline-start-color
border-inline-start-style
border-inline-start-width
border-inline-style
border-inline-width
border-radius
border-spacing
border-start-end-radius
border-start-start-radius
border-top-left-radius
border-top-right-radius
bottom
box-decoration-break
box-shadow
box-sizing
caption-side
caret
caret-color
caret-shape
clear
clip
clip-path
color
color-scheme
column-count
column-fill
column-gap
column-rule
column-rule-color
column-rule-style
column-rule-width
column-span
column-width
columns
contain
contain-intrinsic-block-size
contain-intrinsic-height
contain-intrinsic-inline-size
contain-intrinsic-size
contain-intrinsic-width
container
container-name
container-type
content
content-visibility
continue
counter-increment
counter-reset
counter-set
cursor
direction
display
empty-cells
filter
flex
flex-basis
flex-direction
flex-flow
flex-grow
flex-shrink
flex-wrap
float
font
font-family
font-feature-settings
font-kerning
font-optical-sizing
font-size
font-size-adjust
font-stretch
font-style
font-variant
font-variant-caps
font-variant-ligatures
font-variant-numeric
font-variant-position
font-variation-settings
font-weight
forced-color-adjust
gap
grid
grid-area
grid-auto-columns
grid-auto-flow
grid-auto-rows
grid-column
grid-column-end
grid-column-start
grid-row
grid-row-end
grid-row-start
grid-template
grid-template-areas
grid-template-columns
grid-template-rows
hanging-punctuation
height
hyphens
image-rendering
initial-letter
initial-letter-align
inline-size
inset
inset-block
inset-block-end
inset-block-start
inset-inline
inset-inline-end
inset-inline-start
isolation
justify-content
justify-items
justify-self
left
letter-spacing
line-break
line-clamp
line-height
list-style
list-style-image
list-style-position
list-style-type
margin
margin-block
margin-block-end
margin-block-start
margin-bottom
margin-inline
margin-inline-end
margin-inline-start
margin-left
margin-right
margin-top
mask
mask-border
mask-border-mode
mask-border-outset
mask-border-repeat
mask-border-slice
mask-border-source
mask-border-width
mask-clip
mask-composite
mask-image
mask-mode
mask-origin
mask-position
mask-repeat
mask-size
mask-type
math-depth
math-shift
math-style
max-block-size
max-height
max-inline-size
max-lines
max-width
min-block-size
min-height
min-inline-size
min-width
mix-blend-mode
nav-down
nav-left
nav-right
nav-up
object-fit
object-position
opacity
orphans
outline
outline-color
outline-offset
outline-style
outline-width
overflow
overflow-block
overflow-clip-margin
overflow-inline
overflow-wrap
overflow-x
overflow-y
padding
padding-block
padding-block-end
padding-block-start
padding-bottom
padding-inline
padding-inline-end
padding-inline-start
padding-left
padding-right
padding-top
paint-order
perspective
perspective-origin
place-content
place-items
place-self
pointer-events
position
print-color-adjust
quotes
resize
right
rotate
row-gap
scale
scroll-behavior
scroll-margin
scroll-margin-block
scroll-margin-block-end
scroll-margin-block-start
scroll-margin-bottom
scroll-margin-inline
scroll-margin-inline-end
scroll-margin-inline-start
scroll-margin-left
scroll-margin-right
scroll-margin-top
scroll-padding
scroll-padding-block
scroll-padding-block-end
scroll-padding-block-start
scroll-padding-bottom
scroll-padding-inline
scroll-padding-inline-end
scroll-padding-inline-start
scroll-padding-left
scroll-padding-right
scroll-padding-top
scroll-snap-align
scroll-snap-stop
scroll-snap-type
scroll-timeline
scroll-timeline-axis
scroll-timeline-name
scrollbar-color
scrollbar-gutter
scrollbar-width
shape-image-threshold
shape-margin
shape-outside
tab-size
table-layout
text-align
text-align-all
text-align-last
text-combine-upright
text-decoration
text-decoration-color
text-decoration-line
text-decoration-skip-ink
text-decoration-style
text-decoration-thickness
text-decoration-trim
text-emphasis
text-emphasis-color
text-emphasis-position
text-emphasis-style
text-indent
text-justify
text-orientation
text-overflow
text-shadow
text-transform
text-underline-offset
text-underline-position
top
transform
transform-box
transform-origin
transform-style
transition
transition-delay
transition-duration
transition-property
transition-timing-function
translate
unicode-bidi
vertical-align
visibility
white-space
widows
width
word-break
word-spacing
word-wrap
writing-mode
z-index
zoom
World Wide Web Consortium (W3C)