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border-top CSS property

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

The border-top shorthand CSS property sets all the properties of an element's top border.

In this article

Try it

border-top: solid;
border-top: dashed red;
border-top: 1rem solid;
border-top: thick double #32a1ce;
border-top: 4mm ridge rgb(211 220 50 / 0.6);
<section class="default-example" id="default-example"> <div class="transition-all" id="example-element"> This is a box with a border around it. </div> </section>
#example-element { background-color: #eeeeee; color: darkmagenta; padding: 0.75em; width: 80%; height: 100px; }

Constituent properties

This property is a shorthand for the following CSS properties:

Syntax

css
border-top: 1px; border-top: 2px dotted; border-top: medium dashed green; /* Global values */ border-top: inherit; border-top: initial; border-top: revert; border-top: revert-layer; border-top: unset;

The three values of the shorthand property can be specified in any order, and one or two of them may be omitted.

Values

<br-width>

See border-top-width.

<br-style>

See border-top-style.

<color>

See border-top-color.

Description

As with all shorthand properties, border-top always sets the values of all of the properties that it can set, even if they are not specified. It sets those that are not specified to their default values. Consider the following code:

css
border-top-style: dotted; border-top: thick green;

It is actually the same as this one:

css
border-top-style: dotted; border-top: none thick green;

The value of border-top-style given before border-top is ignored. Since the default value of border-top-style is none, not specifying the border-style part results in no border.

Formal definition

Initial valueApplies toInheritedComputed valueAnimation type
as each of the properties of the shorthand:
all elements. It also applies to ::first-letter.
no
as each of the properties of the shorthand:
as each of the properties of the shorthand:

Formal syntax

border-top =
<line-width> ||
<line-style> ||
<color>

<line-width> =
<length [0,∞]> |
hairline |
thin |
medium |
thick

<line-style> =
none |
hidden |
dotted |
dashed |
solid |
double |
groove |
ridge |
inset |
outset
This syntax reflects the latest standard as per CSS Borders and Box Decorations Module Level 4. Not all browsers may have implemented every part. See Browser compatibility for support information.

Examples

Applying a top border

HTML

html
<div>This box has a border on the top side.</div>

CSS

css
div { border-top: 4px dashed blue; background-color: gold; height: 100px; width: 100px; font-weight: bold; text-align: center; }

Results

Specifications

Specification
CSS Backgrounds and Borders Module Level 3
# border-shorthands

Browser compatibility

Enable JavaScript to view this browser compatibility table.

See also

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      19. text-emphasis-position
      20. text-emphasis-style
      21. text-indent
      22. text-justify
      23. text-orientation
      24. text-overflow
      25. text-rendering
      26. text-shadow
      27. text-size-adjust
      28. text-spacing-trim
      29. text-transform
      30. text-underline-offset
      31. text-underline-position
      32. text-wrap
      33. text-wrap-mode
      34. text-wrap-style
    150. timeline-scope
    151. top
    152. touch-action
    153. transform-*
      1. transform-box
      2. transform-origin
      3. transform-style
    154. transform
    155. transition-*
      1. transition-behavior
      2. transition-delay
      3. transition-duration
      4. transition-property
      5. transition-timing-function
    156. transition
    157. translate
    158. unicode-bidi
    159. user-modify
    160. user-select
    161. vector-effect
    162. vertical-align
    163. view-*
      1. view-timeline
      2. view-timeline-axis
      3. view-timeline-inset
      4. view-timeline-name
      5. view-transition-class
      6. view-transition-name
      7. view-transition-scope
    164. visibility
    165. white-space
    166. white-space-collapse
    167. widows
    168. width
    169. will-change
    170. word-break
    171. word-spacing
    172. writing-mode
    173. x
    174. y
    175. z-index
    176. zoom
  52. Selectors
    1. & nesting selector
    2. Attribute selectors
    3. Class selectors
    4. ID selectors
    5. Keyframe selectors
    6. Namespace separator
    7. Selector list
    8. Type selectors
    9. Universal selectors
  53. Combinators
    1. Child combinator
    2. Column combinator
    3. Descendant combinator
    4. Next-sibling combinator
    5. Subsequent-sibling combinator
  54. Pseudo-classes
    1. :-moz-*
      1. :-moz-broken
      2. :-moz-drag-over
      3. :-moz-first-node
      4. :-moz-handler-blocked
      5. :-moz-handler-crashed
      6. :-moz-handler-disabled
      7. :-moz-last-node
      8. :-moz-loading
      9. :-moz-locale-dir(ltr)
      10. :-moz-locale-dir(rtl)
      11. :-moz-only-whitespace
      12. :-moz-submit-invalid
      13. :-moz-suppressed
      14. :-moz-user-disabled
      15. :-moz-window-inactive
    2. :active-view-transition
    3. :active-view-transition-type()
    4. :active
    5. :any-link
    6. :autofill
    7. :blank
    8. :buffering
    9. :checked
    10. :current
    11. :default
    12. :defined
    13. :dir()
    14. :disabled
    15. :empty
    16. :enabled
    17. :first-child
    18. :first-of-type
    19. :first
    20. :focus-visible
    21. :focus-within
    22. :focus
    23. :fullscreen
    24. :future
    25. :has-slotted
    26. :has()
    27. :heading
    28. :heading()
    29. :host-context()
    30. :host
    31. :host()
    32. :hover
    33. :in-range
    34. :indeterminate
    35. :interest-source
    36. :interest-target
    37. :invalid
    38. :is()
    39. :lang()
    40. :last-child
    41. :last-of-type
    42. :left
    43. :link
    44. :local-link
    45. :modal
    46. :muted
    47. :not()
    48. :nth-*
      1. :nth-child()
      2. :nth-last-child()
      3. :nth-last-of-type()
      4. :nth-of-type()
    49. :only-child
    50. :only-of-type
    51. :open
    52. :optional
    53. :out-of-range
    54. :past
    55. :paused
    56. :picture-in-picture
    57. :placeholder-shown
    58. :playing
    59. :popover-open
    60. :read-only
    61. :read-write
    62. :required
    63. :right
    64. :root
    65. :scope
    66. :seeking
    67. :stalled
    68. :state()
    69. :target-*
      1. :target-after
      2. :target-before
      3. :target-current
    70. :target
    71. :user-invalid
    72. :user-valid
    73. :valid
    74. :visited
    75. :volume-locked
    76. :where()
    77. :xr-overlay
  55. Pseudo-elements
    1. ::-moz-*
      1. ::-moz-color-swatch
      2. ::-moz-focus-inner
      3. ::-moz-list-bullet
      4. ::-moz-list-number
      5. ::-moz-meter-bar
      6. ::-moz-progress-bar
      7. ::-moz-range-progress
      8. ::-moz-range-thumb
      9. ::-moz-range-track
    2. ::-webkit-*
      1. ::-webkit-inner-spin-button
      2. ::-webkit-meter-bar
      3. ::-webkit-meter-even-less-good-value
      4. ::-webkit-meter-inner-element
      5. ::-webkit-meter-optimum-value
      6. ::-webkit-meter-suboptimum-value
      7. ::-webkit-progress-bar
      8. ::-webkit-progress-inner-element
      9. ::-webkit-progress-value
      10. ::-webkit-scrollbar
      11. ::-webkit-search-cancel-button
      12. ::-webkit-search-results-button
      13. ::-webkit-slider-runnable-track
      14. ::-webkit-slider-thumb
    3. ::after
    4. ::backdrop
    5. ::before
    6. ::checkmark
    7. ::column
    8. ::cue
    9. ::details-content
    10. ::file-selector-button
    11. ::first-letter
    12. ::first-line
    13. ::grammar-error
    14. ::highlight()
    15. ::marker
    16. ::part()
    17. ::picker-icon
    18. ::picker()
    19. ::placeholder
    20. ::scroll-*
      1. ::scroll-button()
      2. ::scroll-marker
      3. ::scroll-marker-group
    21. ::search-text
    22. ::selection
    23. ::slotted()
    24. ::spelling-error
    25. ::target-text
    26. ::view-*
      1. ::view-transition
      2. ::view-transition-group()
      3. ::view-transition-image-pair()
      4. ::view-transition-new()
      5. ::view-transition-old()
  56. At-rules
    1. @charset
    2. @color-profile
    3. @container
    4. @counter-style
    5. @custom-media
    6. @document
    7. @font-face
    8. @font-feature-values
    9. @font-palette-values
    10. @function
    11. @import
    12. @keyframes
    13. @layer
    14. @media
    15. @namespace
    16. @page
    17. @position-try
    18. @property
    19. @scope
    20. @starting-style
    21. @supports
    22. @view-transition
  57. Values
    1. !important
    2. fit-content
    3. inherit
    4. initial
    5. max-content
    6. min-content
    7. revert
    8. revert-layer
    9. revert-rule
    10. unset
  58. Types
    1. <absolute-size>
    2. <alpha-value>
    3. <angle-percentage>
    4. <angle>
    5. <axis>
    6. <baseline-position>
    7. <basic-shape>
    8. <blend-mode>
    9. <box-edge>
    10. <calc-keyword>
    11. <calc-sum>
    12. <color-interpolation-method>
    13. <color>
    14. <content-distribution>
    15. <content-position>
    16. <corner-shape-value>
    17. <custom-ident>
    18. <dashed-function>
    19. <dashed-ident>
    20. <dimension>
    21. <display-box>
    22. <display-inside>
    23. <display-internal>
    24. <display-legacy>
    25. <display-listitem>
    26. <display-outside>
    27. <easing-function>
    28. <filter-function>
    29. <flex>
    30. <frequency-percentage>
    31. <frequency>
    32. <generic-family>
    33. <gradient>
    34. <hex-color>
    35. <hue-interpolation-method>
    36. <hue>
    37. <ident>
    38. <image>
    39. <integer>
    40. <length-percentage>
    41. <length>
    42. <line-style>
    43. <named-color>
    44. <number>
    45. <overflow-position>
    46. <overflow>
    47. <percentage>
    48. <position-area>
    49. <position>
    50. <ratio>
    51. <relative-size>
    52. <resolution>
    53. <rule-list>
    54. <self-position>
    55. <shape>
    56. <string>
    57. <system-color>
    58. <text-edge>
    59. <time-percentage>
    60. <time>
    61. <timeline-range-name>
    62. <transform-function>
    63. <url>
  59. Functions
    1. -moz-image-rect()
    2. abs()
    3. acos()
    4. alpha()
    5. anchor-size()
    6. anchor()
    7. asin()
    8. atan()
    9. atan2()
    10. attr()
    11. blur()
    12. brightness()
    13. calc-size()
    14. calc()
    15. circle()
    16. clamp()
    17. color-mix()
    18. color()
    19. conic-gradient()
    20. contrast-color()
    21. contrast()
    22. cos()
    23. counter()
    24. counters()
    25. cross-fade()
    26. cubic-bezier()
    27. device-cmyk()
    28. drop-shadow()
    29. dynamic-range-limit-mix()
    30. element()
    31. ellipse()
    32. env()
    33. exp()
    34. fit-content()
    35. grayscale()
    36. hsl()
    37. hue-rotate()
    38. hwb()
    39. hypot()
    40. if()
    41. image-set()
    42. image()
    43. inset()
    44. invert()
    45. lab()
    46. lch()
    47. light-dark()
    48. linear-gradient()
    49. linear()
    50. log()
    51. matrix()
    52. matrix3d()
    53. max()
    54. min()
    55. minmax()
    56. mod()
    57. oklab()
    58. oklch()
    59. opacity()
    60. paint()
    61. path()
    62. perspective()
    63. polygon()
    64. pow()
    65. progress()
    66. radial-gradient()
    67. random()
    68. ray()
    69. rect()
    70. rem()
    71. repeat()
    72. repeating-conic-gradient()
    73. repeating-linear-gradient()
    74. repeating-radial-gradient()
    75. rgb()
    76. rotate()
    77. rotate3d()
    78. rotateX()
    79. rotateY()
    80. rotateZ()
    81. round()
    82. saturate()
    83. scale()
    84. scale3d()
    85. scaleX()
    86. scaleY()
    87. scaleZ()
    88. sepia()
    89. shape()
    90. sibling-count()
    91. sibling-index()
    92. sign()
    93. sin()
    94. skew()
    95. skewX()
    96. skewY()
    97. sqrt()
    98. steps()
    99. superellipse()
    100. symbols()
    101. tan()
    102. translate()
    103. translate3d()
    104. translateX()
    105. translateY()
    106. translateZ()
    107. type()
    108. url()
    109. var()
    110. xywh()

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