The padding-block-start CSS property defines the logical block start padding of an element, which maps to a physical padding depending on the element's writing mode, directionality, and text orientation.


/* <length> values */
padding-block-start: 10px;      /* An absolute length */
padding-block-start: 1em;       /* A length relative to the text size */

/* <percentage> value */
padding-block-start: 5%;        /* A padding relative to the block container's width */

/* Global values */
padding-block-start: inherit;
padding-block-start: initial;
padding-block-start: revert;
padding-block-start: unset;



The size of the padding as a fixed value. Must be nonnegative.


The size of the padding as a percentage, relative to the inline-size of the containing block. Must be nonnegative.


The padding-block-start property is defined in the specification as taking the same values as the padding-top property. However, the phsyical property it maps to depends on the values set for writing-mode, direction, and text-orientation. Therefore, it could map to padding-top, padding-right, or padding-left

It relates to padding-block-end, padding-inline-start, and padding-inline-end, which define the other paddings of the element.

Formal definition

Initial value0
Applies toall elements
Percentageslogical-width of containing block
Computed valueas <length>
Animation typea length

Formal syntax



Setting block start padding for vertical text


  <p class="exampleText">Example text</p>


div {
  background-color: yellow;
  width: 120px;
  height: 120px;

.exampleText {
  writing-mode: vertical-lr;
  padding-block-start: 20px;
  background-color: #C8C800;



CSS Logical Properties and Values Level 1 (CSS Logical Properties 1)
# padding-properties

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See also