This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for the proper prefixes to use in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the spec changes.


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. It corresponds to the padding-toppadding-rightpadding-bottom, or padding-left property depending on the values defined for writing-mode, direction, and text-orientation.

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

Initial value0
Applies toall elements
Percentageslogical-width of containing block
Computed valueas <length>
Canonical orderthe unique non-ambiguous order defined by the formal grammar


/* <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 */

/* Keyword value */
padding-block-start: auto;

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


The padding-block-start property takes the same values as the padding-left property.

Formal syntax



HTML Content

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

CSS Content

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

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


Specification Status Comment
CSS Logical Properties Level 1
The definition of 'padding-block-start' in that specification.
Editor's Draft Initial definition

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support Not supported 41.0 (41.0)[1] Not supported Not supported Not supported
Feature Android Firefox Mobile (Gecko) IE Phone Opera Mobile Safari Mobile
Basic support Not supported 41.0 (41.0)[1] Not supported Not supported Not supported

[1] Available since Gecko 38, but behind the preference layout.css.vertical-text.enabled, then disabled by default.

See also

Document Tags and Contributors

 Contributors to this page: Sebastianz, fscholz, teoli, kscarfone
 Last updated by: Sebastianz,