`padding-block-start` 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 September 2021.

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.

Try it

padding-block-start: 20px;
writing-mode: horizontal-tb;

padding-block-start: 20px;
writing-mode: vertical-rl;

padding-block-start: 5em;
writing-mode: horizontal-tb;

padding-block-start: 5em;
writing-mode: vertical-lr;

<section id="default-example">
  <div class="transition-all" id="example-element">
    <div class="box">
      Far out in the uncharted backwaters of the unfashionable end of the
      western spiral arm of the Galaxy lies a small unregarded yellow sun.
    </div>
  </div>
</section>

#example-element {
  border: 10px solid #ffc129;
  overflow: hidden;
  text-align: left;
}

.box {
  border: dashed 1px;
  unicode-bidi: bidi-override;
}

Syntax

/* <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: revert-layer;
padding-block-start: unset;

Values

<length>: The size of the padding as a fixed value. Must be non-negative.
<percentage>: The size of the padding as a percentage, relative to the inline-size (width in a horizontal language) of the containing block. Must be non-negative.

Description

The padding-block-start property takes the same values as physical padding properties such as padding-top. However, it can be equivalent to padding-top, padding-bottom, padding-left, or padding-right depending on the values set for writing-mode, direction, and text-orientation.

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

Formal definition

Initial value	0
Applies to	all elements, except <code>table-row-group</code>, <code>table-header-group</code>, <code>table-footer-group</code>, <code>table-row</code>, <code>table-column-group</code> and <code>table-column</code>
Inherited	no
Percentages	logical-width of containing block
Computed value	as `<length>`
Animation type	a <a href="/en-US/docs/Web/CSS/Reference/Values/length#interpolation" title="Values of the <length> CSS data type are interpolated as real, floating-point numbers.">length</a>

Formal syntax

padding-block-start = 
  <'padding-top'>

Examples

Setting block start padding for vertical text

HTML

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

CSS

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

.exampleText {
  writing-mode: vertical-lr;
  padding-block-start: 20px;
  background-color: #c8c800;
}

Result

Specifications

Specification
CSS Logical Properties and Values Module Level 1 # padding-properties

Browser compatibility

	Desktop					Mobile
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on iOS	Samsung Internet	WebView Android	WebView on iOS
`padding-block-start`	69	79	41	56	12.1	69	41	48	12.2	10.0	69	12.2