Experimental: 这是一个实验中的功能


The padding-inline-start CSS property defines the logical inline 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-start (en-US), padding-block-end (en-US), and padding-inline-end (en-US), which define the other paddings of the element.

适用元素all elements
Percentageslogical-width of containing block
计算值as length
Animation typea length


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

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

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


The padding-inline-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-inline-start: 20px;
  background-color: #C8C800;


规范 状态 注释
CSS Logical Properties and Values Level 1
Editor's Draft Initial definition


We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help! (en-US)

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 未实现[2] 41.0 (41.0)[1] 未实现 未实现 未实现[2]
Feature Android Firefox Mobile (Gecko) IE Phone Opera Mobile Safari Mobile
Basic support 未实现 41.0 (41.0)[1] 未实现 未实现 未实现

[1] Available since Gecko 38, but behind the preference layout.css.vertical-text.enabled, then disabled by default. The preference has been removed in Gecko 51 and this property cannot be disabled since this version. From Firefox 3, Gecko supports the prefixed -moz-padding-start.

[2] From Chrome 2 and Safari 3, the similar prefixed -webkit-padding-start are supported.