tab-size

This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage 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 specification changes.

The tab-size CSS property is used to customize the width of a tab (U+0009) character.

/* <integer> values */
tab-size: 4;
tab-size: 0;
/* <length> values */
tab-size: 10px;
tab-size: 2em;
/* Global values */
tab-size: inherit;
tab-size: initial;
tab-size: unset;

Initial value	`8`
Applies to	block containers
Inherited	yes
Media	visual
Computed value	the specified integer or an absolute length
Animation type	a length
Canonical order	the unique non-ambiguous order defined by the formal grammar

Syntax

Values

<integer>: The number of spaces in a tab. Must be nonnegative.
<length>: The width of a tab. Must be nonnegative.

Formal syntax

<integer> | <length>

Examples

pre {
  tab-size: 4; /* Set tab size to 4 spaces */
}

pre {
  tab-size: 0; /* Remove indentation */
}

pre {
  tab-size: 2; /* Set tab size to 2 spaces */
}

Specifications

Specification	Status	Comment
CSS Text Module Level 3 The definition of 'tab-size' in that specification.	Working Draft	Initial definition

Feature	Chrome	Edge	Firefox (Gecko)	Internet Explorer	Opera	Safari
Basic support	21^[1]	No support	4.0 (2.0)-moz^[2]	No support	10.60-o 15^[1]	6.1
`<length>`	42	No support	53.0 (53.0)^[3]	No support	29	No support

Feature	Android	Firefox Mobile (Gecko)	IE Mobile	Opera Mini	Opera Mobile	Safari Mobile
Basic support	4.4	4.0 (2.0)^[2]	No support	5-o	11.5-o 24	7.1
`<length>`	56	53.0 (53.0)^[3]	No support	No support	37	No support

[1] The property is not yet animatable.

[2] The property is currently prefixed with -moz-. It will be unprefixed in bug 737785. The property was not animatable until 53.0 (bug 1308110).

[3] This was implemented in bug 943918; in addition, tab-size is now animatable.

Syntax

Values

Formal syntax

Examples

Specifications

Browser compatibility

See also

Document Tags and Contributors