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/CSS

tab-size

This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

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

Browser compatibilityUpdate compatibility data on GitHub

	Desktop
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari
Basic support	21 21 This property is not yet animatable.	No	4 Prefixed 4 Prefixed Prefixed Requires the vendor prefix: -moz- See bug 737785 for the status of unprefixing this property. Before Firefox 53, this property was not animatable.	No	15 15 10.5 Prefixed Prefixed Requires the vendor prefix: -o-	6.1
`<length>`	42	No	53	No	29	No

	Mobile
	Android webview	Chrome for Android	Edge Mobile	Firefox for Android	Opera for Android	iOS Safari	Samsung Internet
Basic support	4.4	?	?	4 Prefixed 4 Prefixed Prefixed Requires the vendor prefix: -moz- See bug 737785 for the status of unprefixing this property. Before Firefox 53, this property was not animatable.	24 24 11.5 Prefixed Prefixed Requires the vendor prefix: -o-	7.1	?
`<length>`	56	?	?	53	37	No	?