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tab-size - CSS | MDN
tab-size
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since August 2021.
The tab-size CSS property is used to customize the width of tab characters (U+0009).
Try it
tab-size: 10px;
tab-size: 16px;
tab-size: 24px;
tab-size: 4;
<section id="default-example">
<pre id="example-element">	123</pre>
</section>
#example-element {
border: 1px solid;
}
Syntax
css
/* <number> 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: revert;
tab-size: revert-layer;
tab-size: unset;
Values
Formal definition
| Initial value | 8 |
|---|---|
| Applies to | block containers |
| Inherited | yes |
| Computed value | the specified integer or an absolute length |
| Animation type | a length |
Formal syntax
tab-size =
<number [0,∞]> |
<length [0,∞]>
Examples
Expanding by character count
css
pre {
tab-size: 4; /* Set tab size to 4 characters wide */
}
Collapse tabs
css
pre {
tab-size: 0; /* Remove indentation */
}
Default tab size vs custom sizes
This example compares a default tab size with a custom tab size. Note that white-space is set to pre to prevent the tabs from collapsing.
HTML
html
<p>no tab</p>
<p>	default tab size of 8 characters wide</p>
<p class="custom-number">	custom tab size of 3 characters wide</p>
<p> 3 spaces, equivalent to the custom tab size</p>
<p class="custom-length">	custom tab size of 50px wide</p>
CSS
body {
border: 1px solid red;
margin: 1rem;
}
css
p {
white-space: pre;
}
.custom-number {
tab-size: 3;
}
.custom-length {
tab-size: 50px;
}
Result
Specifications
| Specification |
|---|
| CSS Text Module Level 3 # tab-size-property |
Browser compatibility
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