sibling-count() CSS function
Limited availability
This feature is not Baseline because it does not work in some of the most widely-used browsers.
The sibling-count() CSS function returns an integer representing the total number of sibling DOM elements (direct children of the parent) of the element on which it is used, including itself.
Note:
The counter() function provides a similar result but it returns a <string> (which is more suitable for generated content, while sibling-count() returns an <integer> (which can be used for calculations).
Syntax
sibling-count()
Parameters
The sibling-count() function doesn't accept parameters.
Return value
An integer; the total number of sibling DOM elements including the element itself.
Examples
Dynamic column count
This example demonstrates setting the width of each item in a list based on the number of items, enabling placing each child in its own column.
HTML
We include a <ul> container and several <li> elements children.
<ul>
<li>One</li>
<li>Two</li>
<li>Three</li>
<li>Four</li>
<li>Five</li>
</ul>
CSS
We divide the width of each list item by the number of direct children the list contains. We also set every odd element to have a background-color to better demonstrate the resulting effect.
ul {
list-style-type: none;
padding: 0;
margin: 0;
text-align: center;
display: flex;
}
li {
width: calc(100% / sibling-count());
}
li:nth-of-type(odd) {
background-color: rgb(0 0 0 / 0.05);
}
Results
Specifications
| Specification |
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| CSS Values and Units Module Level 5 # funcdef-sibling-count |
Browser compatibility
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Legend
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- Full support
- Full support
- No support
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- See implementation notes.