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specificity
Advanced tools
The 'specificity' npm package is used to calculate the specificity of CSS selectors. Specificity is a measure of how specific a CSS selector is, which determines which styles are applied when multiple selectors match the same element.
Calculate Specificity
This feature allows you to calculate the specificity of a given CSS selector. The result will be an array of objects, each containing the selector and its specificity score.
const specificity = require('specificity');
const result = specificity.calculate('body div #content .article');
console.log(result);
Compare Specificity
This feature allows you to compare the specificity of two CSS selectors. The comparison result will indicate which selector is more specific.
const specificity = require('specificity');
const result1 = specificity.calculate('body div #content .article');
const result2 = specificity.calculate('body div .article');
const comparison = specificity.compare(result1[0].specificityArray, result2[0].specificityArray);
console.log(comparison);
The 'css-specificity' package also calculates the specificity of CSS selectors. It provides similar functionality to 'specificity' but with a different API. It is useful for developers who need to analyze and compare CSS selector specificity.
The 'css-selector-parser' package parses CSS selectors and can be used to analyze their structure. While it does not directly calculate specificity, it can be used in conjunction with other tools to achieve similar results.
A JavaScript module for calculating and comparing the specificity of CSS selectors. The module is used on the Specificity Calculator website.
Note that version 1 is a complete re-write with support for CSS Selectors Level 4, and has a different API than earlier versions.
selector
: string
- should be a valid CSS selectorA Specificity
object with a type of Record<"A" | "B" | "C", number>
.
calculate("#id");
{
A: 1,
B: 0,
C: 0
}
calculate(".classname");
{
A: 0,
B: 1,
C: 0
}
calculate("element");
{
A: 0,
B: 0,
C: 1
}
calculate('ul#nav li.active a');
{
A: 1,
B: 1,
C: 3
}
a
: Specificity
object with a type of Record<"A" | "B" | "C", number>
b
: Specificity
object with a type of Record<"A" | "B" | "C", number>
Returns a positive number if a
has a higher specificity than b
Returns a negative number if a
has a lower specificity than b
Returns 0
if a
has the same specificity than b
[
"element",
".classname",
"#id",
]
.map(calculate)
.sort(compare);
[ { A: 0, B: 0, C: 1 }, { A: 0, B: 1, C: 0 }, { A: 1, B: 0, C: 0 } ]
Same as compare
but returns the opposite value, for use in sorting specificity objects with the highest specificity first.
FAQs
Calculate the specificity of a CSS selector
The npm package specificity receives a total of 1,785,659 weekly downloads. As such, specificity popularity was classified as popular.
We found that specificity demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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