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+# Specificity Calculator
+
+A JavaScript module for calculating and comparing the [specificity of CSS selectors](http://www.w3.org/TR/css3-selectors/#specificity). The module is used on the [Specificity Calculator](http://specificity.keegan.st/) website.
+
+Specificity Calculator is built for CSS Selectors Level 3. Specificity Calculator isn’t a CSS validator. If you enter invalid selectors it will return incorrect results. For example, the [negation pseudo-class](http://www.w3.org/TR/css3-selectors/#negation) may only take a simple selector as an argument. Using a psuedo-element or combinator as an argument for `:not()` is invalid CSS3 so Specificity Calculator will return incorrect results.
+
+
+## Front-end usage
+
+```js
+SPECIFICITY.calculate('ul#nav li.active a');   // [{ specificity: '0,1,1,3' }]
+```
+
+## Node.js usage
+
+```js
+var specificity = require('specificity');
+specificity.calculate('ul#nav li.active a');   // [{ specificity: '0,1,1,3' }]
+```
+
+## Passing in multiple selectors
+
+You can use comma separation to pass in multiple selectors:
+
+```js
+SPECIFICITY.calculate('ul#nav li.active a, body.ie7 .col_3 h2 ~ h2');   // [{ specificity: '0,1,1,3' }, { specificity: '0,0,2,3' }]
+```
+
+## Return values
+
+The `specificity.calculate` function returns an array containing a result object for each selector input. Each result object has the following properties:
+
+  * `selector`: the input
+  * `specificity`: the result as a string e.g. `0,1,0,0`
+  * `specificityArray`: the result as an array of numbers e.g. `[0, 1, 0, 0]`
+  * `parts`: array with details about each part of the selector that counts towards the specificity
+
+## Example
+
+```js
+var specificity = require('../'),
+    result = specificity.calculate('ul#nav li.active a');
+
+console.log(result);
+
+/* result =
+[ {
+    selector: 'ul#nav li.active a',
+    specificity: '0,1,1,3',
+    specificityArray: [0, 1, 1, 3],
+    parts: [
+      { selector: 'ul', type: 'c', index: 0, length: 2 },
+      { selector: '#nav', type: 'a', index: 2, length: 4 },
+      { selector: 'li', type: 'c', index: 5, length: 2 },
+      { selector: '.active', type: 'b', index: 8, length: 7 },
+      { selector: 'a', type: 'c', index: 13, length: 1 }
+    ]
+} ]
+*/
+```
+
+## Comparing two selectors
+
+Specificity Calculator also exposes a `compare` function. This function accepts two CSS selectors or specificity arrays, `a` and `b`.
+
+  * It returns `-1` if `a` has a lower specificity than `b`
+  * It returns `1` if `a` has a higher specificity than `b`
+  * It returns `0` if `a` has the same specificity than `b`
+
+```js
+SPECIFICITY.compare('div', '.active');         // -1
+SPECIFICITY.compare('#main', 'div');           // 1
+SPECIFICITY.compare('span', 'div');            // 0
+SPECIFICITY.compare('span', [0,0,0,1]);        // 0
+SPECIFICITY.compare('#main > div', [0,1,0,1]); // 0
+```
+
+## Ordering an array of selectors by specificity
+
+You can pass the `SPECIFICITY.compare` function to `Array.prototype.sort` to sort an array of CSS selectors by specificity.
+
+```js
+['#main', 'p', '.active'].sort(SPECIFICITY.compare);   // ['p', '.active', '#main']
+```
+
+## Command-line usage
+
+Run `npm install specificity` to install the module locally, or `npm install -g specificity` for global installation. You may need to elevate permissions by `sudo` for the latter. Run `specificity` without arguments to learn about its usage:
+
+```bash
+$ specificity
+Usage: specificity <selector>
+Computes specificity of a CSS selector.
+```
+
+Pass a selector as the first argument to get its specificity computed:
+
+```bash
+$ specificity "ul#nav li.active a"
+0,1,1,3
+```
+
+## Testing
+
+To install dependencies, run: `npm install`
+
+Then to test, run: `npm test`