css-what

March 14, 2026 ยท View on GitHub

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A CSS selector parser.

Example

import * as CSSwhat from "css-what";

CSSwhat.parse("foo[bar]:baz")

~> [
    [
        { type: "tag", name: "foo" },
        {
            type: "attribute",
            name: "bar",
            action: "exists",
            value: "",
            ignoreCase: null
        },
        { type: "pseudo", name: "baz", data: null }
    ]
]

API

CSSwhat.parse(selector) - Parses selector.

The function returns a two-dimensional array. The first array represents selectors separated by commas (eg. sub1, sub2), the second contains the relevant tokens for that selector. Possible token types are:

namepropertiesexampleoutput
tagnamediv{ type: 'tag', name: 'div' }
universal-*{ type: 'universal' }
pseudoname, data:name(data){ type: 'pseudo', name: 'name', data: 'data' }
pseudoname, data:name{ type: 'pseudo', name: 'name', data: null }
pseudo-elementname::name{ type: 'pseudo-element', name: 'name' }
attributename, action, value, ignoreCase[attr]{ type: 'attribute', name: 'attr', action: 'exists', value: '', ignoreCase: false }
attributename, action, value, ignoreCase[attr=val]{ type: 'attribute', name: 'attr', action: 'equals', value: 'val', ignoreCase: false }
attributename, action, value, ignoreCase[attr^=val]{ type: 'attribute', name: 'attr', action: 'start', value: 'val', ignoreCase: false }
attributename, action, value, ignoreCase[attr$=val]{ type: 'attribute', name: 'attr', action: 'end', value: 'val', ignoreCase: false }
child->{ type: 'child' }
parent-<{ type: 'parent' }
sibling-~{ type: 'sibling' }
adjacent-+{ type: 'adjacent' }
descendant-{ type: 'descendant' }
column-combinator-||{ type: 'column-combinator' }

CSSwhat.stringify(selector) - Turns selector back into a string.


License: BSD-2-Clause

Security contact information

To report a security vulnerability, please use the Tidelift security contact. Tidelift will coordinate the fix and disclosure.