This only considers CSS contained in the HTML document inside <style> tags to be in use right now. Currently limited to modifying class and id attributes, so won't do anything with [data] or other attributes less commonly used in CSS.

npm install declassify

Example

var declassify = require('declassify');
var result = declassify.process(html);

Input:

<html>
    <head>
        <style>
            .used-class { color: red; }
            #used-id { color: blue; }
        </style>
    </head>
    <body class="unused" style="color: black;">
        <div class="used-class unused-class"></div>
        <div id="used-id"></div>
    </body>
</html>

Output:

<html>
    <head>
        <style>
            .used-class { color: red; }
            #used-id { color: blue; }
        </style>
    </head>
    <body style="color: black;"> // has removed class="unused"
        <div class="used-class"></div> // has removed unused-class
        <div id="used-id"></div>
    </body>
</html>

Options

var declassify = require('declassify');
var options = {
  ignore: [
    'ignored-class',
    /ignored-regex-class\-[0-9]+/,
    'ignored-id',
    /ignored-regex-id\-[0-9]+/
  ],
  attrs: ['id', 'class']
};
var result = declassify.process(html, options);

Input:

<html>
    <head>
        <style>
            .used-class { color: gray; }
        </style>
    </head>
    <body id="unused-id" class="unused-class">
        <div class="unused-class ignored-class ignored-regex-class-1"></div>
        <div class="used-class ignored-class ignored-regex-class-2"></div>
        <div id="ignored-id"></div>
        <div id="ignored-regex-id-1"></div>
    </body>
</html>

Output:

<html>
    <head>
        <style>
            .used-class { color: gray; }
        </style>
    </head>
    <body>
        <div class="ignored-class ignored-regex-class-1"></div>
        <div class="used-class ignored-class ignored-regex-class-2"></div>
        <div id="ignored-id"></div>
        <div id="ignored-regex-id-1"></div>
    </body>
</html>

There are some other methods exposed by the module which can be considered public and will be considered for versioning, but please see index.js if you think you might need to use any of them.

MIT Licensed

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Package last updated on 02 Dec 2017

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