inline-critical

Inline critical-path css and load the existing stylesheets asynchronously. Existing link tags will also be wrapped in <noscript> so the users with javascript disabled will see the site rendered normally.

Installation

This module is installed via npm:

$ npm install inline-critical

Example Usage

const inline = require('inline-critical');
const html = fs.readFileSync('test/fixtures/index.html', 'utf8');
const critical = fs.readFileSync('test/fixtures/critical.css', 'utf8');
const inlined = inline(html, critical);

Example Usage ignoring stylesheet per regex

const inline = require('inline-critical');
const html = fs.readFileSync('test/fixtures/index.html', 'utf8');
const critical = fs.readFileSync('test/fixtures/critical.css', 'utf8');

const inlined = inline(html, critical, {
  ignore: [/bootstrap/],
});

CLI

inline-critical works well with standard input. You can either pass in the html

cat index.html | inline-critical critical.css

or just flip things around

cat critical.css | inline-critical index.html

or pass in the file as an option

inline-critical critical.css index.html

without having to worry about the correct order

inline-critical index.html critical.css

Run inline-critical --help to see the list of options.

inline(html, styles, options?)

html is the HTML you want to use to inline your critical styles, or any other styles
styles are the styles you're looking to inline
options is an optional configuration object
- polyfill will use loadCSS polyfill instead of preferred media=print strategy (https://www.filamentgroup.com/lab/load-css-simpler/)
- preload will add preload tags
- minify will minify the styles before inlining (default: true)
- extract will remove the inlined styles from any stylesheets referenced in the HTML
- basePath will be used when extracting styles to find the files references by href attributes
- ignore ignore matching stylesheets when inlining.
- selector defines the element used by loadCSS as a reference for inlining.
- noscript specifies position of noscript fallback ('body' - end of body, 'head' - end of head, false - no noscript)

License

MIT

3.2 KiB Raw Permalink Blame History