inliner

Utility to inline images, CSS and JavaScript for a web page - useful for mobile sites

npm install inliner
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Inliner

Turns your web page to a single HTML file with everything inlined - perfect for appcache manifests on mobile devices that you want to reduce those http requests.

What it does

  • Get a list of all the assets required to drive the page: CSS, JavaScript, images and images used in CSS
  • Minify JavaScript (via uglify-js)
  • Strips white from CSS
  • Base64 encode images
  • Puts everything back together as a single HTML file with a simplfied doctype

Installation

Check out a working copy of the source code with Git, or install inliner via npm (the recommended way). The latter will also install inliner into the system's bin path.

$ npm install inliner -g

Or

$ git clone https://github.com/remy/inliner.git

inliner uses a package.json to describe the dependancies, and if you install via a github clone, ensure you run npm install from the inliner directory to install the dependancies (or manually install jsdom and uglify-js).

Usage

If you have either installed via npm or put the inliner bin directory in your path, then you can use inliner via the command line as per:

inliner http://remysharp.com

This will output the inlined markup with default options. You can see more options on how to disable compression or how not to base64 encode images using the help:

inliner --help

To use inline inside your own script:

var Inliner = require('inliner');

new Inliner('http://remysharp.com', function (html) {
  // compressed and inlined HTML page
  console.log(html);
});

Or:

var inliner = new Inliner('http://remysharp.com');

inliner.on('progress', function (event) {
  console.error(event);
}).on('end', function (html) {
  // compressed and inlined HTML page
  console.log(html);      
});

Note that if you include the inliner script via a git submodule, it requires jsdom & uglifyjs to be installed via npm install jsdom uglify-js, otherwise you should be good to run.

Once you've inlined the crap out of the page, add the manifest="self.appcache" to the html tag and create an empty file called self.appcache (read more).

Support

  • Collapses all white space in HTML (except inside <pre> elements)
  • Strips all HTML comments
  • Pulls JavaScript and CSS inline to HTML
  • Compresses JavaScript via uglify (if not compressed already)
  • Converts all images to based64 data urls, both inline images and CSS images
  • Imports all @import rules from CSS (recusively)
  • Applies media query rules (for print, tv, etc media types)
  • Leaves conditional comments in place
  • If JavaScript can't be imported (or is Google Analytics), source is not put inline

Limitations / Caveats

  • Whitespace compression might get a little heavy handed - all whitespace is collapsed from n spaces to one space.
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