emoji-font.css

/*
-----------------------------------
Emoji - natural display for the web
-----------------------------------

These font face definitions allows to display emoji glyphs intermingled with 
arbitrary characters outside emoji unicode blocks.


Usage
-----

<p style="font-family: emoji;">
You can mix text with em😶ji glyphs, like this one 💓, 
WITHOUT wrapping into any HTML tag. 💕
</p>

Known Limitations
-----------------

- See https://developer.mozilla.org/en-US/docs/Web/CSS/unicode-range 
  for unicode-range CSS descriptor compatibility.


Have fun!
*/

@font-face {
  font-family: emoji;
  
  /* Fonts for text outside emoji blocks */
  src: local('Droid Sans Mono'),
       local('Lucida Console'),
       local('Arial Monospaced'),
       local(Arial);
}

@font-face {
  font-family: emoji;

  src: local('Apple Color Emoji'),
       local('Android Emoji'),
       local('Segoe UI'),
       local(EmojiSymbols),
       local(Symbola),
       url('font/Symbola-Emoji.eot?#iefix') format('embedded-opentype'),
       url('font/Symbola-Emoji.woff') format('woff'),
       url('font/Symbola-Emoji.ttf') format('truetype');

  /* Emoji unicode blocks */
  unicode-range: U+1F300-1F5FF, U+1F600-1F64F, U+1F680-1F6FF, U+2600-26FF;
}

emoji.pe

#!/usr/bin/fontforge

/*

==================
Keeps Emoji Glyphs
==================

Usage:

$ chmod +x emoji.pe
$ ./emoji.pe

alternately

$ fontforge -script emoji.pe font.ttf emoji-font.ttf

*/

Open($argv[1]);
SelectNone();

SelectMore(0u1F300, 0u1F5FF);
SelectMore(0u1F600, 0u1F64F);
SelectMore(0u1F680, 0u1F6FF);
SelectMore(0u2600, 0u26FF);

SelectInvert();
Clear();

Generate($argv[2], "", 4);

@mhfarahmandm
its a webfont

Yes but these imports are missing from the gist.

   url('font/Symbola-Emoji.eot?#iefix') format('embedded-opentype'),
   url('font/Symbola-Emoji.woff') format('woff'),
   url('font/Symbola-Emoji.ttf') format('truetype');

These fonts are supposed to be generated using the posted emoji.pe Font Forge script.