Code Editor

Ace Editor (Javascript Mode)

You can find the offical website
      /**      * In fact, you're looking at ACE right now. Go ahead and play with it!  *       * We are currently showing off the JavaScript mode. ACE has support for 45      * language modes and 24 color themes!   */     function add(x, y) {            var resultString = "Hello, ACE! The result of your math is: ";          var result = x + y;             return resultString + result;   }       var addResult = add(3, 2);      console.log(addResult);

Ace Editor (Html Mode And Emmet)

You can find the offical website
<!--  * We are currently showing off the Html mode. ACE has support for 45    * language modes and 24 color themes!    -->    <!DOCTYPE html>      <html lang="en">     <head>       <title>ACE in Action</title>      <style>              #editor {                       position: absolute;                     top: 0;                 right: 0;                       bottom: 0;                      left: 0;                }       </style>     </head>      <body>       <div id="editor">function foo(items) {               var x = "All this is syntax highlighted";               return x;       }</div>      <script src="/ace-builds/src-noconflict/ace.js" charset="utf-8"></script> <script>             var editor = ace.edit("editor");                editor.setTheme("ace/theme/monokai");           editor.getSession().setMode("ace/mode/javascript");     </script>    </body>      </html>

Ace Editor (Css Editor)

You can find the offical website
            /* Some example CSS */          @import url("something.css");           body {          margin: 0;              padding: 3em 6em;               font-family: tahoma, arial, sans-serif;         color: #000;            }               #navigation a {         font-weight: bold;              text-decoration: none !important;               }               h1 {            font-size: 2.5em;               }               h2 {            font-size: 1.7em;               }               h1:before, h2:before {          content: "::";          }               code {          font-family: courier, monospace;                font-size: 80%;         color: #418A8A;         }