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; }