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;
                    }