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HTML

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HTML preprocessors can make writing HTML more powerful or convenient. For instance, Markdown is designed to be easier to write and read for text documents and you could write a loop in Pug.

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Adding Classes

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About the <head>

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Insecure Resource

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CSS

About CSS Preprocessors

CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

Vendor Prefixing

About Vendor Prefixing

To get the best cross-browser support, it is a common practice to apply vendor prefixes to CSS properties and values that require them to work. For instance -webkit- or -moz-.

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JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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You can also link to another Pen here, and we'll pull the JavaScript from that Pen and include it. If it's using a matching preprocessor, we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.

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Packages

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Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.

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HTML 

              
                <input name='tags' class='some_class_name' placeholder='write some tags' value='css, html, javascript'>
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CSS 

              
                .tagify{    
  width: 100%;
  max-width: 700px;
}

.tags-look .tagify__dropdown__item{
  display: inline-block;
  border-radius: 3px;
  padding: .3em .5em;
  border: 1px solid #CCC;
  background: #F3F3F3;
  margin: .2em;
  font-size: .85em;
  color: black;
  transition: 0s;
}

.tags-look .tagify__dropdown__item--active{
  color: black;
}

.tags-look .tagify__dropdown__item:hover{
  background: lightyellow;
  border-color: gold;
}
!

JS 

              
                var input = document.querySelector('input[name="tags"]');

var whitelist = ["A# .NET", "A# (Axiom)", "A-0 System", "A+", "A++", "ABAP", "ABC", "ABC ALGOL", "ABSET", "ABSYS", "ACC", "Accent", "Ace DASL", "ACL2", "Avicsoft", "ACT-III", "Action!", "ActionScript", "Ada", "Adenine", "Agda", "Agilent VEE", "Agora", "AIMMS", "Alef", "ALF", "ALGOL 58", "ALGOL 60", "ALGOL 68", "ALGOL W", "Alice", "Alma-0", "AmbientTalk", "Amiga E", "AMOS", "AMPL", "Apex (Salesforce.com)", "APL", "AppleScript", "Arc", "ARexx", "Argus", "AspectJ", "Assembly language", "ATS", "Ateji PX", "AutoHotkey", "Autocoder", "AutoIt", "AutoLISP / Visual LISP", "Averest", "AWK", "Axum", "Active Server Pages", "ASP.NET", "B", "Babbage", "Bash", "BASIC", "bc", "BCPL", "BeanShell", "Batch (Windows/Dos)", "Bertrand", "BETA", "Bigwig", "Bistro", "BitC", "BLISS", "Blockly", "BlooP", "Blue", "Boo", "Boomerang", "Bourne shell (including bash and ksh)", "BREW", "BPEL", "B", "C--", "C++ – ISO/IEC 14882", "C# – ISO/IEC 23270", "C/AL", "Caché ObjectScript", "C Shell", "Caml", "Cayenne", "CDuce", "Cecil", "Cesil", "Céu", "Ceylon", "CFEngine", "CFML", "Cg", "Ch", "Chapel", "Charity", "Charm", "Chef", "CHILL", "CHIP-8", "chomski", "ChucK", "CICS", "Cilk", "Citrine (programming language)", "CL (IBM)", "Claire", "Clarion", "Clean", "Clipper", "CLIPS", "CLIST", "Clojure", "CLU", "CMS-2", "COBOL – ISO/IEC 1989", "CobolScript – COBOL Scripting language", "Cobra", "CODE", "CoffeeScript", "ColdFusion", "COMAL", "Combined Programming Language (CPL)", "COMIT", "Common Intermediate Language (CIL)", "Common Lisp (also known as CL)", "COMPASS", "Component Pascal", "Constraint Handling Rules (CHR)", "COMTRAN", "Converge", "Cool", "Coq", "Coral 66", "Corn", "CorVision", "COWSEL", "CPL", "CPL", "Cryptol", "csh", "Csound", "CSP", "CUDA", "Curl", "Curry", "Cybil", "Cyclone", "Cython", "Java", "Javascript", "M2001", "M4", "M#", "Machine code", "MAD (Michigan Algorithm Decoder)", "MAD/I", "Magik", "Magma", "make", "Maple", "MAPPER now part of BIS", "MARK-IV now VISION:BUILDER", "Mary", "MASM Microsoft Assembly x86", "MATH-MATIC", "Mathematica", "MATLAB", "Maxima (see also Macsyma)", "Max (Max Msp – Graphical Programming Environment)", "Maya (MEL)", "MDL", "Mercury", "Mesa", "Metafont", "Microcode", "MicroScript", "MIIS", "Milk (programming language)", "MIMIC", "Mirah", "Miranda", "MIVA Script", "ML", "Model 204", "Modelica", "Modula", "Modula-2", "Modula-3", "Mohol", "MOO", "Mortran", "Mouse", "MPD", "Mathcad", "MSIL – deprecated name for CIL", "MSL", "MUMPS", "Mystic Programming L"];

var tagify = new Tagify(input, {
      whitelist:whitelist,
      maxTags: 10,
      dropdown: {
        maxItems: 20,          
        classname: "tags-look", 
        enabled: 0,            
        closeOnSelect: false   
      }
    })
!
999px

Console