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HTML

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CSS

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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

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JavaScript

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

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Babel includes JSX processing.

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HTML 

              
                <article>
  <input class='customLook' value='some.name@website.com'><button type="button">+</button>
</article>
!

CSS 

              
                article{    
  width: 100%;
  max-width: 700px;
}

.customLook{
  --tag-bg                  : #0052BF;
  --tag-hover               : #CE0078;
  --tag-text-color          : #FFF;
  --tags-border-color       : silver;
  --tag-text-color--edit    : #111;
  --tag-remove-bg           : var(--tag-hover);
  --tag-pad                 : .6em 1em;
  --tag-inset-shadow-size   : 1.4em; /* compensate for the larger --tag-pad value */
  --tag-remove-btn-color    : white;
  --tag-remove-btn-bg--hover: black;

  display: inline-block;
  min-width: 0;
  border: none;
}

.customLook .tagify__tag{
  margin-top: 0;
}

.customLook .tagify__tag > div{
  border-radius: 25px;
}

.customLook .tagify__tag:not(:only-of-type):not(.tagify__tag--editable):hover .tagify__tag-text{
  margin-inline-end: -1px;
}

/* Do not show the "remove tag" (x) button when only a single tag remains */
.customLook .tagify__tag:only-of-type .tagify__tag__removeBtn{
  display: none;
}

.customLook .tagify__tag__removeBtn{
  opacity: 0;
  transform: translateX(-100%) scale(.5);
  margin-inline: -20px 6px; /* very specific on purpose  */
  text-align: right;
  transition: .12s;
}

.customLook .tagify__tag:not(.tagify__tag--editable):hover .tagify__tag__removeBtn{
  transform: none;
  opacity: 1;
}

.customLook + button{
  color: #0052BF;
  font: bold 1.4em/1.65 Arial;
  border: 0;
  background: none;
  box-shadow: 0 0 0 2px inset currentColor;
  border-radius: 50%;
  width: 1.65em;
  height: 1.65em;
  cursor: pointer;
  outline: none;
  transition: .1s ease-out;
  margin: 0 0 0 5px;
  vertical-align: top;
}

.customLook + button:hover{
  box-shadow: 0 0 0 5px inset currentColor;
}

.customLook .tagify__input{
  display: none;
}
!

JS 

              
                // generate random whilist items (for the demo)
var randomStringsArr = Array.apply(null, Array(100)).map(function() {
  return Array.apply(null, Array(~~(Math.random() * 10  + 3))).map(function() {
    return String.fromCharCode(Math.random() * (123 - 97) + 97)
  }).join('') + '@gmail.com'
})

var input = document.querySelector('.customLook'),
    button = input.nextElementSibling,  // "add new tag" action-button
    tagify = new Tagify(input, {
      editTags: {
        keepInvalid: false, // better to auto-remove invalid tags which are in edit-mode (on blur)
      },
      // email address validation (https://stackoverflow.com/a/46181/104380)
      pattern: /^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/,
      whitelist: randomStringsArr,
      callbacks: {
        "invalid": onInvalidTag
      },
      dropdown : {
        position: 'text',
        enabled: 1 // show suggestions dropdown after 1 typed character
      }
    });

button.addEventListener("click", onAddButtonClick)

function onAddButtonClick(){
    tagify.addEmptyTag()
}

function onInvalidTag(e){
  console.log("invalid", e.detail)
}
!
999px

Console