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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>

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. If you need things in the <head> of the document, put that code here.

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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-.

We offer two popular choices: Autoprefixer (which processes your CSS server-side) and -prefix-free (which applies prefixes via a script, client-side).

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You can apply CSS to your Pen from any stylesheet on the web. Just put a URL to it here and we'll apply it, in the order you have them, before the CSS in the Pen itself.

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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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If the script you link to has the file extension of a preprocessor, we'll attempt to process it before applying.

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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Using packages here is powered by Skypack, which makes packages from npm not only available on a CDN, but prepares them for native JavaScript ES6 import usage.

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HTML 

              
                <main>

  <h1>Escaping HTML symbols/entities</h1>
  <p>To allow the embedding of code examples into web pages.</p>
  <p>Replaces &lt; &gt; and &amp; with &amp;lt; &amp;gt; and &amp;amp; then copies the result to the clipboard.</p>

  <form id=converter class=frm>

    <label class=frm_lbl for=textarea data-lbl-text="Escaped HTML result, copied to clipboard">Input HTML, CSS, JavaScript, or markup:</label>
    <textarea class=frm_txtr id=textarea placeholder="Paste HTML here, then click 'Convert &amp; Copy'" spellcheck=false></textarea>

    <div class=frm_buttons>

      <button class=btn-convert data-clipboard-target=#textarea data-btn-text="Copied to clipboard">Convert<span class=-visually-hidden> HTML into escaped HTML</span> &amp; Copy<span class=-visually-hidden> the result to the clipboard</span></button>

      <button disabled class=btn-reset data-reset-target=#textarea>Reset<span class=-visually-hidden> the form</span></button>

    </div>
  </form>

  <p>Permanent online tool: <a href="https://websemantics.uk/tools/escaping-html/" target=_blank title="[new window]">Escape HTML</a></p>

</main>

<!-- Codepen footer include -->
[[[https://codepen.io/2kool2/pen/mKeeGM]]]
!

CSS 

              
                *, *::after, *::before {box-sizing: inherit;}
body {
  --color: hsl(269, 19%, 30%);
  --bgColor: hsla(32,100%,85%,.35);
  --linkColor: hsla(214, 71%, 47%, 1);
  --linkColorUnderline: hsla(214, 71%, 47%, .5);
  --linkColorHover: hsla(214, 100%, 35%, 1);
  --linkBgHover: hsla(214, 100%, 85%, 1);
  --linkFocus: hsla(214, 71%, 80%, 0.3);
  --focusOutline: hsla(214, 71%, 85%, 1);

  --textShadow: #fff;
  --boxShadow: hsla(0,0%,0%,.3);
  --bgColorForm: hsla(120,50%,50%,.075);

  font-family: sans-serif;
  text-rendering: optimizeLegibility;
  margin: 1rem;
  line-height: 1.5;
  padding-bottom: 2rem;
  background-attachment: fixed;
  background-image: url("data:image/svg+xml;charset=utf8,%3Csvg xmlns='http://www.w3.org/2000/svg'%3E%3Cdefs%3E%3Cfilter id='a'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.4'/%3E%3C/filter%3E%3C/defs%3E%3Crect filter='url(%23a)' opacity='.3' width='100%25' height='100%25'/%3E%3C/svg%3E");

  min-height: 100%;
  color: var(--color);
  background-color: var(--bgColor);
}
main {
  max-width: 36rem;
  margin: 0 auto;
}
h1 {
  font-weight: 100;
  margin-top: 2rem;
  margin-bottom: 1rem;
  text-align: center;
}
h1 + p {
  font-size: 1.35rem;
  font-weight: 100;
  text-align: center;
}
h2 {
  font-weight: 400;
  margin-top: 3rem;
  margin-bottom: 1rem;
  text-align: center;
}
p {
  text-align: center;
  font-size: 1.125rem;
}
ul, p {
  max-width: 40rem;
  margin: 1em auto;
}
li {
  margin:.25rem 0;
}
figure {
  margin: 2rem auto;
  max-width: 40rem;
}
figure + figure {
  margin-top: 3rem;
  }
figcaption {
  font-size: 1.25rem;
  font-weight: 100;
}
a:link,
a:visited {
  color: var(--linkColor);
  text-decoration-color: var(--linkColorUnderline);
  outline: hsla(214, 71%, 80%, 0); solid .25rem;
  transition:
    color .3s ease-out,
    background-color .3s ease-out,
    outline-color .3s ease-out;
}
a:hover,
a:focus {
  color: var(--linkColorHover);
  outline: var(--linkBgHover) solid .25rem;
  background-color: var(--linkBgHover);
}

/* Specifics */

.-visually-hidden {
  position: absolute !important;
  clip: rect(1px,1px,1px,1px);
  padding: 0 !important;
  border: 0 !important;
  height: 1px !important;
  width: 1px !important;
  overflow: hidden;
}

.frm {
  background-color: var(--bgColorForm);
  border: 2px dashed #f90;
  padding: .6rem 1rem 1rem;
  max-width: 40rem;
  margin: 0 auto;
}
.frm_lbl {
  display: block;
  margin: 0 0 .25rem;
}
.frm_txtr {
  position: relative;
  display: block;
  margin: 0;
  padding: 0.75rem 0.5rem 0 2.5rem;
  border: 1px solid #ddd;

  font-size: inherit;
  font-family: monospace, monospace;
  text-shadow: 0 1px var(--textShadow);
  letter-spacing: 0.01em;
  text-align: left;
  white-space: pre;
  text-overflow: ellipsis;
  word-spacing: normal;
  word-break: normal;
  word-wrap: normal;
  line-height: 2;
  tab-size: 2;
  hyphens: none;
  overflow: auto;

  min-height: 15rem;
  resize: both;
  min-width: calc(100% - 3rem);

  background-color: transparent;
  background-image: url("data:image/svg+xml;charset=utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' fill-rule='evenodd' viewBox='0 0 1920 64'%3E%3Cpath fill='%23fcfcfa' d='M1920 64H0V0h1920v64zM20 36a11 11 0 110 22 11 11 0 010-22z'/%3E%3Cpath stroke='%23edf3ed' stroke-width='2.6' d='M0 1h1920M0 5h1920M0 9h1920M0 13h1920M0 17h1920M0 21h1920M0 25h1920M0 29h1920'/%3E%3Cpath stroke='%23e4ede4' stroke-dasharray='2 6 2 6' stroke-width='2' d='M40 2v60'/%3E%3Cpath fill-opacity='.2' d='M20 36c6 0 11 5 11 11s-5 11-11 11S9 53 9 47s5-11 11-11zm8 6a10 10 0 00-16 0c-2 2-2 4-2 6 0 6 4 10 10 10s10-4 10-10c0-2 0-4-2-6z'/%3E%3C/svg%3E");
  background-attachment: local;
  background-size: 120rem 4rem;
  background-position: top -1.2rem left 0;
}
.frm_txtr:focus {
  outline-offset: calc(-0.25rem - 1px);
  outline: var(--focusOutline) solid 0.25rem;
  z-index: 5;
}
.frm_txtr:hover, .frm_txtr:focusn {
  box-shadow: 0 .25rem .25rem var(--boxShadow);
}


/* Buttons */
button::-moz-focus-inner {
  border: 0;
}
.frm_buttons {
  display: flex;
  justify-content: space-around;
}
.btn-convert,
.btn-reset {
  font-size: inherit;
  margin: 1rem 0 0;
  cursor: pointer;
  position: relative;
  display: inline-block;
  padding: .618rem 1.618rem;
  letter-spacing: 1px;
  text-shadow: rgba(0,0,0,.9) 0 1px 2px;
  color: #fff;
  background-color: #434343;
  border: 1px solid #242424;
  border-radius: 4px;
  box-shadow:
    rgba(255,255,255,.25) 0 1px 0,
    inset rgba(255,255,255,.25) 0 1px 0,
    inset rgba(0,0,0,.5) 0 0 0,
    inset rgba(255,255,255,.08) 0 1.25rem 0,
    inset rgba(0,0,0,.3) 0 -1.25rem 1.25rem,
    inset rgba(255,255,255,.1) 0 1.25rem 1.25rem;
  transition: all .2s linear;
}
.btn-convert {
  background-color: #c75000;
}
.btn-copied {
  background-color: #477343;
  border: 1px solid #242424;
}
.btn-reset {}
[disabled] {
  opacity: 0.25;
  pointer-events: none;
}
!

JS 

              
                var supportsES6=(function(){try{new Function('(a=0)=>a');return true}catch(e){console.log('No ES6');return false}}());



var Convert_Html_Entities = (function (window, document, supportsES6) {

  'use strict';
  if (!supportsES6) return;

  const form = document.querySelector('.frm');
  const label = document.querySelector('.frm_lbl');
  const textArea = document.getElementById('textarea');
  const btnConvert = document.querySelector('.btn-convert');
  const btnReset = document.querySelector('.btn-reset');

  if (!form || !label || !textArea || !btnConvert || !btnReset) return;

  const submit = e => e.preventDefault();

  const initialLabelText = label.innerHTML;

  const replaceHtmlEntities = str => str.replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;');

  const copy = _ => {
    new ClipboardJS('.btn-convert');
    const btnText = btnConvert.innerHTML;
    btnConvert.innerHTML = btnConvert.getAttribute('data-btn-text');
    btnConvert.classList.add('btn-copied');
    setTimeout(_ => {
      btnConvert.setAttribute('disabled', 'true');
      btnConvert.classList.remove('btn-copied');
      btnConvert.innerHTML = btnText;
      btnReset.removeAttribute('disabled');
    }, 2000);
  };

  const convert = _ => {
    if (textArea.value.length < 1) return;
    textArea.value = replaceHtmlEntities(textArea.value);
    label.textContent = label.getAttribute('data-lbl-text');
    copy();
  };

  const reset = _ => {
    textArea.value = '';
    label.textContent = initialLabelText;
    btnConvert.removeAttribute('disabled');
    btnReset.setAttribute('disabled', 'true');
  };

  form.addEventListener('submit', submit);
  btnConvert.addEventListener('click', convert);
  btnReset.addEventListener('click', reset);

}(window, document, supportsES6));


// Included - Copy to clipboard.js
// https://cdn.jsdelivr.net/npm/[email protected]/dist/clipboard.min.js
!
999px

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