Pen Settings

HTML

About HTML Preprocessors

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.

Learn more · Versions

Adding Classes

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. So you don't have access to higher-up elements like the <html> tag. If you want to add classes there that can affect the whole document, this is the place to do it.

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.

!
Insecure Resource

The resource you are linking to is using the 'http' protocol, which may not work when the browser is using https.

CSS

About CSS Preprocessors

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

Learn more · Versions

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).

Add External Stylesheets/Pens

Any URL's added here will be added as <link>s in order, and before the CSS in the editor. If you link to another Pen, it will include the CSS from that Pen. If the preprocessor matches, it will attempt to combine them before processing.

Powered by Algolia
About External Resources

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.

If the stylesheet 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 CSS 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.

Learn more

+ add another resource

JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient. For instance, CoffeeScript can help prevent easy-to-make mistakes and offer a cleaner syntax and Babel can bring ECMAScript 6 features to browsers that only support ECMAScript 5.

Learn more · Versions

Babel is required to process package imports. If you need a different preprocessor remove all packages first.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

Powered by Algolia
About External Resources

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

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.

Learn more

+ add another resource

Behavior

Save Automatically?

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

Format on Save

If enabled, your code will be formatted when you actively save your Pen. Note: your code becomes un-folded during formatting.

Editor Settings

Code Indentation

Want to change your Syntax Highlighting theme, Fonts and more?

Visit your global Editor Settings.

HTML 

              
                <h1>HTML 5.2 <code>dialog</code> element examples</h1>

<p>Works natively in Chrome and Opera at present [08/01/2018].<br>JavaScript ES6 applied to support non-supporting browsers. <a class=lnk href="https://caniuse.com/#feat=dialog" target=_blank title="[new window]">Can I use: dialog</a></p>

<p class=dialogSupported>This browser supports <code>dialog</code></p>
<p class=noDialogSupport>This browser doesn't natively support <code>dialog</code></p>


<h2>Full screen modal: <code>dialog.showModal()</code></h2>

<dialog id=dialog_1>
<!--   <div class=content> -->
    <h2>Dialog one title</h2>
    <p>Dialog copy content with a <a class=lnk href>contained link</a> to test keyboard focus.</p>
    <p><kbd>TAB</kbd> key focus is locked into the modal.<br><kbd>ESC</kbd> or click button to exit.</p>
    <button>Exit dialog</button>
<!--   </div> -->
</dialog>
<button id=btn-dialog_1>Button one <small>(follows dialog one)</small></button>


<button id=btn-dialog_2>Button two <small>(precedes dialog two)</small></button>
<dialog id=dialog_2>
  <h2>Dialog 2 title</h2>
  <p>Dialog copy content with a <a class=lnk href>contained link</a> to test keyboard focus.</p>
  <p><kbd>TAB</kbd> key focus is locked into the modal.<br><kbd>ESC</kbd> or click button to exit.</p>
  <button>Exit dialog</button>
</dialog>


<h2>Local modal: <code>dialog.show()</code></h2>

<p>Purposefully swapped <code>button</code> positions. Both precede <code>dialog</code> HTML.</p>


<!-- Swapped button positions -->
<button id=btn-dialog_4 data-dialog-type=show>Dialog four</button>
<button id=btn-dialog_3 data-dialog-type=show>Dialog three</button>


<dialog id=dialog_3>
  <h2>Dialog 3 title</h2>
  <p>Dialog copy content with a <a class=lnk href>contained link</a> to test keyboard focus.</p>
  <button>Exit dialog</button>
</dialog>


<dialog id=dialog_4>
  <h2>Dialog 4 title</h2>
  <p>Dialog copy content with a <a class=lnk href>contained link</a> to test keyboard focus.</p>
  <button>Exit dialog</button>
</dialog>

<p>Note how <code>z-index</code> layering remains in source code order.</p>
<p>Note when multiple <code>dialog</code>s are open reclicking the <code>button</code> doesn't bring the <code>dialog</code> to the front.</p>
<!-- <p><a class=lnk href>Empty link</a> to test if exiting modal returns user to activating button.</p> -->

<h2>Added via JS</h2>
<ul>
  <li>Return focus to the activating button upon close.</li>
  <li>Keyboard trap implemented for <code>showModal()</code> but not <code>show()</code>.</li>
</ul>

<h2>Working on</h2>
<ul>
  <li>Currently investigating what should occur, keyboard chain wise, when opened via <code>show()</code>.</li>
<li>Requires full testing with Voiceover and JAWS. None done so far.</li>
</ul>




[[[https://codepen.io/2kool2/pen/mKeeGM]]]
!

CSS 

              
                @media (min-width: 40em) {
  :root {
    /* Rough responsive fonts */
    font-size: calc(1vw + 1vh + .5vmin);
  }
}
body {
  font-family: sans-serif;
  line-height: 1.5;
  text-align: center;
  padding-bottom: 2rem;
}
body {
  color: hsl(269,19%,30%);
  background-color: hsla(32,100%,85%,.35);
  background-image: url("data:image/svg+xml;charset=utf8,%3Csvg width='100%25' 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%3C!-- %3Cpath filter='url(%23a)' opacity='.3' d='M0 0h1200v256H0z'/%3E--%3E%3Crect filter='url(%23a)' opacity='.3' width='100%25' height='100%25'/%3E%3C/svg%3E");
}
h1,h2 {
  font-weight: 100;
  margin-top: 2rem;
  margin-bottom: 1rem;
}
p {
  max-width: 40em;
  margin: 1rem auto;
}
.lnk {
  color: hsl(211, 100%, 40%); /* Brightest WCAG against #DAE5F2 */
  text-decoration-skip: ink;
  text-decoration-color: hsla(211, 100%, 40%, .25);
  outline: 0 solid #fff;
  transition: background-color .3s;
}
.lnk:hover,
.lnk:focus {
  color: hsl(211, 100%, 46%); /* Brightest WCAG against #fff */
  background-color: #fff;
  text-decoration-color: hsla(211, 100%, 46%, 1);
  outline: .25rem solid #fff;
  transition: outline .3s;
}
kbd,
code {
  font-size: inherit;
  font-weight: 100;
  font-family: monospace, monospace;
  text-shadow: .03125em .03125em #fff;
  background-color: hsla(32,100%,100%,.35);
/*   outline: .25em solid hsla(32,100%,100%,.35); */
  padding: 0 .25em;
}
ul {
  max-width: 30em;
  text-align: left;
  margin: 1rem auto;
}

button {
  margin: 1rem;
  font-size: 1.25rem;
  padding: 1rem 1.5rem;
  color: inherit;
  background-color: hsla(32,100%,100%,.75);
  border: 1px solid #fff;
  box-shadow: 0 2px 4px rgba(0,0,0,.5);
  transition: all .3s ease-out;
  cursor: pointer;
}
button:hover {
  color: #000;
  background-color: hsla(32,100%,100%,1);
  box-shadow: 0 4px 8px rgba(0,0,0,.25);
}


dialog,
dialog[close],
dialog[aria-hidden="true"] {
/*   display: none; */
  visibility: hidden;
  opacity: 0;
  transition: 
    display 0s linear 2s,
    visibility 0s linear 2s,
    opacity 1s ease-out 0s;
}
dialog[open],
dialog[aria-hidden="false"]{
  display: block;
  visibility: visible;
  opacity: 1;
  color: inherit;
  background-color: hsla(32,50%,95%,1);
  transition: 
    display 0s linear 0s, 
    visibility 0s linear 0s, 
    opacity 1s ease-out 0s;
}
dialog::backdrop{
  background-color: hsla(32,50%,10%,.7);
}

/* Making a dialog work in unsupported browsers */
dialog {
  --spacing: 1rem;
  box-sizing: border-box;
  border: 2px solid #000;
  padding: var(--spacing);
}
dialog[aria-hidden][data-dialog-type="showModal"] {
  position: fixed;
  z-index: 20;
  top: 50%;
  left: 50%;
  transform: translate3d(-50%, -50%, 0);
}
dialog[aria-hidden][data-dialog-type="show"] {
  position: absolute;
  left: 50%;
  transform: translate3d(-50%, 0, 0);
}
.-js-dialogBg {
  position: fixed;
  z-index: 10;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background-color: hsla(32,50%,10%,.7);
}
.-js-dialogBg:hover {
  /* Stolen from trickle.js. SVGs will not work here */
  cursor: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAAAXNSR0IArs4c6QAAANpJREFUOBGNkz0KAjEQhYPYWXgCKws7LcXWyt7WG4i9jegBvIJ4AvEyXsRCsBDiN0sGkiE/O/A2O9n3viS7rPPeb9ETrVzPwrtHDzR1XF5I6oPWLQaeq5hDXQRw0I6xCuF5HH7Tz7oFuTkhrSyEhza8THaLoQhphpWUg/QOFyA/AFpy5nTbGrIjxvg4AiiGBzYc+rGZH9KPzFy+ZbX4bX9l+VDZr5NQMMbhbtvMxccpQ3JhpTchtXATQviItIpvW0CY7HHm8c9UDRd2chbABt3RQk2tEe8O3dDkD4JQ4iOR7BMpAAAAAElFTkSuQmCC"), pointer;
}
.dialogSupported,
.noDialogSupport {
  font-weight: bold;
}
.dialogSupported,
.supportsDialog .noDialogSupport {
  display: none;
}
.supportsDialog .dialogSupported {
  display: inline;
}
!

JS 

              
                
// Not required but useful
if (typeof HTMLDialogElement === "function") {
  document.documentElement.classList.add("supportsDialog");
}



(function() {

  "use strict";

  const bgClass = "-js-dialogBg";
  const dataAttr = "data-dialog-type";

  const _removeDialogBackground = () => {
    const bg = document.querySelector("." + bgClass);
    if (bg) {
      document.body.removeChild(bg);
    }
  };

  const _dialogClose = (dialog) => {
    if (dialog.close) {
      dialog.close();
    } else {
      dialog.setAttribute("aria-hidden", "true");
      _removeDialogBackground();
    }
    dialog.btnOpen.focus();
  };

  const _appendDialogBackground = (dialog) => {
    const bg = document.createElement("div");
    const hasBg = document.querySelector("." + bgClass);
    if (!hasBg) {
      bg.addEventListener("click", function() {
        _dialogClose(dialog);
      });
      bg.classList.add(bgClass);
      document.body.appendChild(bg);
    }
  };

  const _keydown_modal = (e) => {

    const target = e.target;
    const parentDialog = target.closest("dialog");

    if (!parentDialog) {
      return false;
    }

    // console.log(target.tagName, parentDialog.tagName);

    // ESC key on anything actionable
    if (e.which === 27) {
      _dialogClose(parentDialog);
    }

    // tab key and shift on the first element
    if (e.which === 9 && e.shiftKey && target === parentDialog.firstElementChild) {
      e.preventDefault();
      parentDialog.lastElementChild.focus();
    }

    // tab key and not shift on the last element.
    if (e.which === 9 && !e.shiftKey && target === parentDialog.lastElementChild) {
      e.preventDefault();
      parentDialog.firstElementChild.focus();
    }

  };

  const _showModal = (dialog) => {
    if (dialog.showModal) {
      dialog.showModal();
    } else {
      _appendDialogBackground(dialog);
      dialog.setAttribute("aria-hidden", "false");
      dialog.setAttribute(dataAttr, "showModal");
    }
    dialog.addEventListener("keydown", _keydown_modal, false);
  };

  const _show = (dialog) => {
    if (dialog.show) {
      dialog.show();
    } else {
      dialog.setAttribute("aria-hidden", "false");
      dialog.setAttribute(dataAttr, "show");
    }
  };

  const _dialogOpen = (dialog) => {
    const isShowModal = dialog.btnOpen.getAttribute(dataAttr) !== "show";
    if (isShowModal) {
      _showModal(dialog);
    } else {
      _show(dialog);
    }
    dialog.firstElementChild.focus();
  };


  const dialogs = document.querySelectorAll("dialog");
  for (const dialog of dialogs) {

    // Close button
    const btnClose = dialog.querySelector("button");
    if (btnClose) {
      btnClose.addEventListener("click", () => _dialogClose(dialog));
    }

    // Close when clicking on dialog::backdrop
    // Method and code from: https://codepen.io/keithjgrant/pen/eyMMVL
    // - Only works when a container inside completely fills the dialog.
    // - first-child focus would require adjustment to suit.
    // dialog.addEventListener('click', (event) => {
    //   console.log(event.target);
    //   if (event.target === dialog) {
    //     _dialogClose(dialog);
    //   }
    // }, false);

    // Open Button
    const btnOpen = document.getElementById("btn-" + dialog.id);
    if (btnOpen) {
      btnOpen.addEventListener("click", () => {
        dialog.btnOpen = btnOpen;
        _dialogOpen(dialog);
      });
    }

    // focussable first child
    const firstElement = dialog.firstElementChild;
    if (firstElement) {
      firstElement.setAttribute("tabindex", "0");
    }

  }

})();
!
999px

Console