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              <div class="container p-5">
  <section class="mb-5">
    <h1 class="mb-4">
      CSS-only double-click
    </h1>
    
    <p>
      Did you know it was possible to mimic the double-click behaviour in CSS? The only ingredients you need are some <code>&lt;a&gt;</code> tags that block the first click.
    </p>

    <p>
      I've used <code>&lt;a&gt;</code> tags with a <code>tabindex</code> because these where the only elements that are stylable in all browsers. Thanks <a href="https://twitter.com/cvrebert" target="_blank">Chris Rebert</a> for the reseach about <a href="https://gist.github.com/cvrebert/68659d0333a578d75372" target="_blank">click and focus behavior across browsers & OSes</a>.
      The <code>href</code> is removed to prevent navigation or page jumps (with #-links).
    </p>

    <p>
      As Don Caviness <a href="https://twitter.com/gis_golfer/status/1025513187767209985">pointed out</a>, Edge seem to behave a bit strange. It only works if you click - move the cursor a bit - and click again.
    </p>

    <p>
      If you want to find out how it works, you can set <code>$debug: true;</code> to enable debug mode.
    </p>
    
    <p class="alert alert-warning mb-4" role="alert">
      <strong>WARNING</strong>: this is just a demostration to show it's possible to use CSS for double-clicks. This technique has some accessibility issues (<a href="https://twitter.com/aardrian/status/1026518977676234752" target="_blank">see this tweet</a>). I woudn't recommend to use this. If you do want to use double-click, use <a href="https://www.w3schools.com/jsref/event_ondblclick.asp" target="_blank">javascript</a>.
    </p>

  </section>

  <section class="my-5">
    <h2>
      1. Double-click link
    </h2>

    <p>
      This
      <span class="doubleclick">
        <a href="https://www.google.com" target="_blank">link to google</a>
        <a tabindex="0" aria-hidden="true" class="doubleclick__layer doubleclick__layer-1"></a>
        <a tabindex="0" aria-hidden="true" class="doubleclick__layer doubleclick__layer-2"></a>
      </span> can only be opened by double clicking it.
    </p>

  </section>

  <section class="my-5">
    <h2>
      2. Double-click video
    </h2>
    <p>
      Double-click to play or pause the video.
    </p>
    <div class="doubleclick embed-responsive embed-responsive-16by9">
      <video controls="controls" width="640" height="360">
        <source src="https://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4" type="video/mp4" />
        <source src="https://clips.vorwaerts-gmbh.de/big_buck_bunny.webm" type="video/webm" />
        <source src="https://clips.vorwaerts-gmbh.de/big_buck_bunny.ogv" type="video/ogg" />
      </video>
      <a tabindex="0" aria-hidden="true" class="doubleclick__layer doubleclick__layer-1"></a>
      <a tabindex="0" aria-hidden="true" class="doubleclick__layer doubleclick__layer-2"></a>
    </div>
    <p class="mb-0 mt-2 small">
      Thanks <a href="https://gist.github.com/amineatallah/2469536" target="_blank">Amine Atallah</a> for providing this hosted video.
    </p>
  </section>

  <section class="my-5">
    <h2>
      3. Double-click youtube video
    </h2>
    <p>
      Double-click to play or pause the video. I've disabled the fullscreen mode, but if you enable this, the video will open fullscreen when you doubleclick it. Add the <code>allowfullscreen</code> attribute in this codepen to see this in action.
    </p>

    <div class="doubleclick embed-responsive embed-responsive-16by9">
      <iframe width="560" height="315" src="https://www.youtube.com/embed/dQw4w9WgXcQ" frameborder="0" allow="autoplay; encrypted-media"></iframe>
      <a tabindex="0" aria-hidden="true" class="doubleclick__layer doubleclick__layer-1"></a>
      <a tabindex="0" aria-hidden="true" class="doubleclick__layer doubleclick__layer-2"></a>
    </div>

  </section>

  <section class="my-5">
    <h2>
      4. Double-click to change text color of another element
    </h2>
    <p>
      This example may look very familiar if you've seen my pen with <a href="https://codepen.io/MartijnCuppens/pen/MBjqbM?editors=1100" target="_blank">stuff you can do with CSS pointer events</a>, but this example doesn't use the <code>pointer-events</code>      property but the <code>:focus-within</code> pseudo class. Not supported in IE & Edge at this moment (<a href="https://caniuse.com/#feat=css-focus-within" target="_blank">view supported browsers</a>).
    </p>

    <div class="doubleclick">
      <div class="d-flex flex-wrap focus-within">

        <div class="card mb-3 mr-3">
          <img class="card-img-top" height="180" width="286" alt="100%x180" src="data:image/svg+xml;charset=UTF-8,%3Csvg%20width%3D%22286%22%20height%3D%22180%22%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%20286%20180%22%20preserveAspectRatio%3D%22none%22%3E%3Cdefs%3E%3Cstyle%20type%3D%22text%2Fcss%22%3E%23holder_164b14928b4%20text%20%7B%20fill%3Argba(255%2C255%2C255%2C.75)%3Bfont-weight%3Anormal%3Bfont-family%3AHelvetica%2C%20monospace%3Bfont-size%3A14pt%20%7D%20%3C%2Fstyle%3E%3C%2Fdefs%3E%3Cg%20id%3D%22holder_164b14928b4%22%3E%3Crect%20width%3D%22286%22%20height%3D%22180%22%20fill%3D%22%23777%22%3E%3C%2Frect%3E%3Cg%3E%3Ctext%20x%3D%22107.203125%22%20y%3D%2296.3%22%3E286x180%3C%2Ftext%3E%3C%2Fg%3E%3C%2Fg%3E%3C%2Fsvg%3E">
          <div class="card-body">
            <h5 class="h6 card-title">Card 1</h5>
            <a tabindex="0" class="btn btn-primary js-btn">
              Double-click me
            </a>
          </div>
        </div>

        <div class="card mb-3 mr-3">
          <img class="card-img-top" height="180" width="286" alt="100%x180" src="data:image/svg+xml;charset=UTF-8,%3Csvg%20width%3D%22286%22%20height%3D%22180%22%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%20286%20180%22%20preserveAspectRatio%3D%22none%22%3E%3Cdefs%3E%3Cstyle%20type%3D%22text%2Fcss%22%3E%23holder_164b14928b4%20text%20%7B%20fill%3Argba(255%2C255%2C255%2C.75)%3Bfont-weight%3Anormal%3Bfont-family%3AHelvetica%2C%20monospace%3Bfont-size%3A14pt%20%7D%20%3C%2Fstyle%3E%3C%2Fdefs%3E%3Cg%20id%3D%22holder_164b14928b4%22%3E%3Crect%20width%3D%22286%22%20height%3D%22180%22%20fill%3D%22%23777%22%3E%3C%2Frect%3E%3Cg%3E%3Ctext%20x%3D%22107.203125%22%20y%3D%2296.3%22%3E286x180%3C%2Ftext%3E%3C%2Fg%3E%3C%2Fg%3E%3C%2Fsvg%3E">
          <div class="card-body">
            <h5 class="h6 card-title">Card 2</h5>
            <p class="card-text element">This text changes color if the button in card 1 is double-clicked.</p>
          </div>
        </div>

      </div>
      <a tabindex="0" aria-hidden="true" class="doubleclick__layer doubleclick__layer-1"></a>
      <a tabindex="0" aria-hidden="true" class="doubleclick__layer doubleclick__layer-2"></a>
    </div>
  </section>

  <section class="mt-5">
    <h2>
      That's all folks!
    </h2>
    <p>
      xoxo,<br> <a href="https://twitter.com/Martijn_Cuppens" target="_blank">@Martijn_Cuppens</a>
    </p>
    <p class="small mt-4">
      PS. make sure to check out <a href="https://github.com/project-rfs/rfs" target="_blank">RFS</a> to control your responsive font sizes.
    </p>
  </section>
</div>
            
          
!
            
              $debug: false;

.doubleclick {
  position: relative;
  overflow: if($debug, visible, hidden);

  &__layer {
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    width: 100%;
    opacity: if($debug, 0.75, 0);
    animation-delay: 0.5s;
    user-select: none;

    &-1 {
      background-color: red;
      transition-delay: 0.5s;
      transition-property: transform;

      &:focus {
        transform: translateX(-100%);
        transition-delay: 0s;

        + .doubleclick__layer-2 {
          animation-name: show;
          animation-fill-mode: forwards;
        }
      }
    }

    &-2 {
      background-color: green;
      transform: translateX(-100%);
    }
  }
}

@keyframes show {
  from {
    transform: none;
  }
  to {
    transform: none;
  }
}

// Focus within
.card {
  max-width: 286px;
}

.focus-within:focus-within {
  .element {
    color: #28a745;
  }
}

            
          
!
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