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HTML

              
                <div id="body">
<div id="app">
  <h1>
    Settings
  </h1>
  <p style="font-size: .825em; margin-top: -.5em;">
    This demo works in Firefox 63+, Chrome, and Safari 12+.
  </p>
  <ul class="settings-list">
    <li>
      <switch-btn
                  id="enable_all"
                  text="Enable Settings"
                  switch="force"
                  labelled-state>
      </switch-btn>
    </li>
    <li>
      <switch-btn
                  id="drk_mode"
                  text="Enable Dark Mode"
                  switch="force"
                  check
                  disable>
      </switch-btn>
    </li>
    <li>
      <switch-btn
                  id="remove_transitions"
                  text="Remove Background Transition"
                  switch="force"
                  disable>
      </switch-btn>
    </li>
    <li>
      <switch-btn
                  id="reveal"
                  text='Show "On/Off" Labels'
                  switch="force"
                  disable>
      </switch-btn>
    </li>
  </ul>
</div>

<style id="switch_styles">
  button::-moz-focus-inner {
    border-style: none;
    padding: 0;
  }

  .switch-btn {
    background: none;
    border: 0;
    color: inherit;
    font: inherit;
    line-height: 1;
    padding: .75em 3.75em .75em .5em;
    position: relative;
    text-align: left;
    width: 100%;
  }

  .switch-btn span {
    pointer-events: none;
  }

  .switch-btn__knob {
    background: #fff;
    border-radius: 1em;
    border: 1px solid #2a2a2a;
    bottom: .5em;
    box-shadow: inset -1.625em 0 0 1px rgba(120, 120, 120, 1);
    height: 1.5em;
    margin: auto;
    position: absolute;
    right: 0;
    top: .5em;
    transition:
      border .2s ease-in-out,
      box-shadow .2s ease-in-out;
    width: 3em;
  }

  .switch-btn[aria-checked="true"] .switch-btn__knob {
    border: 1px solid rgba(0, 2, 120, 1);
    box-shadow: inset 1.625em 0 0 1px #2196f3;
  }

  .switch-btn[disabled] {
    opacity: .525;
  }

  .switch-btn__knob:before {
    border: 2px solid;
    border-color: rgba(33, 150, 243, 0);
    border-radius: 1em;
    bottom: 0;
    content: "";
    left: 0em;
    position: absolute;
    right: 0em;
    top: 0em;
    transition:
      border-color .2s ease-in-out,
      bottom .2s ease-in-out,
      left .2s ease-in-out,
      right .2s ease-in-out,
      top .2s ease-in-out;
  }

  .switch-btn:focus .switch-btn__knob:before {
    border-color: rgba(33, 150, 243, 1);
    bottom: -.325em;
    left: -.325em;
    right: -.325em;
    top: -.325em;
  }

  .switch-btn--show-labels {
    padding-right: 4.5em;
  }

  .switch-btn--show-labels .switch-btn__knob {
    box-shadow: inset -2.05em 0 0 1px rgba(120, 120, 120, 1);
    width: 3.5em;
  }

  .switch-btn--show-labels[aria-checked="true"] .switch-btn__knob {
    box-shadow: inset 2.05em 0 0 1px #2196f3;
  }

  .switch-btn--show-labels .switch-btn__knob:after {
    color: #fff;
    content: "Off";
    display: block;
    font-size: .825em;
    line-height: 1.825;
    padding: 0 .5em;
    text-align: right;
  }

  .switch-btn--show-labels[aria-checked="true"] .switch-btn__knob:after {
    content: "On";
    text-align: left;
  }

  @media ( prefers-reduced-motion: reduce ) {
    .switch-btn__knob:before,
    .switch-btn__knob {
      transition: none;
    }
  }

  @media screen and ( -ms-high-contrast: active ) {
    .switch-btn__knob:after {
      background-color: windowText;
    }
  }
</style>
</div> <!-- /#body -->
              
            
!

CSS

              
                /**
 * Demo styles
 */
*,
*:before,
*:after {
  box-sizing: border-box;
}

body {
  background: #ccc;
  font-family: Helvetica, Arial;
}

body.transition {
  transition: background .42s ease-in-out;
}

h1 {
  margin-top: 0;
}

#app {
  background: #fefefe;
  border-radius: 2px;
  color: #111;
  margin: 1em auto;
  max-width: 25em;
  padding: 1.5em;
}

#app.transition {
  transition:
    background .42s ease-in-out,
    color .42s ease-in-out;
}

.settings-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.setting-list li:before {
  content: "\200B";
  position: absolute;
  /*
    see: unfetteredthoughts.net/2017/09/26/voiceover-and-list-style-type-none
  */
}

.settings-list li:not(:last-child) {
  border-bottom: 1px solid #555;
  margin: 0;
}

.desc-ex {
  font-size: .825rem;
  margin-top: .125em;
  padding-left: .5rem;
}

/**
 * Dark Mode Styles
 */
.dark-mode {
  background: #1a2a2a;
}

.dark-mode #app {
  background: rgba(100,100,100,.2);
  color: #eee;
}


/**
 * Reduced Motion Prefs
 */
@media ( prefers-reduced-motion: reduce ) {
  body.transition,
  .transition #app {
    transition: none;
  }
}

              
            
!

JS

              
                /**
  Creating the custom Switch 
*/
(function ( doc, w ) {
  /**
   * Write the CSS as CSS, because CSS.
   * Store it for pulling into the Switch's template.
   */
  const switchStyles = doc.getElementById('switch_styles').innerHTML;

  /**
   * Build a reusable template to serve as the
   * base for each instance of the switch.
   *
   * A button element serves a the base here due to unexpected
   * announcements (redundant label announcements, and the 
   * incorrect state of "read only") that were being made when
   * testing with the JAWS screen reader.
   */
  const switchTemplate = doc.createElement('template');
  switchTemplate.innerHTML = '<style>' + switchStyles + '</style>' + `
    <button type="button" class="switch-btn">
      <!-- role presentation is needed to ensure NVDA won't have redundant announcements -->
      <span class="switch-btn__text" role="presentation"></span>
      <span class="switch-btn__knob" aria-hidden="true"></span>
      <!-- hide the knob, especially since it can have "on" and "off" CSS content that 
           we don't want announced -->
    </button>
  `;

  /**
   * Define the custom element
   */
  let btn;
  let text;

  class switchBtn extends HTMLElement {
    constructor () {
      super();

      this._shadowRoot = this.attachShadow({ mode: 'open' });
      this._shadowRoot.appendChild(switchTemplate.content.cloneNode(true));
      btn = this.$btn = this._shadowRoot.querySelector('.switch-btn');
      text = this.$text = this._shadowRoot.querySelector('.switch-btn__text');

      btn.addEventListener('click', function () {
        this.setAttribute('aria-checked', this.getAttribute('aria-checked') === 'true' ? 'false' : 'true');
      });
    }

    connectedCallback() {
      const accName = this.getAttribute('text');

      if ( accName && accName !== '' ) {
        text.innerHTML = accName;
      }
      else {
        // Controls need names. Give it a name!
        text.innerHTML = "Give me a name!";
        console.warn('Provide a "text" value.')
      }
      if ( this.hasAttribute('check') ) {
        btn.setAttribute('aria-checked', 'true');
      }
      else {
        btn.setAttribute('aria-checked', 'false');
      }
      if ( this.hasAttribute('disable') ) btn.disabled = true;
      if ( this.hasAttribute('switch') ) btn.setAttribute('role', 'switch');
      if ( this.hasAttribute('labelled-state') ) btn.classList.add('switch-btn--show-labels');
    }
  }

  customElements.define('switch-btn', switchBtn);
})( document, window, undefined );






/**
  The following creates the individual funtionality 
  for each switch control. It is not essential to 
  the general creation of the switch custom element
  and its baseline functionality.
*/
(function ( doc, w ) {
/**
 * When custom elements have open Shadow DOMs, this means that
 * these elements can be written in a generic manner without
 * worrying about how each instance might need to be used
 * beyond their general UX.
 *
 * This demo file shows how once all the custom elements are in
 * place, targeted JavaScript can be written to pierce unique
 * custom element's Shadow DOMs, and change the state of the
 * web components, as well as content outside of them.
 */


  /**
   * Keep track of all the necessary elements.
   */
  /* Light DOM */
  const body              = doc.getElementsByTagName('BODY')[0];
  const app               = doc.getElementById('app');

  const darkModeDesc      = doc.getElementById('dark_desc');
  const revealDesc        = doc.getElementById('reveal_desc');

  const settingsSwitch    = doc.getElementById('enable_all');
  const darkSwitch        = doc.getElementById('drk_mode')
  const transitionSwitch  = doc.getElementById('remove_transitions');
  const descSwitch        = doc.getElementById('reveal');

  /* Shadow DOM */
  const settingsBtn     = settingsSwitch.shadowRoot.querySelector('.switch-btn');
  const darkModeBtn     = darkSwitch.shadowRoot.querySelector('.switch-btn');
  const transitionsBtn  = transitionSwitch.shadowRoot.querySelector('.switch-btn');
  const descriptionsBtn = descSwitch.shadowRoot.querySelector('.switch-btn');


  /**
   * Just to have a function to toggle the
   * enabled/disabled state of the other
   * switches in the document.
   */
  const enableAll = function () {
    if ( settingsBtn.getAttribute('aria-checked') === 'true' ) {
      darkModeBtn.disabled = false;
      transitionsBtn.disabled = false;
      descriptionsBtn.disabled = false;
    }
    else {
      darkModeBtn.disabled = true;
      transitionsBtn.disabled = true;
      descriptionsBtn.disabled = true;
    }
  };

  settingsBtn.addEventListener('click', enableAll);



  /**
   * Don't want a flash of color changing on page load,
   * so add CSS transition after the fact via a timeout.
   *
   * Also check for if reduced motion is on.  Because if so,
   * then don't even add the transition.
   */
  const motionQuery = w.matchMedia('(prefers-reduced-motion)');
  const checkMotion = function () {
    if ( !motionQuery.matches ) {
      app.classList.add('transition');
      body.classList.add('transition');
    }
  };

  const removeTransitionClass = function () {
    if ( transitionsBtn.getAttribute('aria-checked') === 'true' ) {
      app.classList.remove('transition');
      body.classList.remove('transition');
    }
    else {
      checkMotion();
    }
  };

  setTimeout(function () {
    checkMotion();
  }, 10);

  transitionsBtn.addEventListener('click', removeTransitionClass);


  /**
   * Toggle the class on the body element based
   * on whether the darkModeInput switch is On (checked)
   * or not.  Run function on load to immediately set.
   */
  const setMode = function () {
    if ( darkModeBtn.getAttribute('aria-checked') === 'true' ) {
      body.classList.add('dark-mode');
    }
    else {
      body.classList.remove('dark-mode');
    }
  };

  setMode();
  darkModeBtn.addEventListener('click', setMode);



  /**
   * Show or hide the on/off knob labels
   */
  const labelKnobs = function () {
    if ( descriptionsBtn.getAttribute('aria-checked') === 'true' ) {
      settingsBtn.classList.add('switch-btn--show-labels');
      darkModeBtn.classList.add('switch-btn--show-labels');
      transitionsBtn.classList.add('switch-btn--show-labels');
      descriptionsBtn.classList.add('switch-btn--show-labels');
    }
    else {
      settingsBtn.classList.remove('switch-btn--show-labels');
      darkModeBtn.classList.remove('switch-btn--show-labels');
      transitionsBtn.classList.remove('switch-btn--show-labels');
      descriptionsBtn.classList.remove('switch-btn--show-labels');
    }
  };

  descriptionsBtn.addEventListener('click', labelKnobs);

})( document, window, undefined );

              
            
!
999px

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