material-design-lite/src/switch/snippets/switch-on.html

Material Design Components in CSS, JS and HTML

<label class="mdl-switch mdl-js-switch mdl-js-ripple-effect" for="switch-1">
  <input type="checkbox" id="switch-1" class="mdl-switch__input" checked>
  <span class="mdl-switch__label"></span>
</label>