Switch

DOM structure

<button class="switch">
  <div class="track">
    ::before
    <div class="handle">
      ::before
      <div class="icons">
      </div>
    </div>
  </div>
  <input type="checkbox" aria-hidden="true">
</button>

.switch

This is the outermost button. It holds the track and the input checkbox.

NOTE: This is intentionally left without a border to make the focus-ring simpler to apply.

.track

This is the track. It contains the track selected styles.

.track::before

This element contains the track unselected styles. Its opacity is set to 0 when the switch is selected.

.handle

This is the handle. It contains the styles of selected styles.

.handle::before

This element contains the handle unselected styles. Its opacity is set to 0 when the switch is selected.

Animations

• opacity on .track::before
  • Why? setting opacity will change between selected and unselected track
• opacity on .handle::before
  • Why? setting opacity will change between selected and unselected handle
• transform (scale) on .handle
  • Why? This animates the growing & shrinking of the handle.
• margin-inline-start & margin-inline-end on .handle
  • Why? This animates the position of the handle.