Troubleshoot iOS unsupported buttons: Methods for active pseudo-classes

The Mozilla Development Community has: the answer to active doesn't work:

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On a mobile device in an iOS system, you need to bind a Touchstart event on a button element or body/html to activate: the active state.

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With the above event listening code added, you can see the toggle effect on Safari Mobile After the button is pressed.

Troubleshoot iOS unsupported buttons: Methods for active pseudo-classes