Overcome the need to double-tap on a button with :hover:before or :hover:after on iOS

ios-double-tap.js

var styledLink = document.querySelectorAll('.button-link'),
    i;

for (i = 0; i < styledLink.length; ++i) {
  styledLink[i].addEventListener('touchend', function(e) {
    window.location = this.attr('href');
  })
}