https://www.odessar7.net/javascripts/polyfills/mobile-safari-link-fix-1.0.js

1'use strict';
2;(function(document,navigator,standalone) {
3  // prevents links from apps from oppening in mobile safari
4  // this javascript must be the first script in your <head>
5  if ((standalone in navigator) && navigator[standalone]) {
6    var curnode, location=document.location, stop=/^(a|html)$/i;
7    document.addEventListener('click', function(e) {
8      curnode=e.target;
9      while (!(stop).test(curnode.nodeName)) {
10        curnode=curnode.parentNode;
11      }
12      // Conditions to do this only on links to your own app
13      // if you want all links, use if('href' in curnode) instead.
14      if('href' in curnode && ( curnode.href.indexOf('http') || ~curnode.href.indexOf(location.host) ) ) {
15        e.preventDefault();
16        location.href = curnode.href;
17      }
18    },false);
19  }
20})(document,window.navigator,'standalone');