Allows for in-app navigation for add-to-home-screen capable web apps on iOS. Prevents links from opening in a new window on mobile Safari. Add this as the first script tag inside the head. Link to irae's gist: https://gist.github.com/irae/1042167

standalone-on-iOS.js

((document, navigator, standalone) => {
    'use strict';

    if ((standalone in navigator) && navigator[standalone]) {

        let currentNode, location = document.location, stop = /^(a|html)$/i;
        let onClickHandler = (event) => {

            currentNode = event.target;
            while (!(stop).test(currentNode.nodeName)) {
                currentNode = currentNode.parentNode;
            }

            if ('href' in currentNode
                && (currentNode.href.indexOf('http') || currentNode.href.indexOf(location.host))) {
                event.preventDefault();
                location.href = currentNode.href;                
            }
        };

        document.addEventListener('click', onClickHandler, false);
    }
    console.debug({'App': 'init'});

})(document, window.navigator, 'standalone');