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copied!<p>UPDATE: Google broke this. See the new accepted answer instead.</p> <p>The key, it turns out, is the document.webkitHidden property. When you set window.location to a custom URL scheme and it opens, the browser keeps running, but that property goes to false. So you can test it to determine whether the custom URL scheme was handled.</p> <p>Here's a sample, which you can <a href="https://s3.amazonaws.com/kaontest/productlink.html" rel="nofollow noreferrer">view live</a></p> <pre><code><html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title>Starting App...</title> <script> var URL = "kaonkaon://product.html#malvern;6"; var MARKET = "market://details?id=com.kaon.android.lepton.kaon3d"; var ITUNES = "itms://itunes.apple.com/us/app/kaon-interactive-3d-product/id525051513?mt=8&uo=4"; var QR = "http://goo.gl/gz07g"; // this should be a shortened link back to this page function onLoad() { if (navigator.userAgent.match(/Android/)) { if (navigator.userAgent.match(/Chrome/)) { // Jelly Bean with Chrome browser setTimeout(function() { if (!document.webkitHidden) window.location = MARKET; }, 1000); window.location = URL; } else { // Older Android browser var iframe = document.createElement("iframe"); iframe.style.border = "none"; iframe.style.width = "1px"; iframe.style.height = "1px"; var t = setTimeout(function() { window.location = MARKET; }, 1000); iframe.onload = function () { clearTimeout(t) }; iframe.src = URL; document.body.appendChild(iframe); } } else if (navigator.userAgent.match(/iPhone|iPad|iPod/)) { // IOS setTimeout(function() { if (!document.webkitHidden) window.location = ITUNES; }, 25); window.location = URL; } else { // Not mobile var img = document.createElement("img"); img.src = "https://chart.googleapis.com/chart?chs=300x300&cht=qr&chl="+encodeURIComponent(QR); document.body.appendChild(img); } } </script> </head> <body onload="onLoad()"> </body> </html> </code></pre>

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