Edit C:\Windows\WinStore\DemoFrame.htm

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta charset="UTF-8"/>
    <style id="cssStub"></style>
</head>

var wsOrigin = "ms-appx://winstore";
var wsFrame;
var OM;

function DemoHandleMessageFromNative(msgId, uParam, strParam) {
}

window.addEventListener("DOMContentLoaded", function () {

wsFrame = document.getElementById("wsFrame");
    OM = new WinStore.UI.OM(DemoHandleMessageFromNative);
    
    // Handle calls from local compartment
    window.addEventListener("message", function (e) {
        if (e.origin.toLowerCase() === wsOrigin) {
            if (e.data.method === "navigateAjax") {
                MSApp.execUnsafeLocalFunction(function() { wsFrame.innerHTML = e.data.html; });

// Load the CSS and js for the demo page dynamically
                var cssSrc = OM.imageUrlRoot + "\\Demo.css";
                OM.getFile(cssSrc, function (contents) { 
                    var cssStub = document.getElementById("cssStub");
                    if (cssStub) {
                        MSApp.execUnsafeLocalFunction(function() { cssStub.innerHTML = contents; });
                    }
                });
                
                var scriptSrc = OM.imageUrlRoot + "\\Demo.js";
                OM.getFile(scriptSrc, function (contents) { 
                    var scriptStub = document.getElementById("scriptStub");
                    if (scriptStub) {
                        MSApp.execUnsafeLocalFunction(function() { scriptStub.innerHTML = contents; });
                        onDemoContentLoaded();
                    }
                });
            }
        }
    }, false);

// Tell the local compartment that we're here
    top.postMessage({ method: "WS", event: "open" }, wsOrigin);

}, false);

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