What is nio.js? - javascript

What is nio.js? - javascript

I am seeing an unknown script being displayed on all pages hosted on my site. This was not added by me to any of the pages, so i am assuming the hosting company is adding it on the fly when a page is requested.
This is what is added to the the page
<script>
! function(n, e, i, o, t) {
'use strict';
if (!n.nio) {
n.nio = function() {
n.nio.execAction ? n.nio.execAction.apply(window.nio, arguments) : n.nio.queue.push(arguments)
}, n.nio.push = n.nio, n.nio.loaded = !0, n.nio.version = '1.0', n.nio.queue = [];
var s = e.createElement(i);
s.async = !0, s.src = o;
var r = e.getElementsByTagName(i)[0];
r.parentNode.insertBefore(s, r)
}
}(window, document, 'script', '//cdn.narrative.io/js/nio-js/v1.1/nio.js');
nio('init', 9);
</script>
<noscript><img height='1' width='1' style='display:none' src='https://io.narrative.io?noscript=1&id=9'/></noscript>
This is what the nio.js file contains.
! function(t, e, n, r, i) {
"use strict";
var o, a, u = "__nio";
if (!t.nio || 1 !== t.nio.libLoaded) {
var s = function() {
return "//" + r
},
c = function(t) {
var e = typeof t;
return "object" === e && "function" !== e && null !== t
};
o = "undefined" != typeof JSON && null !== JSON && JSON.stringify ? JSON.stringify : function() {
var t = Object.prototype.toString,
e = Array.isArray || function(e) {
return "[object Array]" === t.call(e)
},
n = {
'"': '\\"',
"\\": "\\\\",
"\b": "\\b",
"\f": "\\f",
"\n": "\\n",
"\r": "\\r",
" ": "\\t"
},
r = function(t) {
return n[t] || "\\u" + (t.charCodeAt(0) + 65536).toString(16).substr(1)
},
i = /[\\"\u0000-\u001F\u2028\u2029]/g;
return function o(n) {
if (null == n) return "null";
if ("number" == typeof n) return isFinite(n) ? n.toString() : "null";
if ("boolean" == typeof n) return n.toString();
if ("object" == typeof n) {
if ("function" == typeof n.toJSON) return o(n.toJSON());
if (e(n)) {
for (var a = "[", u = 0; u < n.length; u++) a += (u ? ", " : "") + o(n[u]);
return a + "]"
}
if ("[object Object]" === t.call(n)) {
var s = [];
for (var c in n) n.hasOwnProperty(c) && s.push(o(c) + ": " + o(n[c]));
return "{" + s.join(", ") + "}"
}
}
return '"' + n.toString().replace(i, r) + '"'
}
}();
var f = Object.assign || function(t) {
if (t === i || null === t) throw new TypeError("Cannot convert undefined or null to object");
for (var e = Object(t), n = 1; n < arguments.length; n++) {
var r = arguments[n];
if (r !== i && null !== r)
for (var o in r) r.hasOwnProperty(o) && (e[o] = r[o])
}
return e
},
l = function(t) {
var e, n = [];
for (var r in t) t.hasOwnProperty(r) && (e = c(t[r]) ? o(t[r]) : t[r], n.push(encodeURIComponent(r) + "=" + encodeURIComponent(e)));
return n.join("&")
},
p = "addEventListener" in e,
h = p ? "addEventListener" : "attachEvent",
d = p ? "removeEventListener" : "detachEvent",
m = function(t, e, n) {
e = p ? e : "on" + e;
var r = function(i) {
t[d](e, r, !1), n(i)
};
t[h](e, r, !1)
},
v = {
_isFiring: !1,
numOfRequests: 0,
addQueue: function(t) {
this.queue = this.queue.concat(t)
},
queue: [],
isEmpty: function() {
return 0 === this.queue.length
},
complete: function(t) {
return t || this.queue.shift(), this._isFiring = !1, this._fire()
},
_fire: function() {
if (0 !== this.queue.length) {
var t = this.queue[0],
e = t[0] + "?" + l(t[1]);
return this._isFiring = !0, this.numOfRequests++, e.length > 2048 ? this.fireForm(t[0], t[1]) : this.fireImage(e)
}
},
request: function() {
return this.queue.push(Array.prototype.slice.call(arguments)), this._isFiring ? this._isFiring : this._fire()
},
fireForm: function(t, n) {
var r = this,
i = "nio" + Math.random().toString().replace("0.", ""),
a = e.createElement("form"),
u = e.attachEvent && !e.addEventListener,
s = u ? '<iframe name="' + i + '">' : "iframe",
f = e.createElement(s);
a.method = "post", a.action = t, a.target = i, a.acceptCharset = "utf-8", a.style.display = "none", f.src = "javascript:false", f.id = i, f.name = i, a.appendChild(f), m(f, "load", function() {
var t, i = function(t) {
var e = c(t) ? t.type : null;
return a.parentNode.removeChild(a), r.complete("load" !== e)
};
for (var u in n) n.hasOwnProperty(u) && (t = e.createElement("input"), t.name = u, t.value = c(n[u]) ? o(n[u]) : n[u], a.appendChild(t));
m(f, "load", i), m(f, "error", i), a.submit()
}), e.body.appendChild(a)
},
fireImage: function(t) {
var e = new Image,
n = this,
r = function() {
n.complete()
};
return e.onload = r, e.onerror = r, e.src = t, t
}
},
g = {
companyId: null,
options: {
forceSSL: !1,
forcePost: !1
},
getStandardVars: function() {
return {
companyId: this.companyId,
ret: "img",
ts: (new Date).valueOf()
}
},
errors: [],
error: function(t) {
this.errors.push(t)
},
init: function(t, e) {
this.companyId = t, this.config(e)
},
config: function(t) {
for (var e in t) t.hasOwnProperty(e) && (this.options[e] === i && g.error("Narrative.io: " + e + " is not a valid config option"), this.options[e] = t[e])
},
data: function(t) {
return this.submit(t)
},
submit: function(t) {
var e = s();
e = (this.options.forceSSL ? "https:" : n.protocol) + e;
var r = f({}, this.getStandardVars(), t);
return v.request(e, r)
}
};
t.nio._debug = function() {
return [g, v, a]
}, t.nio.execAction = function(t) {
var e = Array.prototype.slice.call(arguments).slice(1);
switch (t) {
case "init":
return g.init.apply(g, e);
case "data":
return g.data.apply(g, e);
default:
return g.error("Narrative.io: " + t + " is not a valid action")
}
}, t.nio.libLoaded = !0, t.nio.libVersion = "1.0", t.nio.isValid = function() {
return 0 === g.errors.length
};
for (var y = t.nio.queue.slice(), S = 0; S < y.length; S++) t.nio.execAction.apply(t.nio, y[S]);
if (y.length = 0, a = null, t.sessionStorage) {
a = function() {
!v.isEmpty() && c(JSON) && "function" == typeof JSON.parse && t.sessionStorage.setItem(u, o(v.queue))
}, m(t, "beforeunload", a, !1);
var b = t.sessionStorage.getItem(u);
if (null !== b) try {
b = JSON.parse(b), v.addQueue(b)
} catch (O) {
g.error("Narrative.io: " + O.message)
} finally {
t.sessionStorage.removeItem(u)
}
}
setTimeout(function(t, e) {
return function() {
0 === e.numOfRequests && t.execAction("data")
}
}(t.nio, v), 250)
}
}(window, document, location, "io.narrative.io");
I am trying to understand what this script intends to do. Google search did not yield any useful information, and the company hosting the js file does not have much information on it. Hoping to get some javascript expert make sense of this.

This was resolved. The hosting company did some more digging and found out from their development team that this was part of a pilot program to collect some analytics data.

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In this code, I initialize everything using the snippet provided in the link above. I try to call x.hello, but x isn't defined so any exception is thrown. I then attempt to log that exception manually using appInsights.trackException(ex) and I also re-throw the exception because, according to the link above, unhandled browser exceptions should be logged automatically. I am however not seeing either of these events appear in application insights.
I know my instrumentation key is correct, because an incorrect one would yield some 400 errors when attempting to connect. This is what my network tab looks like after connecting.
Any ideas where I'm going wrong here?

I am following the same snippet which you are used.
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<script type="text/javascript">
!function (T, l, y) { var S = T.location, k = "script", D = "instrumentationKey", C = "ingestionendpoint", I = "disableExceptionTracking", E = "ai.device.", b = "toLowerCase", w = "crossOrigin", N = "POST", e = "appInsightsSDK", t = y.name || "appInsights"; (y.name || T[e]) && (T[e] = t); var n = T[t] || function (d) { var g = !1, f = !1, m = { initialize: !0, queue: [], sv: "5", version: 2, config: d }; function v(e, t) { var n = {}, a = "Browser"; return n[E + "id"] = a[b](), n[E + "type"] = a, n["ai.operation.name"] = S && S.pathname || "_unknown_", n["ai.internal.sdkVersion"] = "javascript:snippet_" + (m.sv || m.version), { time: function () { var e = new Date; function t(e) { var t = "" + e; return 1 === t.length && (t = "0" + t), t } return e.getUTCFullYear() + "-" + t(1 + e.getUTCMonth()) + "-" + t(e.getUTCDate()) + "T" + t(e.getUTCHours()) + ":" + t(e.getUTCMinutes()) + ":" + t(e.getUTCSeconds()) + "." + ((e.getUTCMilliseconds() / 1e3).toFixed(3) + "").slice(2, 5) + "Z" }(), iKey: e, name: "Microsoft.ApplicationInsights." + e.replace(/-/g, "") + "." + t, sampleRate: 100, tags: n, data: { baseData: { ver: 2 } } } } var h = d.url || y.src; if (h) { function a(e) { var t, n, a, i, r, o, s, c, u, p, l; g = !0, m.queue = [], f || (f = !0, t = h, s = function () { var e = {}, t = d.connectionString; if (t) for (var n = t.split(";"), a = 0; a < n.length; a++) { var i = n[a].split("="); 2 === i.length && (e[i[0][b]()] = i[1]) } if (!e[C]) { var r = e.endpointsuffix, o = r ? e.location : null; e[C] = "https://" + (o ? o + "." : "") + "dc." + (r || "services.visualstudio.com") } return e }(), c = s[D] || d[D] || "", u = s[C], p = u ? u + "/v2/track" : d.endpointUrl, (l = []).push((n = "SDK LOAD Failure: Failed to load Application Insights SDK script (See stack for details)", a = t, i = p, (o = (r = v(c, "Exception")).data).baseType = "ExceptionData", o.baseData.exceptions = [{ typeName: "SDKLoadFailed", message: n.replace(/\./g, "-"), hasFullStack: !1, stack: n + "\nSnippet failed to load [" + a + "] -- Telemetry is disabled\nHelp Link: https://go.microsoft.com/fwlink/?linkid=2128109\nHost: " + (S && S.pathname || "_unknown_") + "\nEndpoint: " + i, parsedStack: [] }], r)), l.push(function (e, t, n, a) { var i = v(c, "Message"), r = i.data; r.baseType = "MessageData"; var o = r.baseData; return o.message = 'AI (Internal): 99 message:"' + ("SDK LOAD Failure: Failed to load Application Insights SDK script (See stack for details) (" + n + ")").replace(/\"/g, "") + '"', o.properties = { endpoint: a }, i }(0, 0, t, p)), function (e, t) { if (JSON) { var n = T.fetch; if (n && !y.useXhr) n(t, { method: N, body: JSON.stringify(e), mode: "cors" }); else if (XMLHttpRequest) { var a = new XMLHttpRequest; a.open(N, t), a.setRequestHeader("Content-type", "application/json"), a.send(JSON.stringify(e)) } } }(l, p)) } function i(e, t) { f || setTimeout(function () { !t && m.core || a() }, 500) } var e = function () { var n = l.createElement(k); n.src = h; var e = y[w]; return !e && "" !== e || "undefined" == n[w] || (n[w] = e), n.onload = i, n.onerror = a, n.onreadystatechange = function (e, t) { "loaded" !== n.readyState && "complete" !== n.readyState || i(0, t) }, n }(); y.ld < 0 ? l.getElementsByTagName("head")[0].appendChild(e) : setTimeout(function () { l.getElementsByTagName(k)[0].parentNode.appendChild(e) }, y.ld || 0) } try { m.cookie = l.cookie } catch (p) { } function t(e) { for (; e.length;)!function (t) { m[t] = function () { var e = arguments; g || m.queue.push(function () { m[t].apply(m, e) }) } }(e.pop()) } var n = "track", r = "TrackPage", o = "TrackEvent"; t([n + "Event", n + "PageView", n + "Exception", n + "Trace", n + "DependencyData", n + "Metric", n + "PageViewPerformance", "start" + r, "stop" + r, "start" + o, "stop" + o, "addTelemetryInitializer", "setAuthenticatedUserContext", "clearAuthenticatedUserContext", "flush"]), m.SeverityLevel = { Verbose: 0, Information: 1, Warning: 2, Error: 3, Critical: 4 }; var s = (d.extensionConfig || {}).ApplicationInsightsAnalytics || {}; if (!0 !== d[I] && !0 !== s[I]) { var c = "onerror"; t(["_" + c]); var u = T[c]; T[c] = function (e, t, n, a, i) { var r = u && u(e, t, n, a, i); return !0 !== r && m["_" + c]({ message: e, url: t, lineNumber: n, columnNumber: a, error: i }), r }, d.autoExceptionInstrumented = !0 } return m }(y.cfg); function a() { y.onInit && y.onInit(n) } (T[t] = n).queue && 0 === n.queue.length ? (n.queue.push(a), n.trackPageView({})) : a() }(window, document, {
src: "https://js.monitor.azure.com/scripts/b/ai.2.min.js", // The SDK URL Source
// name: "appInsights", // Global SDK Instance name defaults to "appInsights" when not supplied
// ld: 0, // Defines the load delay (in ms) before attempting to load the sdk. -1 = block page load and add to head. (default) = 0ms load after timeout,
// useXhr: 1, // Use XHR instead of fetch to report failures (if available),
crossOrigin: "anonymous", // When supplied this will add the provided value as the cross origin attribute on the script tag
// onInit: null, // Once the application insights instance has loaded and initialized this callback function will be called with 1 argument -- the sdk instance (DO NOT ADD anything to the sdk.queue -- As they won't get called)
cfg: { // Application Insights Configuration
instrumentationKey: "Your Instrumentation key"
/* ...Other Configuration Options... */
}
});
</script>
<script>
//function getCookieValue(key) {
// const cookie = document.cookie
// .split('; ')
// .find(cookie => cookie.startsWith(key));
// return cookie ? cookie.split('=')[1] : null;
//}
//var telemetryInitializer = (envelope) => {
// const environment = getCookieValue('x-ms-routing-name') || 'production';
// envelope.data['slot'] = environment;
//}
//appInsights.addTelemetryInitializer(telemetryInitializer);
console.log(appInsights); // this produces an output, so appInsights is at least created
try {
s.hello; // x is not defined, this throws an exception
} catch (ex) {
//appInsights.trackException(ex); // attempting to log exception manually
appInsights.flush();
throw ex; // attempting to log unhandled exception
}
</script>
</head>
Without adding the appInsights.trackException(ex); I am able to see the uncaught ReferenceError in application insights.
Refer here for more info

Redirect on JQuery between other functions

How do I redirect to any page after the script below got sucess?
Something like: If the code below did everything right, I need to go to the thanks page. Please help me. Thanks
jQuery(function(t) {
var e = function() {
var e = ("https:" == location.protocol ? "https:" : "http:") + "//formoid.net/api/push",
a = function() {
var e = (/MSIE (\d+)\./.exec(navigator.userAgent) || [0, 0])[1]
return 8 == e || 9 == e && "file:" != location.protocol ? function(e, a) {
var n = new XDomainRequest,
r = t.Deferred()
return n.open(a.type, e), n.onload = function() {
r.resolve(this.responseText)
}, n.onerror = function() {
r.reject()
}, n.send(a.data), r
} : (t.support.cors = !0, t.ajax)
}(),
n = function(t, e) {
return t = "__" + t + "__", e.length ? (this[t] = e[0], this) : this[t]
},
r = function(e, a, n) {
return t.each(n, function(t, n) {
e[n] = function() {
return a[n].apply(a, arguments)
}
}), e
},
i = function(t) {
t = t || {}, this.__email__ = t.email || "", this.__title__ = t.title || "", this.__data__ = t.data || []
}
return i.prototype.email = function(t) {
return n.call(this, "email", arguments)
}, i.prototype.title = function(t) {
return n.call(this, "title", arguments)
}, i.prototype.data = function(t) {
return n.call(this, "data", arguments)
}, i.prototype.send = function(n, i) {
var o = r(t.Deferred(), this, ["email", "title", "data", "send"])
return i && (i.call(this, o), "pending" != o.state()) ? o : (a(e, {
type: "POST",
data: JSON.stringify({
email: this.__email__,
form: {
title: this.__title__,
data: arguments.length ? n : this.__data__
}
})
}).done(function(t) {
try {
var e = JSON.parse(t)
e.error ? o.reject(e.error) : o.resolve(e.response)
} catch (a) {
o.reject("Incorrect server response.")
}
}).fail(function() {
var t = "Failed to query the server. "
t += "onLine" in navigator && !navigator.onLine ? "No connection to the Internet." : "Check the connection and try again.", o.reject(t)
}), o)
}, {
Form: function(t) {
return new i(t)
}
}
}(),
a = function(e) {
if (e.checkValidity) return e.checkValidity()
var a = !0,
n = t(e).val(),
r = t(e).attr("type")
return n ? a = !("email" === r && !/^([^#]+?)#(([a-z0-9]-*)*[a-z0-9]+\.)+([a-z0-9]+)$/i.test(n)) : t(e).attr("required") && (a = !1), t(e)[(a ? "remove" : "add") + "Class"]("form-invalid"), a
}
t('[data-form-type="formoid"]').each(function() {
var n, r = t(this),
i = r.is("form") ? r : r.find("form"),
o = r.find("[data-form-alert]"),
s = r.is("[data-form-title]") ? r : r.find("[data-form-title]"),
l = r.find('[type="submit"]'),
c = o.attr("data-success") || o.find("[data-form-alert-success]").html()
l.html('<span class="btn-text">' + l.html() + '</span><i class="btn-loader"></i>').click(function() {
i.addClass("form-active")
}), i.submit(function(d) {
if (d.preventDefault(), i.addClass("form-active"), !l.hasClass("btn-loading")) {
var f = !0,
u = []
n = n || e.Form({
email: r.find("[data-form-email]").val(),
title: s.attr("data-form-title") || s.text()
}), o.html(""), r.find("[data-form-field]").each(function() {
a(this) || (f = !1), u.push([t(this).attr("data-form-field") || t(this).attr("name"), t(this).val()])
}), f && (l.addClass("btn-loading").prop("disabled", !0), n.send(u).done(function(e) {
i.removeClass("form-active"), r.find("[data-form-field]").val(""), o.append(t('<div class="alert alert-form alert-success text-xs-center"/>').text(c || e))
}).fail(function(e) {
o.append(t('<div class="alert alert-form alert-danger text-xs-center"/>').text(e))
}).always(function() {
l.removeClass("btn-loading").prop("disabled", !1)
}))
}
})
})
})
Everything works fine but in the end I want to redirect to a page right after the form data has been sent. Can you help me? Thanks

Bind an event to the submit of the form, if you have one, or run a callback after a successful response comes back from the server and use window.location to send the user to your desired URL. More information on window.location can be found here: https://developer.mozilla.org/en-US/docs/Web/API/Window/location. (Look at the example #1)
I can't say more than that from the code you shared.

Determining saftey of Javascript from other authors, with example

I would like to know what kind of safety measurements do you take into consideration when importing javascript code from another author (stated free to use) into your project.
So if you came across a super simple navigation template from codepen, after I d/l it I found out it didn't work unless it uses a js file that contained an XMLHttpRequest (why would you need an http request for this template, I don't know) here's another example with a lot of var declarations and replaces.
So to reiterate my question, other than seeing if this following code is dodgy, I would also like to know why would you need an http request for a simple website like this and what measurement would you take when you use other people's code, or maybe you never use other people code?
!function () {
function e(e, r) {
return [].slice.call((r || document).querySelectorAll(e))
}
if (window.addEventListener) {
var r = window.StyleFix = {
link: function (e) {
try {
if ("stylesheet" !== e.rel || e.hasAttribute("data-noprefix"))return
} catch (t) {
return
}
var n, i = e.href || e.getAttribute("data-href"),
a = i.replace(/[^\/]+$/, ""), o = (/^[a-z]{3,10}:/.exec(a) || [""])[0],
s = (/^[a-z]{3,10}:\/\/[^\/]+/.exec(a) || [""])[0], l = /^([^?]*)\??/.exec(i)[1], u = e.parentNode, p = new XMLHttpRequest;
p.onreadystatechange = function () {
4 === p.readyState && n()
}, n = function () {
var t = p.responseText;
if (t && e.parentNode && (!p.status || p.status < 400 || p.status > 600)) {
if (t = r.fix(t, !0, e), a) {
t = t.replace(/url\(\s*?((?:"|')?)(.+?)\1\s*?\)/gi, function (e, r, t) {
return /^([a-z]{3,10}:|#)/i.test(t) ? e : /^\/\//.test(t) ? 'url("' + o + t + '")' : /^\//.test(t) ? 'url("' + s + t + '")' : /^\?/.test(t) ? 'url("' + l + t + '")' : 'url("' + a + t + '")'
});
var n = a.replace(/([\\\^\$*+[\]?{}.=!:(|)])/g, "\\$1");
t = t.replace(RegExp("\\b(behavior:\\s*?url\\('?\"?)" + n, "gi"), "$1")
}
var i = document.createElement("style");
i.textContent = t, i.media = e.media, i.disabled = e.disabled, i.setAttribute("data-href", e.getAttribute("href")), u.insertBefore(i, e), u.removeChild(e), i.media = e.media
}
};
try {
p.open("GET", i), p.send(null)
} catch (t) {
"undefined" != typeof XDomainRequest && (p = new XDomainRequest, p.onerror = p.onprogress = function () {
}, p.onload = n, p.open("GET", i), p.send(null))
}
e.setAttribute("data-inprogress", "")
}, styleElement: function (e) {
if (!e.hasAttribute("data-noprefix")) {
var t = e.disabled;
e.textContent = r.fix(e.textContent, !0, e), e.disabled = t
}
}, styleAttribute: function (e) {
var t = e.getAttribute("style");
t = r.fix(t, !1, e), e.setAttribute("style", t)
}, process: function () {
e("style").forEach(StyleFix.styleElement), e("[style]").forEach(StyleFix.styleAttribute)
}, register: function (e, t) {
(r.fixers = r.fixers || []).splice(void 0 === t ? r.fixers.length : t, 0, e)
}, fix: function (e, t, n) {
for (var i = 0; i < r.fixers.length; i++)e = r.fixers[i](e, t, n) || e;
return e
}, camelCase: function (e) {
return e.replace(/-([a-z])/g, function (e, r) {
return r.toUpperCase()
}).replace("-", "")
}, deCamelCase: function (e) {
return e.replace(/[A-Z]/g, function (e) {
return "-" + e.toLowerCase()
})
}
};
!function () {
setTimeout(function () {
}, 10), document.addEventListener("DOMContentLoaded", StyleFix.process, !1)
}()
}
}(), function (e) {
function r(e, r, n, i, a) {
if (e = t[e], e.length) {
var o = RegExp(r + "(" + e.join("|") + ")" + n, "gi");
a = a.replace(o, i)
}
return a
}
if (window.StyleFix && window.getComputedStyle) {
var t = window.PrefixFree = {
prefixCSS: function (e, n) {
var i = t.prefix;
if (t.functions.indexOf("linear-gradient") > -1 && (e = e.replace(/(\s|:|,)(repeating-)?linear-gradient\(\s*(-?\d*\.?\d*)deg/gi, function (e, r, t, n) {
return r + (t || "") + "linear-gradient(" + (90 - n) + "deg"
})), e = r("functions", "(\\s|:|,)", "\\s*\\(", "$1" + i + "$2(", e), e = r("keywords", "(\\s|:)", "(\\s|;|\\}|$)", "$1" + i + "$2$3", e), e = r("properties", "(^|\\{|\\s|;)", "\\s*:", "$1" + i + "$2:", e), t.properties.length) {
var a = RegExp("\\b(" + t.properties.join("|") + ")(?!:)", "gi");
e = r("valueProperties", "\\b", ":(.+?);", function (e) {
return e.replace(a, i + "$1")
}, e)
}
return n && (e = r("selectors", "", "\\b", t.prefixSelector, e), e = r("atrules", "#", "\\b", "#" + i + "$1", e)), e = e.replace(RegExp("-" + i, "g"), "-"), e = e.replace(/-\*-(?=[a-z]+)/gi, t.prefix)
}, property: function (e) {
return (t.properties.indexOf(e) ? t.prefix : "") + e
}, value: function (e) {
return e = r("functions", "(^|\\s|,)", "\\s*\\(", "$1" + t.prefix + "$2(", e), e = r("keywords", "(^|\\s)", "(\\s|$)", "$1" + t.prefix + "$2$3", e)
}, prefixSelector: function (e) {
return e.replace(/^:{1,2}/, function (e) {
return e + t.prefix
})
}, prefixProperty: function (e, r) {
var n = t.prefix + e;
return r ? StyleFix.camelCase(n) : n
}
};
!function () {
var e = {}, r = [], n = getComputedStyle(document.documentElement, null), i = document.createElement("div").style, a = function (t) {
if ("-" === t.charAt(0)) {
r.push(t);
var n = t.split("-"), i = n[1];
for (e[i] = ++e[i] || 1; n.length > 3;) {
n.pop();
var a = n.join("-");
o(a) && -1 === r.indexOf(a) && r.push(a)
}
}
}, o = function (e) {
return StyleFix.camelCase(e) in i
};
if (n.length > 0)for (var s = 0; s < n.length; s++)a(n[s]); else for (var l in n)a(StyleFix.deCamelCase(l));
var u = {uses: 0};
for (var p in e) {
var f = e[p];
u.uses < f && (u = {prefix: p, uses: f})
}
t.prefix = "-" + u.prefix + "-", t.Prefix = StyleFix.camelCase(t.prefix), t.properties = [];
for (var s = 0; s < r.length; s++) {
var l = r[s];
if (0 === l.indexOf(t.prefix)) {
var c = l.slice(t.prefix.length);
o(c) || t.properties.push(c)
}
}
"Ms" != t.Prefix || "transform" in i || "MsTransform" in i || !("msTransform" in i) || t.properties.push("transform", "transform-origin"), t.properties.sort()
}(), function () {
function e(e, r) {
return i[r] = "", i[r] = e, !!i[r]
}
var r = {
"linear-gradient": {property: "backgroundImage", params: "red, teal"},
calc: {property: "width", params: "1px + 5%"},
element: {property: "backgroundImage", params: "#foo"},
"cross-fade": {property: "backgroundImage", params: "url(a.png), url(b.png), 50%"}
};
r["repeating-linear-gradient"] = r["repeating-radial-gradient"] = r["radial-gradient"] = r["linear-gradient"];
var n = {
initial: "color",
"zoom-in": "cursor",
"zoom-out": "cursor",
box: "display",
flexbox: "display",
"inline-flexbox": "display",
flex: "display",
"inline-flex": "display",
grid: "display",
"inline-grid": "display",
"min-content": "width"
};
t.functions = [], t.keywords = [];
var i = document.createElement("div").style;
for (var a in r) {
var o = r[a], s = o.property, l = a + "(" + o.params + ")";
!e(l, s) && e(t.prefix + l, s) && t.functions.push(a)
}
for (var u in n) {
var s = n[u];
!e(u, s) && e(t.prefix + u, s) && t.keywords.push(u)
}
}(), function () {
function r(e) {
return a.textContent = e + "{}", !!a.sheet.cssRules.length
}
var n = {
":read-only": null,
":read-write": null,
":any-link": null,
"::selection": null
}, i = {keyframes: "name", viewport: null, document: 'regexp(".")'};
t.selectors = [], t.atrules = [];
var a = e.appendChild(document.createElement("style"));
for (var o in n) {
var s = o + (n[o] ? "(" + n[o] + ")" : "");
!r(s) && r(t.prefixSelector(s)) && t.selectors.push(o)
}
for (var l in i) {
var s = l + " " + (i[l] || "");
!r("#" + s) && r("#" + t.prefix + s) && t.atrules.push(l)
}
e.removeChild(a)
}(), t.valueProperties = ["transition", "transition-property"], e.className += " " + t.prefix, StyleFix.register(t.prefixCSS)
}
}(document.documentElement);
Here is the code.

why would you need an http request for a simple website like this
You don't. The effect on the page is done entirely with CSS. You can delete all the JS and it still works.
The JavaScript is a minified (which is why it's so hard to read) version of this library, which is a complicated and brittle attempt to adapt CSS styles for older browsers that require browser-specific property prefixes for some of the newer CSS features. It has to do XMLHttpRequests in order to fetch the stylesheet files and fiddle with them.
It's unclear why the example code has bothered use that library, since the CSS already contains the prefixed versions of the properties. But that's the joy and curse of grabbing random code off the internet, you have no idea if it's at all sensible...
I would like to know what kind of safety measurements do you take into consideration when importing javascript code from another author (stated free to use) into your project.
There's no magic bullet. You have to read and understand what all the code is doing, or you have to completely trust the author of the code (and the operators of the service hosting it, if you're linking it directly from a third-party server like a CDN).

Why doesn't Twitter's follow button widget remember me?

I follow people. I go to check out their sites. Many have a 'follow' button with counter like this one
but if I am I am already following this person the button should be 'grayed' out like this all the time
but once you refresh the page or return at a later time it looks like I am not a follower. Instead, you need to click the 'follow' button on the site, then twitter's dialog box comes up only to tell me that I am already 'following'
and when you mouse over this button it says 'unfollow' in red.
Do does twitter have some sort of Follower.Event.Subscribe function that can recognise people when they are on a site that they 'follow.' If they can recognize follow numbers on a site so why not remember followers?

It come's down Cookies. If the token is not in your browser history how would twitter know that you have clicked it?
What you might find that if you sign into twitter first and then go to the sites and hit refresh it will change to following.
Also if you like me have a tiny Cache for your browser that kills everything on refresh or close then it will definitely not stand a chance at remembering you because your killing the cookie instantly.
UPDATE
It would seem twitter have changed how the use the follow buttons now.
Before if I was logged into twitter and I pressed follow it would just follow them but now I see a gateway popup with a stream etc.
What seems to have happened is Twitter have stopped cookie dropping and opted for a gateway api.
As for the button the key is in the following code:
! function() {
Function && Function.prototype && Function.prototype.bind && (/MSIE [678]/.test(navigator.userAgent) || ! function t(e, n, r) {
function i(s, a) {
if (!n[s]) {
if (!e[s]) {
var u = "function" == typeof require && require;
if (!a && u) return u(s, !0);
if (o) return o(s, !0);
var c = new Error("Cannot find module '" + s + "'");
throw c.code = "MODULE_NOT_FOUND", c
}
var f = n[s] = {
exports: {}
};
e[s][0].call(f.exports, function(t) {
var n = e[s][1][t];
return i(n ? n : t)
}, f, f.exports, t, e, n, r)
}
return n[s].exports
}
for (var o = "function" == typeof require && require, s = 0; s < r.length; s++) i(r[s]);
return i
}({
1: [
function(t, e, n) {
(function() {
"use strict";
function t(t) {
return "function" == typeof t || "object" == typeof t && null !== t
}
function n(t) {
return "function" == typeof t
}
function r(t) {
return "object" == typeof t && null !== t
}
function i() {}
function o() {
return function() {
process.nextTick(c)
}
}
function s() {
var t = 0,
e = new F(c),
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function y(t) {
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function _(t, e) {
t._state === H && (t._result = e, t._state = B, 0 === t._subscribers.length || A(x, t))
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function b(t, e) {
t._state === H && (t._state = z, t._result = e, A(y, t))
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function x(t) {
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function I() {
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function S(t) {
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D = "undefined" != typeof Uint8ClampedArray && "undefined" != typeof importScripts && "undefined" != typeof MessageChannel,
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tt = {
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return E ? void(C.title = _("View your profile on Twitter")) : t ? (i(O, "following"), void(C.title = _("You are following %{name} on Twitter", {
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What seem's to be going on here is a handshake with twitters secure server.
So that your information is encrypted.
and all that's happening if the handshake is initiated is that JS is graying out the button.
At no point is this api interacting with the website directly hence why you are not seeing a grayed out button when you are revisiting the site.
It's actually a good think it means that twitter is protecting your privacy as a user.
It also shows that twitter have decided to go down the do not track route for website's so they aren't scoping out a lot of user info.
Sorry about the wait on my answer and the lengthy comment's this must of only happened in recent month's because my last experience with Twitter buttons they had cookie drop's and didnt gateway you like it does now.

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