html5 - Whats this long script in page source. What it is used for? -
the script below embedded in head section of html page below <meta> tags. can explain purpose of putting such long script in head section without content?
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r=f.createelement("script");r.src=p.proto+t.agent,e.parentnode.insertbefore(r,e)}}function r(){"complete"===f.readystate&&o()}function o(){a("mark",["domcontent",i()])}function i(){return(new date).gettime()}var a=t("handle"),s=t(1),c=(t(2),window),f=c.document,u=(""+location).split("?")[0],d={beacon:"bam.nr-data.net",errorbeacon:"bam.nr-data.net",agent:"js-agent.newrelic.com/nr-632.min.js"},p=e.exports={offset:i(),origin:u,features:{}};f.addeventlistener?(f.addeventlistener("domcontentloaded",o,!1),c.addeventlistener("load",n,!1)):(f.attachevent("onreadystatechange",r),c.attachevent("onload",n)),a("mark",["firstbyte",i()])},{1:23,2:14,handle:"d5dulp"}],loader:[function(t,e){e.exports=t("g9z0bl")},{}],23:[function(t,e){function n(t,e){var n=[],o="",i=0;for(o in t)r.call(t,o)&&(n[i]=e(o,t[o]),i+=1);return n}var r=object.prototype.hasownproperty;e.exports=n},{}],24:[function(t,e){function n(t,e,n){e||(e=0),"undefined"==typeof n&&(n=t?t.length:0);for(var r=-1,o=n-e||0,i=array(0>o?0:o);++r<o;)i[r]=t[e+r];return i}e.exports=n},{}],25:[function(t,e){function n(t){return!(t&&"function"==typeof t&&t.apply&&!t[i])}var r=t("ee"),o=t(1),i="nr@wrapper",a=object.prototype.hasownproperty;e.exports=function(t){function e(t,e,r,a){function nrwrapper(){var n,i,s,f;try{i=this,n=o(arguments),s=r&&r(n,i)||{}}catch(d){u([d,"",[n,i,a],s])}c(e+"start",[n,i,a],s);try{return f=t.apply(i,n)}catch(p){throw c(e+"err",[n,i,p],s),p}finally{c(e+"end",[n,i,f],s)}}return n(t)?t:(e||(e=""),nrwrapper[i]=!0,f(t,nrwrapper),nrwrapper)}function s(t,r,o,i){o||(o="");var a,s,c,f="-"===o.charat(0);for(c=0;c<r.length;c++)s=r[c],a=t[s],n(a)||(t[s]=e(a,f?s+o:o,i,s))}function c(e,n,r){try{t.emit(e,n,r)}catch(o){u([o,e,n,r])}}function f(t,e){if(object.defineproperty&&object.keys)try{var n=object.keys(t);return n.foreach(function(n){object.defineproperty(e,n,{get:function(){return t[n]},set:function(e){return t[n]=e,e}})}),e}catch(r){u([r])}for(var o in t)a.call(t,o)&&(e[o]=t[o]);return e}function u(e){try{t.emit("internal-error",e)}catch(n){}}return t||(t=r),e.inplace=s,e.flag=i,e}},{1:24,ee:"qjf3ax"}]},{},["g9z0bl",4,12,6,5]); </script> <script type="text/javascript"> if (top.location != self.location) top.location = self.location; </script>
this referred frame busting code. breaks framed document out top level.
top.location != self.location when current document not @ top level in window (e.g. it's in frame or iframe).
and, top.location = self.location; sets current url top level of window - breaking out of frame , moving top level of window.
this done sites want prevent being framed. can read more detailed description here.
modern browsers support newer means of preventing framing x-frame-options header. see description here.
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