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Had fun playing today...

Original

<a class="twitter-timeline" href="https://twitter.com/BoroughmuirHS" data-widget-id="">Tweets by @BoroughmuirHS</a>
<script>!function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0],p=/^http:/.test(d.location)?'http':'https';if(!d.getElementById(id)){js=d.createElement
(s);js.id=id;js.src=p+"://platform.twitter.com/widgets.js";fjs.parentNode.insertBefore(js,fjs);}}(document,"script","twitter-wjs");</script>

My description

<!-- this is an HTML link tag
don't understand the empty id attribute -->
<a class="twitter-timeline" href="https://twitter.com/BoroughmuirHS" data-widget-id="">Tweets by @BoroughmuirHS</a>

<script>
//I don't understand the NOT [!]
//I suspect that some cut-and-paste went wrong and that the interpreter will just junk it

//however this is a self-invocking anonymous function (often called a lambda)
//which is bad patter because there's nothing to input at runtime
//about the best I can say is that it doesn't put anything onto the namespace

!function(d,s,id){
//d is document a keyword
//s is 'script' a string
//id is 'twitter-wjs' a string
//notice that we could have just used, or assigned, these. We know them

//the next bit is a single line declaration
//which I'm going to split into 3 so that we can see what's going on

var js; //Just so it's there
//if you don't use var in an assignment it will still happen
//the nasty bit is that then you have silently created a global!!
//I have seen this cause horrid problems

var fjs=d.getElementsByTagName(s)[0]; //[1]
//what this wants to do is to get a reference to this script node/element
//node/element get a wee bit unclear when you are talking about javaScript and the DOM [Document Object Model]
//I use them interchangably, although I tend to use node if I have an actual reference to a live node
//it returns an live [reference to!] array of the nodes in document order
//the problem is what happens if this is not the first script node in the document?
//if the <a> above had a proper id then we could just use
//var toInsertBefore = document.getElementByID(<a>).nextSibling
//which could fail too but see below...

//right, the next bit is pure patter
//I know what it does but that's only because I looked at it hard
//I know that they are trying to keep their footprint small but this is too much
//what it wants to do is see if we are using vanilla http or if we are on https
//why it wants to do this is a wee bit of a mystery to me because they are a different site

//the best bit is that I don't think that it does what she thought it does -- whoops yes it does! My bad
//oh by the way hackers always refer to themselves as she

var p=/^http:/.test(d.location)?'http':'https';

//first off we have assignment by ternary operator, there are religious discussions about that!
//var x = booleanCondition ? xValueIfTrue : xValueIfFalse; is the pattern of assignment

//Then we have a regex literal -- /^http:/
//A literal is where we create an object without the new keyword
//A regex object has methods like match(string) or test(string)
//This is fairly normal in javaScript
//document.location will return a string like 'http://msdn.microsoft.com/en-gb/library/aa976858(v=vs.71).aspx'
//where you can learn about regexes
//the test() method of the regex object is invoked...
//If document.location starts with 'http:' then p will be 'http' else 'https'
//location always starts this way so we are all ok here
//unless...? Have to think about that one, can you trick a secure connection to someone else's session here?

if(!d.getElementById(id)){//if block starts
//the condition evalutes whether there an element with the id 'twitter-wjs' if there isn't we are going to create one
//this is very good practice, I've seen lots of scripts fail because a user has used more than one of them
//you can get away with having more than 1 element with the same ID but expect the wrong kind of fun...

//we create a vanilla <script> tag which we can play with
//this doesn't get inserted into the document until we say so
//You can take nodes out of a document, play with them and put them back somewhere else
//as you might expect there are security horrors here
js=d.createElement(s); //remember s == 'script' ie <script />

//We give it an id 'twitter-wjs' so that another script can't play along
//javascript is page single-threaded so we don't have to get creative
js.id=id; //remember id == 'twitter-wjs'
//we have <script id="twitter-wjs" />

//wait a cotton-picking...we can id a <script> tag, who knew? So why didn't we just do that at [1] above to get a //reference?

//now we use p, which is either 'http' or 'https' to give it an src attribute
//src will download a resource from the address string
//which means we will download another script from twitter
//something like 'http://platform.twitter.com/widgets.js' see below
js.src=p+"://platform.twitter.com/widgets.js";

//+ is a string concatenation here
//but + is very overloaded, you need to know what '5' + 5; or 5 + '5' actually does

//we have <script id="twitter-wjs" src="http://platform.twitter.com/widgets.js"/>

//now we insert our new <script /> element into document-flow just before?
fjs.parentNode.insertBefore(js,fjs);
//that's right. This script tag referenced by the variable fjs
//javascript doesn't have a native insertAfter(node, node) method
//every serious java scripter has one in her libray

}//end of if block

}//end of function
//now this bit invokes the function with the parameters
//which we knew, so why didn't we just use them inside the function?
(document,"script","twitter-wjs");
</script>

I suppose that this works but...

The script we are downloading? Something a bit trickier And uses eval [==evil] and JSON [==worry]

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{},a="",f,l=0,c=0,h=[];s=s||[],i=i||"",a=n(e,i,s);if(t[a])return t[a];o.className=i+" twitter-measurement";try{for(;f=s[l];l++)o.style[f[0]]=f[1]}catch(p)
{for(;f=s[c];c++)h.push(r(f[0])+":"+f[1]);o.setAttribute("style",h.join(";")+";")}return o.innerHTML=e,document.body.appendChild(o),u.width=o.clientWidth||
o.offsetWidth,u.height=o.clientHeight||o.offsetHeight,document.body.removeChild(o),o=null,t[a]=u})});
provide("tfw/widget/follow",function(e){using
("util/util","tfw/widget/base","util/querystring","util/uri","util/twitter","util/promise","dom/textsize",function(t,n,r,i,s,o,u){function a(e){if(!e)
return;var t,r,i,o;n.apply(this,[e]),t=this.params(),r=t.size||this.dataAttr("size"),i=t.showScreenName||this.dataAttr("show-screen-name"),o=t.count||
this.dataAttr("count"),this.classAttr.push("twitter-follow-button"),this.showScreenName=i!="false",this.showCount=t.showCount!==!1&&this.dataAttr("show-
count")!="false",o=="none"&&(this.showCount=!1),this.explicitWidth=t.width||this.dataAttr("width")||"",this.screenName=t.screen_name||t.screenName||
s.screenName(this.attr("href")),this.preview=t.preview||this.dataAttr("preview")||"",this.align=t.align||this.dataAttr
("align")||"",this.size=r=="large"?"l":"m"}a.prototype=new n,t.aug(a.prototype,{parameters:function(){var e=
{screen_name:this.screenName,lang:this.lang,show_count:this.showCount,show_screen_name:this.showScreenName,align:this.align,id:this.id,preview:this.preview,s
ize:this.size,partner:this.partner,dnt:this.dnt,_:+(new Date)};return t.compact(e),r.encode(e)},width:function(){if(this.calculatedWidth)return
this.calculatedWidth;if(this.explicitWidth)return this.explicitWidth;var e={cnt:13,btn:24,xlcnt:22,xlbtn:38},n=this.showScreenName?"Follow
%{screen_name}":"Follow",r=this._(n,{screen_name:"@"+this.screenName}),i=~t.indexOf(["ja","ko"],this.lang)?this._("10k unit"):this._("M"),s=this._
("%{followers_count} followers",{followers_count:"88888"+i}),o=0,a=0,f,l,c=this.styles.base;return this.size=="l"?(c=c.concat
(this.styles.large),f=e.xlbtn,l=e.xlcnt)f=e.btn,l=e.cnt),this.showCount&&(a=u(s,"",c).width+l),o=u(r,"",c.concat(this.styles.button)).width
+f,this.calculatedWidth=o+a},render:function(e,n){if(!this.screenName)return o.reject("Missing Screen Name").then(n);var r=twttr.widgets.config.assetUrl
()+"/widgets/follow_button.1409790579.html#"+this.parameters(),i=this.create(r,this.dimensions(),{title:this._("Twitter Follow Button")}).then(t.bind
(function(e){return this.element=e},this));return n&&i.then(n),i}}),e(a)})});
provide("tfw/widget/tweetbutton",function(e){using
("tfw/widget/base","tfw/util/globals","util/util","util/querystring","util/uri","util/twitter","util/typevalidator","dom/textsize",function(t,n,r,i,s,o,u,a)
{function p(e){t.apply(this,[e]);var i=this.params(),u=i.count||this.dataAttr("count"),a=i.size||this.dataAttr("size"),p=s.getScreenNameFromPage
(),d=""+(i.shareWithRetweet||this.dataAttr("share-with-retweet")||n.val("share-with-retweet"));this.classAttr.push("twitter-tweet-
button"),i.type=="hashtag"||~r.indexOf(this.classAttr,"twitter-hashtag-button")?(this.type="hashtag",this.classAttr.push("twitter-hashtag-
button")):i.type=="mention"||~r.indexOf(this.classAttr,"twitter-mention-button")?(this.type="mention",this.classAttr.push("twitter-mention-
button")):this.classAttr.push("twitter-share-button"),this.text=i.text||this.dataAttr("text"),this.text&&/\+/.test(this.text)&&!/ /.test(this.text)&&
(this.text=this.text.replace(/\+/g," ")),this.counturl=i.counturl||this.dataAttr("counturl"),this.searchlink=i.searchlink||this.dataAttr
("searchlink"),this.button_hashtag=o.hashTag(i.button_hashtag||i.hashtag||this.dataAttr("button-hashtag"),!
1),this.size=a=="large"?"l":"m",this.align=i.align||this.dataAttr("align")||"",this.via=i.via||this.dataAttr("via"),this.hashtags=i.hashtags||this.dataAttr
("hashtags"),this.screen_name=o.screenName(i.screen_name||i.screenName||this.dataAttr("button-screen-name")),this.url=i.url||this.dataAttr("url"),this.type?
(this.count="none",this.shareWithRetweet="never",p&&(this.related=this.related?p+","+this.related:p))this.text=this.text||f,this.url=this.url||
s.getCanonicalURL()||l,this.count=~r.indexOf(c,u)?u:"horizontal",this.count=this.count=="vertical"&&this.size=="l"?"none":this.count,this.via=this.via||
p,d&&~r.indexOf(h,d)&&(this.shareWithRetweet=d.replace("-","_")))}var f=document.title,l=encodeURI(location.href),c=["vertical","horizontal","none"],h=
[,"never","publisher-first","publisher-only","author-first","author-only"];p.prototype=new t,r.aug(p.prototype,{widgetUrlParams:function(){return r.compact
({text:this.text,url:this.url,via:this.via,related:this.related,count:this.count,lang:this.lang,counturl:this.counturl,searchlink:this.searchlink,placeid:thi
s.placeid,original_referer:location.href,id:this.id,size:this.size,type:this.type,screen_name:this.screen_name,share_with_retweet:this.shareWithRetweet,butto
n_hashtag:this.button_hashtag,hashtags:this.hashtags,align:this.align,partner:this.partner,dnt:this.dnt,_:+(new Date)})},parameters:function(){return
i.encode(this.widgetUrlParams())},height:function(){return this.count=="vertical"?62:this.size=="m"?20:28},width:function(){var e=
{ver:8,cnt:14,btn:24,xlcnt:18,xlbtn:38},t=this.count=="vertical",n=this.type=="hashtag"&&this.button_hashtag?"Tweet
%{hashtag}":this.type=="mention"&&this.screen_name?"Tweet to %{name}":"Tweet",i=this._(n,
{name:"@"+this.screen_name,hashtag:"#"+this.button_hashtag}),s=this._("K"),o=this._("100K+"),u=
(t?"8888":"88888")+s,f=0,l=0,c=0,h=0,p=this.styles.base,d=p;return~r.indexOf(["ja","ko"],this.lang)?u+=this._("10k unit"):u=u.length>o.length?u:o,t?
(d=p.concat(this.styles.vbubble),h=e.ver,c=e.btn):this.size=="l"?(p=d=p.concat(this.styles.large),c=e.xlbtn,h=e.xlcnt)c=e.btn,h=e.cnt),this.count!
="none"&&(l=a(u,"",d).width+h),f=a(i,"",p.concat(this.styles.button)).width+c,t?f>l?f:l:this.calculatedWidth=f+l},render:function(e,t){var
n=twttr.widgets.config.assetUrl()+"/widgets/tweet_button.1409790579.html#"+this.parameters(),i;return this.count&&this.classAttr.push("twitter-
count-"+this.count),i=this.create(n,this.dimensions(),{title:this._("Twitter Tweet Button")}).then(r.bind(function(e){return
this.element=e},this)),t&&i.then(t),i}}),e(p)})});
provide("tfw/factories",function(e){using
("util/util","util/promise","util/twitter","tfw/widget/base","tfw/widget/tweetbutton","tfw/widget/follow","tfw/widget/embed","tfw/widget/timeline",function
(t,n,r,i,s,o,u,a){function f(e,r,s,o){return e=e||[],s=s||{},function(){var u,a,f,l=Array.prototype.slice.apply(arguments,
[0,e.length]),c=Array.prototype.slice.apply(arguments,[e.length]),h;return t.forEach(c,function(e){if(!e)return;if(e.nodeType===1){f=e;return}if(t.isType
("function",e)){u=e;return}t.isType("object",e)&&(a=e)}),l.length!=e.length||c.length===0?(u&&t.async(function(){u(!1)}),n.reject("Not enough
parameters")):f?(a=t.aug(a||{},s),a.targetEl=f,t.forEach(e,function(e){a[e]=l.shift()}),h=new r(a),i.doLayout(),h.render(twttr.widgets.config),o&&o
(),u&&h.completed().then(u,function(){u(!1)}),h.completed())u&&t.async(function(){u(!1)}),n.reject("No target specified"))}}function l(e){var
n;e.linkColor=e.linkColor||e.previewParams.link_color,e.theme=e.theme||e.previewParams.theme,e.height=e.height||e.previewParams.height,n=new a
(e),this.render=t.bind(n.render,n),this.completed=t.bind(n.completed,n)}var c=f(["url"],s,{type:"share"}),h=f(["hashtag"],s,{type:"hashtag"}),p=f
(["screenName"],s,{type:"mention"}),d=f(["screenName"],o),v=f(["tweetId"],u,{},u.fetchAndRender),m=f(["widgetId"],a),g=f(["previewParams"],l),y=
{createShareButton:c,createMentionButton:p,createHashtagButton:h,createFollowButton:d,createTweet:v,createTweetEmbed:v,createTimeline:m};r.isTwitterURL
(window.location.href)&&(y.createTimelinePreview=g),e(y)})});
!function(){window.twttr=window.twttr||{},twttr.host=twttr.host||"platform.twitter.com",using("util/domready","util/env","util/logger",function(e,t,n)
{function r(e){return(e||!/^http\:$/.test(window.location.protocol))&&!twttr.ignoreSSL?"https":"http"}if(t.ie6())return;if
(twttr.widgets&&twttr.widgets.loaded)return twttr.widgets.load(),!1;if(twttr.init)return!1;twttr.init=!0,twttr._e=twttr._e||[],twttr.ready=twttr.ready||
function(e){twttr.widgets&&twttr.widgets.loaded?e(twttr):twttr._e.push(e)},using.path.length||(using.path=r()+"://"+twttr.host
+"/js"),twttr.ignoreSSL=twttr.ignoreSSL||!1;var i=[];twttr.events={bind:function(e,t){return i.push([e,t])}},e(function(){using
("tfw/widget/base","tfw/widget/follow","tfw/widget/tweetbutton","tfw/widget/embed","tfw/widget/timeline","tfw/widget/intent","tfw/factories","tfw/util/articl
e","util/events","util/util",function(e,t,s,o,u,a,f,l,c,h){function m(e){var t=twttr.host;return r(e)=="https"&&twttr.secureHost&&(t=twttr.secureHost),r
(e)+"://"+t}function g(){using("tfw/hub/client",function(e){twttr.events.hub=e.init(p),e.init(p,!0)})}var p={widgets:{"a.twitter-share-button":s,"a.twitter-
mention-button":s,"a.twitter-hashtag-button":s,"a.twitter-follow-button":t,"blockquote.twitter-tweet":o,"a.twitter-timeline":u,"div.twitter-
timeline":u,body:a}},d=twttr.events&&twttr.events.hub?twttr.events:{},v;p.assetUrl=m,twttr.widgets=twttr.widgets||{},h.aug(twttr.widgets,f,{config:
{assetUrl:m},load:function(t){n.time("load"),e.init(p),e.embed(t),twttr.widgets.loaded=!0}}),h.aug
(twttr.events,d,c.Emitter),v=twttr.events.bind,twttr.events.bind=function(e,t){g(),this.bind=v,this.bind(e,t)},h.forEach(i,function(e){twttr.events.bind(e
[0],e[1])}),h.forEach(twttr._e,function(e){h.async(function(){e(twttr)})}),twttr.ready=function(e){h.async(function(){e(twttr)})},twttr.widgets.load
()})})})}()});