Do you know how to examine all the source files so you can see for yourself? (Although, to be sure, “real” web sites are often horrendously convoluted, often being auto-generated by page-builder software.)
You can generally look at the HTML source with “View Source” of course. But did you know that you can also view the CSS and the JavaScript? (Hey, I only just discovered that recently myself.) At least in Firefox you can. Open the View Source window, and click on any of the CSS or JS file names there, and you can view those files.
The CSS files are typically easy to read.
The JS files are typically NOT easy to read. They are often iceballed, looking like this:
(function(a,b){function ci(a){return d.isWindow(a)?a:a.nodeType===9?a.defaultView||a.parentWindow:!1}function cf(a){if(!b_[a]){var
b=d("<"+a+">").appendTo("body"),c=b.css("display");b.remove();if(c==="none"||c==="")c="block";
b_[a]=c}return b_[a]}function ce(a,b){var c={};d.each(cd.concat.apply([],cd.slice(0,b)),function()
{c[this]=a});return c}function b$(){try{return new a.ActiveXObject("Microsoft.XMLHTTP")}catch(b)
{}}function bZ(){try{return new a.XMLHttpRequest}catch(b){}}function bY(){d(a).unload(function()
{for(var a in bW)bW[a](0,1)})}function bS(a,c){a.dataFilter&&(c=a.dataFilter(c,a.dataType));var
e=a.dataTypes,f={},g,h,i=e.length,j,k=e[0],l,m,n,o,p;for(g=1;g<i;g++){if(g===1)for(h in
a.converters)typeof h==="string"&&(f[h.toLowerCase()]=a.converters[h]);l=k,k=e[g];
if(k==="*")k=l;else if(l!=="*"&&l!==k){m=l+" "+k,n=f[m]||f["* "+k];if(!n){p=b;for(o in f){j=o.split("
");if(j[0]===l||j[0]==="*"){p=f[j[1]+" "+k];if(p){o=f[o],o===!0?n=p:p===!0&&(n=o);break}}}}!n&&!p&&
d.error("No conversion from "+m.replace(" "," to ")),n!==!0&&(c=n?n(c):p(o(c)))}}return c}function
bR(a,c,d){var e=a.contents,f=a.dataTypes,g=a.responseFields,h,i,j,k;for(i in g)i in d&&(c[g*]=d*);
while(f[0]==="*")f.shift(),h===b&&(h=a.mimeType||c.getResponseHeader("content-type"));if(h)for(i
in e)if(e*&&e*.test(h)){f.unshift(i);break}if(f[0]in d)j=f[0];else{for(i in d){if(!f[0]||a.converters[i+"
"+f[0]]){j=i;break}k||(k=i)}j=j||k}if(j){j!==f[0]&&f.unshift(j);return d[j]}}function bQ(a,b,c,e)
{if(d.isArray(b)&&b.length)d.each(b,function(b,f){c||bs.test(a)?e(a,f):bQ(a+"["+(typeof
f==="object"||d.isArray(f)?b:"")+"]",f,c,e)});else if(c||b==null||typeof b!=="object")e(a,b);else
if(d.isArray(b)||d.isEmptyObject(b))e(a,"");else for(var f in b)bQ(a+"["+f+"]",b[f],c,e)}function
bP(a,c,d,e,f,g){f=f||c.dataTypes[0],g=g||{},g[f]=!0;var h=a[f],i=0,j=h?h.length:0,k=a===bJ,l;
for(;i<j&&(k||!l);i++)l=h*(c,d,e),typeof l==="string"&&(!k||g[l]?l=b:
(c.dataTypes.unshift(l),l=bP(a,c,d,e,l,g)));(k||!l)&&!g["*"]&&(l=bP(a,c,d,e,"*",g));return l}function
bO(a){return function(b,c){typeof b!=="string"&&(c=b,b="*");if(d.isFunction(c)){var
e=b.toLowerCase().split(bD),f=0,g=e.length,h,i,j;for(;f<g;f++)h=e[f],j=/^\+
/.test(h),j&&(h=h.substr(1)||"*"),i=a[h]=a[h]||[],i[j?"unshift":"push"](c)}}}function bq(a,b,c){var
e=b==="width"?bk:bl,f=b==="width"?a.offsetWidth:a.offsetHeight;if(c==="border")return
f;d.each(e,function()
{c||(f-=parseFloat(d.css(a,"padding"+this))||0),c==="margin"?f+=parseFloat(d.css(a,"margin"+this))||
0:f-=parseFloat(d.css(a,"border"+this+"Width"))||0});return f}function bc(a,b)
Bleaggggh!