JavaScript Diff

body{font-family:'trebuchet ms',verdana,sans-serif;font-size:13px}
html,body,h1,h2,h3,h4,p,pre{margin:0;padding:0}
img{border:0}
body{margin:0;background:#ddd;color:#000}
#canvas{width:780px;margin:auto;padding:10px;background:#fff;border:solid 1px #666;border-top:0;border-bottom:0}
#user{float:right;font-size:.85em;clear:both}
#identity{height:110px;position:relative}
#identity img{float:left;padding-right:10px}
#identity p{margin-bottom:4px}
#identity a#home{font-size:1.5em;color:#E06018;text-decoration:none}
#identity a#home:hover{text-decoration:underline}
#main{overflow-y:auto;float:left;width:560px;min-height:400px;margin-bottom:10px;clear:both}
#main p,pre{margin-bottom:10px;clear:both}
h1{font-size:1.4em;margin-bottom:10px;border-bottom:solid 2px #E06018;padding:5px 0;color:#666}
h2{font-size:1em;margin-bottom:5px;color:#E06018}
h4{margin:2px;font-size:1em;background:#ddd}
ul{margin-top:0;margin-bottom:5px}
acronym{border-bottom:dotted 1px #00f}
img.inline{float:left;margin-right:10px}
p.code{font-family:monospace;font-size:11px;background:#FAF4B8;padding:10px;width:538px;overflow-x:auto}
code{color:#00f}
.comment{color:#099}
#nav{float:left;width:200px;margin-left:20px}
#nav div{border:solid 1px #E06018;margin-bottom:10px}
#nav p{margin-bottom:5px}
a.external{background:url(icon_popup.gif) right no-repeat;padding-right:15px}
a.mailto{background:url(icon_mail.gif) center right no-repeat;padding-right:18px}
table.stripe{border-top:solid 1px #ccf;margin-bottom:10px}
td{border-bottom:solid 1px #ccf;vertical-align:top}
.stripe tr.odd{background:#eef}
.niceform{background:#eee;border:solid 1px #E06018;padding:5px}
.niceform ul{margin:5px 0;padding:0}
.niceform li{list-style:none;clear:both}
label{display:block;float:left;width:70px}
input{width:300px}
input.check{width:auto}
textarea{display:block;width:540px;height:100px;font-family:arial,helvetica,sans-serif;}
#comments ol{margin:0;padding:0}
#comments li{list-style:none;;border-top:solid 1px #E06018;padding:5px}
#comments p{margin:0 0 0 5px;padding:0 0 0 5px;border-left:solid 5px #ddd}
.tagcloud ul{margin:0;padding:5px}
.tagcloud li{list-style:none;display:inline;font-size:11px}
.tag1{font-size:1em;color:#9696FF}
.tag2{font-size:1.2em;color:#7878FF}
.tag3{font-size:1.4em;color:#5A5AFF}
.tag4{font-size:1.6em;color:#3C3CFF}
.tag5{font-size:1.8em;color:#1E1EFF}
.tag6{font-size:2em;color:#0000FF}

body{font-family:'trebuchet ms',verdana,sans-serif;font-size:13px}
html,body,h1,h2,h3,h4,p,pre{margin:0;padding:0}
img{border:0}
body{margin:0;background:#ddd;color:#000}
#canvas{width:780px;margin:auto;padding:10px;background:#fff;border:solid 1px #666;border-top:0;border-bottom:0}
#topnav{margin:0;padding:0 20px;list-style:none;height:18px;background:#fc0;border-bottom:solid 1px #333}
#topnav li,#topnav a{display:block;float:left}
#topnav a{text-decoration:none;color:#333;padding:2px 10px}
#topnav a:hover{background:#FFED80}
#topnav a.on{background:#E26300;color:#fff}
#topnav a.on:hover{background:#FC8934}
#user{float:right;font-size:.85em;clear:both}
#identity{height:110px;position:relative}
#identity img{float:left;padding-right:10px}
#identity p{margin-bottom:4px}
#identity a#home{font-size:1.5em;color:#ff0000;text-decoration:none}
#identity a#home:hover{text-decoration:underline}
#main{overflow-y:auto;float:left;width:560px;min-height:400px;margin-bottom:10px;clear:both}
#main p,pre{margin-bottom:10px;clear:both}
h1{font-size:1.4em;margin-bottom:10px;border-bottom:solid 2px #E06018;padding:5px 0;color:#666}
h2{font-size:1em;margin-bottom:5px;color:#E06018}
h4{margin:2px;font-size:1em;background:#ddd}
ul{margin-top:0;margin-bottom:5px}
acronym{border-bottom:dotted 1px #00f}
img.inline{float:left;margin-right:10px}
#viewbody div{margin-bottom:10px;border-bottom:solid 1px #ccc;padding-bottom:5px}
#viewbody strong{display:block;margin-bottom:5px}
#viewbody strong a{font-size:1.2em;color:#E06018;text-decoration:none}
#viewbody strong a:hover{text-decoration:underline}
p.code{font-family:monospace;font-size:11px;background:#FAF4B8;padding:10px;width:538px;overflow-x:auto}
code{color:#00f}
.comment{color:#090}
#nav{float:left;width:200px;margin-left:20px}
#nav div{border:solid 1px #E06018;margin-bottom:10px}
#nav p{margin-bottom:5px}
a.external{background:url(icon_popup.gif) right no-repeat;padding-right:15px}
a.mailto{background:url(icon_mail.gif) center right no-repeat;padding-right:18px}
table.stripe{border-top:solid 1px #ccf;margin-bottom:10px}
td{border-bottom:solid 1px #ccf;vertical-align:top}
.stripe tr.odd{background:#eef}
.niceform{background:#ddd;border:solid 1px #E06018;padding:5px}
.niceform ul{margin:5px 0;padding:0}
.niceform li{list-style:none;clear:both}
label{display:block;float:left;width:70px}
input{width:300px}
input.check{width:auto}
textarea{display:block;width:540px;height:100px;font-family:arial,helvetica,sans-serif;}
#newcomment p{text-align:center;margin:0}
p.buttons{text-align:center}
p.buttons input{width:80px}
h3{font-size:1em;margin-bottom:5px}
#newcomment{margin:0}
#comments ol{margin:0;padding:0}
#comments li{list-style:none;;border-top:solid 1px #E06018;padding:5px}
#comments p{margin:0 0 0 5px;padding:0 0 0 5px;border-left:solid 5px #ddd}

(Green: added - ~~red: deleted~~).

This space makes the difference.