&gt; We&#x27;ve all tried to stab a link with a finger only to have the page leap down so you accidentally hit the ad that you then have to kill to get at the actual page.<p>&lt;3 &lt;3 &lt;3<p>This happens so often to me. Please, people, add height&#x2F;width to your images so that when the image loads&#x2F;fails to load, the layout doesn&#x27;t change.<p>And if you&#x27;re using HTML5 postMessage for resizing iframes without scrolling, please use a fading animation on the height attribute. Side note: WHY ISN&#x27;T AUTO HEIGHT SPEC&#x27;D IN HTML5?!?!?!?!?<p>Oh, one thing I forgot: many, many people are too fucking stupid to deploy proper caching (e.g. using ETags, proper Expires headers,...) on their assets, thus causing needless requests. And for &quot;larger scope&quot; stuff you can use a HTML5 cache manifest to restrict all the queries for expiration to a single one for the manifest file.