I must be missing something, because isn't 3 images side by side just:
<div><img ...><img ...><img ...></div>
? But you're right, the web isn't a UI platform. It's designed for to produce things that are like Microsoft Word documents. Web-apps are like using MSWord's scripting and text layout to produce a MSWord-app. Yeah, one can do it, but it's like cutting a steak with a spoon.