Zen Mugs a perfect example

The item on Zen Mugs (which I clicked on) is a perfect example of what seems to be going on these days. I clicked on and it came up narrow so I expanded it to restore full web width --- which it does. But a damned nuisance

So many web sites have gone to this procedure. Have I missed summat or has my browser gone belly-up?

Got the link to this zen mugs item

Sounds almost like you are trying to explain a responsive web page design, i.e. where the page layout varies according to the device and web page size.

NOTE: If per chance the link is a forums.thinkbroadband.com then we do not have a responsive design at all