Putting a little bit of logic in markup is OK, and Yahoo store pages are a good example of when that is appropriate because Yahoo store merchants just want some

Putting a little bit of logic in markup is OK, and Yahoo store pages are a good example of when that is appropriate because Yahoo store merchants just want some customization logic not a full-blown web app. Putting a lot of logic in markup gets messy fast hence the rise in popularity of MVC frameworks for web apps. Even ASP had to evolve from "code in front" to "code behind" support in ASP.NET.