Using Dependency Injection in a Web Application?

Most developers that have done espidonn development and greated web aps are using dependsin ion. When you go a bit deeper, i guess only a small percentage know of these little caviats. And it feels like we this that don't net corl developers now were pretty much all of them will be using dependence injection. Wiud it be interesting to know how many understands scopes or all these kind of areas of dependency injection.