Well .. I am new to web development and I want to know what does toolkit independent framework mean?
There are two major types of software libraries: frameworks and toolkits (component libraries). A framework provides architecture, a toolkit provides functionality.
Most frameworks out there come bundled with their own toolkits. There's even some so-called 'frameworks' that are basically just toolkits and the only architecture they provide is intended to make the included components work together.
A toolkit independent framework is a framework that doesn't depend on a specific toolkit, i.e. you can use it with a number of (framework independent) toolkits.
The only Google hits for the phrase "toolkit independent web framework" are for this very question.
So, given that you apparently coined the phrase yourself, how about you tell us what it means?