UI Packages Differences

I checked two main packages which are the most common in the web at this time.
YUI and DOJO are competing with different approaches but the results are almost the same.

Yahoo UI (YUI)
Is a package developed by many prestigious people. An open source managed by Yahoo also gives the guaranty that the product will continue to grow and also will lead the standards in market.

This is a package for UI and not just JavaScript Package. The product lets the users handle the basic code as before, but the package ads more functionality. The basic code continues to work.

Dojo
Is an Open Source product built on several code bases. The package is growing all the time and was adopted by many companies as their main DHTML package. This gives some guarantee that the product is stable, free of bugs and will continue to exist for a long time.

Dojo’s approach is to add specific attributes to an Element it means that they add a kind of taglibs directly to the HTML code. It makes very easy to code since it’s not always necessary to use JavaScript. In one way it’s easy to code but in other way it makes the code completely dependent on the package and it also generates DTD errors since the attributes are not recognized by W3G. It’s possible to generate to instantiate the same features by JavaScript (like YUI).