Comparison between Oracle Forms and HTML DB

Something that has always puzzled me...
What is the difference between Oracle Forms 10g and HTML DB from a functionality perspective?
http://www.oracle.com/technology/products/forms/index.html
The underlying architecture, technology used, etc might be different, but from the user's point of view, dont they both do pretty much the same thing?
Why did Oracle take the time & effort to invest in building HTML DB from the ground up (with its mod_plsql, webdb, etc earlier pedigree) instead of just investing in Oracle Forms which has a well-established history, customer base?
Thanks

This is purely a layman's perspective, but after using Developer Forms 10g intensively for about 9 months, and now just recently getting into HTML DB, my opinion is this:
HTML DB is really really great for 'quick and dirty' forms and reports deployment when there's not a lot of validation to be done. Not to say you can't do any kind of validation, I just personally don't find it intuitively easy to implement after using Developer forms so much. So far doing the layout has been hard for me, as I'm used to the 'drag and drop' aspect of Oracle Forms, but once you have your layout set, it pretty much takes care of resizing itself when your application is viewed on various screen sizes and resolutions.
Developer forms has been, for me, way easier to use to accomplish all the validations I need using PL/SQL (you can use java, too, but I haven't learned enough java yet to do that). However, it's more demanding to deploy. You have your application server to maintain, you have to copy over your forms modules, your menu modules, your library modules, make sure everything is compiled properly so your form doesn't crash when someone navigates from one field to another, etc. Also, from a dynamic layout perspective, it's a little harder to design for various screen sizes, resolutions, etc. The html in HTML DB takes care of that for you.
So basically I'm finding that each technology fills a certain niche better than the other. The fun is in trying which technology fits with which niche.

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