1. Do you use a framework? Is so what is it?
Yes. I have used:
Twitter Bootstrap
Zurb Foundation
HTML5 Boilerplate
Half a dozen other grid-only frameworks.
2. What are the top three things you look for/use in a framework?
Flexibility
Cross-browser support
Support for RTL
3. Have you used any of the above frameworks? What was your experience?
The current leaders are Twitter Bootstrap and Zurb Foundation. I have used both, and in one case, borrowed and combined the useful bits from each one.
I liked Twitter Bootstrap more than Zurb Foundation, though the latter had a superior grid system when I last used it.
4. Which frameworks do you recommend staying away from?
HTML5 Boilerplate shouldn't even be a candidate. It's an example of good, semantic markup, but it isn't a UI framework.
5. If you had to choose one framework for Joomla, what would it be?
This is a useless question, as there are no other options for a framework... only Bootstrap, as Kyle has already done the work. The options are:
1.) Use Twitter Bootstrap
2.) Stick with Bluestork (hopefully minus the little css page peel turds on the control panel)
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Years ago on the dev lists, you put your weight behind Mootools, even when jQuery core devs kindly offered to help us migrate to jQuery.
Even then, the web development community had overwhelmingly backed jQuery, and there were way more plugins, tutorials, and resources for jQuery than there were for Mootools. Your argument was that in some advanced corner-cases, Mootools was better than jQuery. This argument was of course completely irrelevant to the vast, vast majority of Joomla's target market. It was a selfish argument for maintaining the status quo because it suited you, rather than the Joomla community.
Today, many years later, you STILL want to disregard the fact that the web development community has
made a choice.
Let us not forget poor choices made in the past that continue to cost us many years later, and let us not repeat the same mistakes.
Between Bluestork and Kyle's Bootstrapped template (does it have a name yet?), Kyle's is the obvious choice.
OT: Why does a forum, let alone a UX forum, have a CAPTCHA form presented to registered users? This is my fourth attempt getting past it.