I would actually not recommend using javascript because you will run into a lot of browser compatibility issues that need to be ironed out before you can really have a cross browser game.
Flash definitely helps solve this problem and gives you a much better coding environment that javascript can provide.

With jQuery and underscore.js, most of those differences are taken care of already.


If you want to get into heavy Canvas manipulation, then different browsers will have very different levels of support, and performance. However, for a card game, you're mostly just dragging floating img elements around the page, which all browsers support well these days.

If you don't need iOS support, then Flash is of course a reasonable option.