Some developers (not just DNN developers) neglect to add a focus style for elements that can be tabbed to. https://developer.mozilla.org/en-US/d... That is what adds the visual cue.

It is typically an easy fix but has to be evaluated depending on the modules, skins and container styles you are using.

Oops sorry, let me try that again :focus

Yes you're right, though. Within the stylesheets of your skin is where'd you take care of this. You do need to be familiar with writing HTML and CSS. If you bought a skin from the store, you should be able to edit the stylesheets to make any fixes (though you'd probably want to keep track of your changes in case you download an update or patch of that skin).

Do you mean zooming in with your browser or changing a browser setting to increase font size? This is also typically an issue with the skin itself (or module, if it's loading in css), not necessarily DNN. Unfortunately the Dnn store doesn't have that much of a review process to weed out skins with accessibility issues and the front-end developer community of Dnn is playing a bit of catch up compared to something like WordPress' front-end/theming community. I am sure you could find the same issues in WordPress themes it's just that they have such a wider pool of people creating for it at the moment.

These are definitely all possible things to do in Dnn skins though. Here is an example Dnn site that my company recently launched: http://detroitcommuterchallenge.com/ There are visual focus styles, and you can zoom the text with your browser without breaking everything on the site.

We just need to egg on the developers using Dnn to be more diligent about their code :)