This may be a dumb question, but that fuzzy blue color that you get when focusing on stuff? Yeah, the one I’m getting when focused on this textarea right now. I’m guessing it’s a browser thing, but I want to know: what causes this?
More importantly, I notice that when TAB-bing around my own web app, this does not happen. What am I doing to cause this behavior to break, or alternately, what can I do to enable this behavior on my own site?
EDIT: There seems to be confusion about exactly what behavior I’m referring to, so here it is:

In css, the style of an input can be set with ‘:focus’.
Take a look at this page for further information: W3Schools.
A browser can have a default stylesheet, which can result in the blue color you are referring to.