This would seem like an obvious question, but I'm not seeing any really serious info. I want to be able to apply html/css markup to a text widget. I've tried, but WP (3.3.2) seems to blow most of it off. For example I put this in a text widget:
<br /> <br /> <h1>Hello World<h1> <p> Lot of text. Blah, blah, blah. . . . </p>
and it seems to recognize only the two line breaks. It blows off the <h1>. Is there a good tutorial somewhere? I see all sorts of what must be text widgets with wildly elaborate custom formatting.