Forum Moderators: open
I could quite happily use it in a FAQ, for example, or encircle a highlighted paragraph.
What's the deal?
From the HTML 4.01 specs [w3.org]:
The FIELDSET element allows authors to group thematically related controls and labels. Grouping controls makes it easier for users to understand their purpose while simultaneously facilitating tabbing navigation for visual user agents and speech navigation for speech-oriented user agents. The proper use of this element makes documents more accessible.
So if you have a sign-up form for your social networking site, you could have fieldsets with legends like 'webdesign skills' to group the fields years and level, and 'painting skills' to group another set of years and level. By putting similarly labelled fields in distinct fieldsets, user agents can keep them apart.
(If I were an HTML specs author, I'd probably make LEGEND a property of FIELDSET rather than an element.)