New posts in fieldset

Which CSS tag creates a box like this with title?

html css fieldset legend

Is it possible to achieve a <fieldset>-like effect without using the <fieldset> tag?

html css fieldset

Why do <fieldset>s clear floats?

html css forms css-float fieldset

How can I make a fieldset legend-style "background line" on heading text?

css header legend fieldset

Is there any way to have a fieldset width only be as wide as the controls in them?

html css fieldset

Why do we need a fieldset tag?

<fieldset> resizes wrong; appears to have unremovable `min-width: min-content`

html width fieldset css