From http://www.w3schools.com (Copyright Refsnes Data)

HTML 5 <fieldset> tag

Definition and Usage

The fieldset element is used to logically group together elements in a form, and draw a box around them.

Differences Between HTML 4.01 and HTML 5

HTML 5 has some new attributes, and some HTML 4.01 attributes are no longer supported.

Tips and Notes

Note: You can disable a fieldset with the new attribute: disabled.

Tip: Use the <legend> element to add a caption to the fieldset.

Example

Source	Output
<fieldset> Height <input type="text" size="3" /> Weight <input type="text" size="3" /> </fieldset>	Height Weight

Attributes

4: indicates if the attribute is defined in HTML 4.01
5: indicates if the attribute is defined in HTML 5

Attribute	Value	Description	4	5
disabled	true \| false	Defines if the fieldset is visible or not		5
form	true \| false	Defines one ore more forms the fieldset belongs to		5

Standard Attributes

class, contenteditable, contextmenu, dir, draggable, id, irrelevant, lang, ref, registrationmark, tabindex, template, title

For a full description, go to Standard Attributes in HTML 5.

Event Attributes

onabort, onbeforeunload, onblur, onchange, onclick, oncontextmenu, ondblclick, ondrag, ondragend, ondragenter, ondragleave, ondragover, ondragstart, ondrop, onerror, onfocus, onkeydown, onkeypress, onkeyup, onload, onmessage, onmousedown, onmousemove, onmouseover, onmouseout, onmouseup, onmousewheel, onresize, onscroll, onselect, onsubmit, onunload

For a full description, go to Event Attributes in HTML 5.

Try-It-Yourself Demos

Fieldset around data
How to draw a border with a caption around your data.