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

HTML 5 <rule> tag

Definition and Usage

The <rule> tag defines the rules for updating a datatemplate. Used togheter with the elements <datatemplate> and <nest>.

Differences Between HTML 4.01 and HTML 5

The <rule> tag is new in HTML 5.

Attributes

Attribute	Value	Description
condition	selector	Defines which elements that will be updated
mode	mode	Defines which mode the datatemplate's rules will have

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.