The HTML Language - HTML Manual of Style - page 55

onabort onblur oncanplay

oncanplaythrough onchange onclick

oncontextmenu ondblclick ondrag

ondragend ondragenter ondragleave

ondragover ondragstart ondrop

ondurationchange onemptied onended

onerror onfocus onformchange

onforminput oninput oninvalid

onkeydown onkeypress onkeyup

onload onloadeddata onloadedmetadata

onloadstart onmousedown onmousemove

onmouseout onmouseover onmouseup

onmousewheel onpause onplay

onplaying onprogress onratechange

onreadystatechange onscroll onseeked

onseeking onselect onshow

onstalled onsubmit onsuspend

ontimeupdate onvolumechange onwaiting

In HTML5, a web developer can create his own attributes to add to any
HTML element as long as the attribute name begins with the characters
"data-" and has at least one more letter or number following the dash. As
many data attributes as needed can be added to an HTML element, provided
that there are no duplicate attribute names in any single element. he value
of a data attribute follows the same restrictions as other attributes: Charac-
ter entities are needed for special symbols, but other markup is not parsed as
HTML. For example, the following HTML element (a list item) has extra data
attributes that can be used by a client-side script to sort a listing or highlight
speciic items in response to a user action.

<li class="book-title"
data-borrower="Vonnegut, K."
data-status="overdue"> Venus On The Half-Shell </li>