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Clicking a button, moving the mouse pointer over part of the Web page, selecting some text on the page — these actions all fire events, and a DHTML author can write code to run in response to the event. This particular piece of code is generally known as an event handler. The Event model makes it possible for every HTML element on the page to be the source for a full set of mouse and keyboard events.
Event handlers are triggers to the JavaScript functions or the CSS elements based on the specific events normally called through the user action over the DOM elements such as events like mouseover, click etc. or specified in the code such as events such as load like loading a window or frame etc.
The following table show a set of common events that every HTML element generates in Internet Explorer.
| Event | When it occurs |
| onabort | User aborted page loading |
| onchange | User changed the value of an object |
| onclick | User clicked on an object |
| ondblclick | User double clicked an object |
| onfocus | User made an object active |
| onkeydown | When a keyboard key is on its way down |
| onkeypress | When a keyboard key is pressed |
| onkeyup | When a keyboard key is released |
| onload | Page finished loading |
| onmousedown | User pressed a mouse-button |
| onmousemove | Cursor moving on an object |
| onmouseover | Cursor moved over an object |
| onmouseout | Cursor moved off an object |
| onmouseup | User released a pressed mouse-button |
| onselect | User selected content on a page |
| onsubmit | User submitted a form |
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