An HTML event can be something the browser does, or something a user does.
| Attribute | Description |
| Offline | Triggers when the document goes offline |
| Onabort | Triggers on an abort event |
| onafterprint | Triggers after the document is printed |
| onbeforeonload | Triggers before the document loads |
| onbeforeprint | Triggers before the document is printed |
| onblur | Triggers when the window loses focus |
| oncanplay | Triggers when media can start play, but might has to stop for buffering |
| oncanplaythrough | Triggers when media can be played to the end, without stopping for buffering |
| onchange | Triggers when an element changes |
| onclick | Triggers on a mouse click |
| oncontextmenu | Triggers when a context menu is triggered |
| ondblclick | Triggers on a mouse double-click |
| ondrag | Triggers when an element is dragged |
| ondragend | Triggers at the end of a drag operation |
| ondragenter | Triggers when an element has been dragged to a valid drop target |
| ondragleave | Triggers when an element is being dragged over a valid drop target |
| ondragover | Triggers at the start of a drag operation |
| ondragstart | Triggers at the start of a drag operation |
| ondrop | Triggers when dragged element is being dropped |
| ondurationchange | Triggers when the length of the media is changed |
| onemptied | Triggers when a media resource element suddenly becomes empty. |
| onended | Triggers when media has reach the end |
| onerror | Triggers when an error occur |
| onfocus | Triggers when the window gets focus |
| onformchange | Triggers when a form changes |
| onforminput | Triggers when a form gets user input |
| onhaschange | Triggers when the document has change |
| oninput | Triggers when an element gets user input |
| oninvalid | Triggers when an element is invalid |
| onkeydown | Triggers when a key is pressed |
| onkeypress | Triggers when a key is pressed and released |
| onkeyup | Triggers when a key is released |
| onload | Triggers when the document loads |
| onloadeddata | Triggers when media data is loaded |
| onloadedmetadata | Triggers when the duration and other media data of a media element is loaded |
| onloadstart | Triggers when the browser starts to load the media data |
| onmessage | Triggers when the message is triggered |
| onmousedown | Triggers when a mouse button is pressed |
| onmousemove | Triggers when the mouse pointer moves |
| onmouseout | Triggers when the mouse pointer moves out of an element |
| onmouseover | Triggers when the mouse pointer moves over an element |
| onmouseup | Triggers when a mouse button is released |
| onmousewheel | Triggers when the mouse wheel is being rotated |
| onoffline | Triggers when the document goes offline |
| onoine | Triggers when the document comes online |
| ononline | Triggers when the document comes online |
| onpagehide | Triggers when the window is hidden |
| onpageshow | Triggers when the window becomes visible |
| onpause | Triggers when media data is paused |
| onplay | Triggers when media data is going to start playing |
| onplaying | Triggers when media data has start playing |
| onpopstate | Triggers when the window's history changes |
| onprogress | Triggers when the browser is fetching the media data |
| onratechange | Triggers when the media data's playing rate has changed |
| onreadystatechange | Triggers when the ready-state changes |
| onredo | Triggers when the document performs a redo |
| onresize | Triggers when the window is resized |
| onscroll | Triggers when an element's scrollbar is being scrolled |
| onseeked | Triggers when a media element's seeking attribute is no longer true, and the seeking has ended |
| onseeking | Triggers when a media element's seeking attribute is true, and the seeking has begun |
| onselect | Triggers when an element is selected |
| onstalled | Triggers when there is an error in fetching media data |
| onstorage | Triggers when a document loads |
| onsubmit | Triggers when a form is submitted |
| onsuspend | Triggers when the browser has been fetching media data, but stopped before the entire media file was fetched |
| ontimeupdate | Triggers when media changes its playing position |
| onundo | Triggers when a document performs an undo |
| onunload | Triggers when the user leaves the document |
| onvolumechange | Triggers when media changes the volume, also when volume is set to mute |
| onwaiting | Triggers when media has stopped playing, but is expected to resume |
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