HTMLMediaElement: ratechange event - Web APIs
bubbles no cancelable no interface event target element default action none event handler property globaleventhandlers.onratechange specification html5 media examples these examples add an event listener for the htmlmediaelement's ratechange event, then post a message when that event handler has reacted to the event firing.
... using addeventlistener(): const video = document.queryselector('video'); video.addeventlistener('ratechange', (event) => { console.log('the playback rate changed.'); }); using the onratechange event handler property: const video = document.queryselector('video'); video.onratechange = (event) => { console.log('the playback rate changed.'); }; specifications specification status html living standardthe definition of 'ratechange media event' in that specification.

Document - Web APIs
globaleventhandlers.onratechange is an eventhandler representing the code to be called when the ratechange event is raised.

GlobalEventHandlers - Web APIs
globaleventhandlers.onratechange is an eventhandler representing the code to be called when the ratechange event is raised.

Global attributes - HTML: Hypertext Markup Language
ick, ondrag, ondragend, ondragenter, ondragexit, ondragleave, ondragover, ondragstart, ondrop, ondurationchange, onemptied, onended, onerror, onfocus, oninput, oninvalid, onkeydown, onkeypress, onkeyup, onload, onloadeddata, onloadedmetadata, onloadstart, onmousedown, onmouseenter, onmouseleave, onmousemove, onmouseout, onmouseover, onmouseup, onmousewheel, onpause, onplay, onplaying, onprogress, onratechange, onreset, onresize, onscroll, onseeked, onseeking, onselect, onshow, onsort, onstalled, onsubmit, onsuspend, ontimeupdate, ontoggle, onvolumechange, onwaiting.

SVG Event Attributes - SVG: Scalable Vector Graphics
ick, ondrag, ondragend, ondragenter, ondragexit, ondragleave, ondragover, ondragstart, ondrop, ondurationchange, onemptied, onended, onerror, onfocus, oninput, oninvalid, onkeydown, onkeypress, onkeyup, onload, onloadeddata, onloadedmetadata, onloadstart, onmousedown, onmouseenter, onmouseleave, onmousemove, onmouseout, onmouseover, onmouseup, onmousewheel, onpause, onplay, onplaying, onprogress, onratechange, onreset, onresize, onscroll, onseeked, onseeking, onselect, onshow, onstalled, onsubmit, onsuspend, ontimeupdate, ontoggle, onvolumechange, onwaiting graphical event attributes onactivate, onfocusin, onfocusout ...

SVG Attribute reference - SVG: Scalable Vector Graphics
ick, ondrag, ondragend, ondragenter, ondragexit, ondragleave, ondragover, ondragstart, ondrop, ondurationchange, onemptied, onended, onerror, onfocus, oninput, oninvalid, onkeydown, onkeypress, onkeyup, onload, onloadeddata, onloadedmetadata, onloadstart, onmousedown, onmouseenter, onmouseleave, onmousemove, onmouseout, onmouseover, onmouseup, onmousewheel, onpause, onplay, onplaying, onprogress, onratechange, onreset, onresize, onscroll, onseeked, onseeking, onselect, onshow, onstalled, onsubmit, onsuspend, ontimeupdate, ontoggle, onvolumechange, onwaiting graphical event attributes onactivate, onfocusin, onfocusout ...