Added the entire XSS Cheat Sheet of PortSwigger, their HTML events and tags.

Miscellaneous/web/html-events.txt

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+onactivate
+onafterprint
+onanimationcancel
+onanimationend
+onanimationiteration
+onanimationstart
+onauxclick
+onbeforeactivate
+onbeforecopy
+onbeforecut
+onbeforedeactivate
+onbeforepaste
+onbeforeprint
+onbeforeunload
+onbegin
+onblur
+onbounce
+oncanplay
+oncanplaythrough
+onchange
+onclick
+oncontextmenu
+oncopy
+oncut
+ondblclick
+ondeactivate
+ondrag
+ondragend
+ondragenter
+ondragleave
+ondragover
+ondragstart
+ondrop
+onend
+onended
+onerror
+onfinish
+onfocus
+onfocusin
+onfocusout
+onhashchange
+oninput
+oninvalid
+onkeydown
+onkeypress
+onkeyup
+onload
+onloadeddata
+onloadedmetadata
+onloadend
+onloadstart
+onmessage
+onmousedown
+onmouseenter
+onmouseleave
+onmousemove
+onmouseout
+onmouseover
+onmouseup
+onpageshow
+onpaste
+onpause
+onplay
+onplaying
+onpopstate
+onreadystatechange
+onrepeat
+onreset
+onresize
+onscroll
+onsearch
+onseeked
+onseeking
+onselect
+onstart
+onsubmit
+ontimeupdate
+ontoggle
+ontransitioncancel
+ontransitionend
+ontransitionrun
+onunhandledrejection
+onunload
+onvolumechange
+onwaiting
+onwheel