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

Miscellaneous/web/html-tags.txt

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+a
+abbr
+acronym
+address
+animate
+animatemotion
+animatetransform
+applet
+area
+article
+aside
+audio
+b
+base
+basefont
+bdi
+bdo
+bgsound
+big
+blink
+blockquote
+body
+br
+button
+canvas
+caption
+center
+cite
+code
+col
+colgroup
+command
+content
+custom tags
+data
+datalist
+dd
+del
+details
+dfn
+dialog
+dir
+discard
+div
+dl
+dt
+element
+em
+embed
+fieldset
+figcaption
+figure
+font
+footer
+form
+frame
+frameset
+h1
+head
+header
+hgroup
+hr
+html
+i
+iframe
+image
+image2
+image3
+img
+img2
+input
+input2
+input3
+input4
+ins
+isindex
+kbd
+keygen
+label
+legend
+li
+link
+listing
+main
+map
+mark
+marquee
+menu
+menuitem
+meta
+meter
+multicol
+nav
+nextid
+nobr
+noembed
+noframes
+noscript
+object
+ol
+optgroup
+option
+output
+p
+param
+picture
+plaintext
+pre
+progress
+q
+rb
+rp
+rt
+rtc
+ruby
+s
+samp
+script
+section
+select
+set
+shadow
+slot
+small
+source
+spacer
+span
+strike
+strong
+style
+sub
+summary
+sup
+svg
+table
+tbody
+td
+template
+textarea
+tfoot
+th
+thead
+time
+title
+tr
+track
+tt
+u
+ul
+var
+video
+wbr
+xmp