after
before
#if ENABLE(VIDEO_TRACK)
cue
#endif
first-letter
first-line
marker
part
placeholder, PseudoElementWebKitCustom
-webkit-input-placeholder, PseudoElementWebKitCustomLegacyPrefixed
-webkit-resizer
-webkit-scrollbar
-webkit-scrollbar-button
-webkit-scrollbar-corner
-webkit-scrollbar-thumb
-webkit-scrollbar-track
-webkit-scrollbar-track-piece
selection
slotted