According to MDN, the list attribute can be used for <input> elements of type color to provide a list of predefined colors. That page also indicates that
line-plot
spring-resttemplate
netlogo
histogram-equalization
nvram
sqlite
error-checking
imdf
bootsfaces
remote-server
refund
poller
mt4
geotext
getlocation
most-vexing-parse
bitnami
webpacker
watson-knowledge-studio
integer-partition
monkeylearn
webgl
key-bindings
pppd
api-authorization
probability-density
la4j
tcolor
pdfmerger
appender