disable error on check book

if use -webkit-text-fill-color: #bd2716 string on my epub with calibre, i have one error on check book:
CSS: Property: Unknown Property name. [1:20: -webkit-text-fill-color]

but on my ipad, on night mode read, this string work correctly....
now (this post it's for the creator of calibre) on new version you can put on calibre editor the possibility to exclude this kind of error??

i've understand that this type of error does not work on some readers, but i want only the possibility to exclude this error form my check book (temporarily)...
tanxs. bye!