File: date/date_popup/themes/datapicker.css
Line: 204
Fragment: filter: mask(); /*must have*/

I don't know what should be done here but acording to my knowledge there is no functions in CSS so i suggest to just delete this line.

Comments

karens’s picture

karens commented
Status: Active » Closed (duplicate)

Duplicate of #352975: Remove filter: mask(), which breaks CSS validation.