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2
  • It might work using the :invalid pseudo selector. As for the "drop-hover", no, not with CSS alone...
    – Andrei V
    Commented Mar 17, 2017 at 9:35
  • @Andrei Neat idea to actually use the :invalid at least for now (because even if I did not think of it, I actually want to show that a "normally selected file" is not acceptable too)
    – Xenos
    Commented Mar 17, 2017 at 10:03