I was goofing around with the ::placeholder pseudoelement on Codepen (Chrome 59.0.3071) when I noticed something odd. (please see my JSFiddle)
In brief, this CSS should not enable a transition of the ::placeholder color over 2s:
input::placeholder {color:red;transition:2s;}
input:hover::placeholder {color:green}
Using Firefox, there is no color transition over a 2 second interval on hover (this appears to be correct according to this section of a W3C spec and this section of a different one - follow the thread to the ::first-line pseudo-element), but instead there is an immediate color transition to green;
However, the same JSFiddle using Chrome does show a ::placeholder color transition over a period of 2 seconds, which according to the specs, appears to be incorrect.
Is this a bug in this version of Chrome (and if so, is it being addressed?) or is this an indictment of my lack of understanding of CSS?