Commits on Jun 16, 2020

1. Add animation and transition support for pseudo-elements …

   This change extends the DocumentAnimationSet to hold animations for
   pseudo-elements. Since pseudo-elements in Servo are not in the DOM like
   in Gecko, they need to be handled a bit carefully in stylo.  When a
   pseudo-element has an animation, recascade the style. Finally, this
   change passes the pseudo-element string properly to animation events.
   
   Fixes: #10316

   

   mrobinson committed Jun 16, 2020

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