Side-channel attacking browsers through CSS3 features
Equally worth surfacing:  Habalov reported the bug to Google and Mozilla engineers,
  who fixed the issue in Chrome 63 and Firefox 60.

  "The bug was addressed by vectorizing the blend mode 
  computations," Habalov said. Safari's implementation 
  of CSS3 mix-blend-mode was not affected as the blend 
  mode operations were already vectorized.