First reported https://community.plot.ly/t/violation-at-console/4518/7

To see it, open up https://codepen.io/etpinard/pen/ZyLQYy and turn on Verbose mode

The error message points to this line in dragbox.js.

[Violation] Added non-passive event listener to a scroll-blocking 'wheel' event. 
Consider marking event handler as 'passive' to make the page more responsive.

Observed in Chrome 59 and 58.

Anyone know what this is about?