"Added non-passive event listener" warning in Chrome

[lguminski]

Chrome complains with

[Violation] Added non-passive event listener to a scroll-blocking 'touchstart' event. Consider marking event handler as 'passive' to make the page more responsive. See https://www.chromestatus.com/feature/5745543795965952

due to

dat.gui/src/dat/dom/dom.js

Line 167 in 3f6f66d

elem.addEventListener(event, func, bool);