Passive event listeners

Category: User input
Type: New or changed feature
Status: Enabled by default (Chrome 51)
Intent stage: None

Summary

Expose "passive" boolean in the EventListenerOptions dictionary. Implement the behaviour with respect to dispatching passive EventListeners so that calling preventDefault inside executing the passive registered callback only generates a warning to the console. Can be used to dramatically improve scrolling performance.

Standards & signals

Specification: https://dom.spec.whatwg.org/#dom-eventlisteneroptions-passive
Firefox: Shipped/Shipping
Safari: Shipped/Shipping
Web developers: Positive
Tracking bug: http://crbug.com/489802

Docs: https://github.com/RByers/EventListenerOptions/blob/gh-pages/explainer.md

Samples: https://rbyers.github.io/scroll-latency.html

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