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This work is now part of theofficial WHATWG DOM spec. Please file any issues/pull requests there. This repository (and its resources / discussions) are only preserved here as an archive.

Anextension to the DOM event pattern to allow listeners to disable support forpreventDefault, primarily to enable scroll performance optimizations. See theexplainer document for an overview.

• See the maincommit in the DOM specification orpull request for full details.
• The key parts of the spec affected by this areEventTarget,Observing event listeners, andpreventDefault
• Touch Events hasbeen updated to describe the performance optimization.
• Interventions issue 18 tracks the plan to "intervene" and force touch listeners to be passive in scenarios where the compat risk is low but the perf benefit large.

• SeeCanIUse entry for passive event listeners
• Chromium:shipping in Chrome 51 (launch bug)
  • Chromium bug tracking thenext step of automatically opting some listeners into passive behavior.
• WebKit:EventListenerOptions support andperformance optimization for touch listeners landed.
  • Performance optimization of wheel listeners not yet implemented.
• Firefox:Landed - planned toship in Firefox 49
• DOM4 Polyfill, or samplepolyfill here

• Summary from Google I/O 2016 Mobile Web talk
• Ilya Grigorik's talk at Chrome Dev Summit [slides]
• Discussion on twitter withdemo video
• Demo page with latency measurement
• OlderG+ post by Rick Byers

• Tips for debugging scroll jank screencast

• Feature detect in Modernizr (issue)
• Parse.ly
• jQuery
• Ember.js

• Outstanding issues
• WICG discussion
• Discussion on WhatWG
• Onediscussion on public-pointer-events
• Earlierscroll-blocks-on proposal and discussion