API Notes

jawz101- Feel free to fill in the blanks, rearrange, etc. I didn't know how to break up some of the stuff in the GENERAL section but I was going for general site layout-type stuff under general but much of the general section is probably deserves better categorization (console API, WEBRTC, Crypto, etc.)

Note: This add-on's advantage over simply disabling features via about:config prefs is that the web site gets a more graceful response versus completely disabling a web feature that is typically expected in a modern web browser.

GENERAL	BREAKAGE	about:config pref
Console API
CSS Conditional Rules Module Level 3
CSS Font Loading Module Level 3		layout.css.font-loading-api.enabled
CSS Object Model (CSSOM)
CSSOM View Module
Directory Upload
DOM
DOM Level 1
DOM Level 2: Core
DOM Level 2: Events
DOM Level 2: HTML	Hulu.com
DOM Level 2: Style	xda-developers
DOM Level 2: Traversal and Range
DOM Level 3: Core
DOM Level 3: XPath
DOM Parsing and Serialization
execCommand
Fetch	Hulu.com
File API	YouTube	dom.fileHandle.enabled
HTML
HTML 5
HTML 5.1
HTML: Canvas Element	maps.google.com
HTML: Channel Messaging	facebook notifications button
HTML: History Interface
HTML: Plugins
Non-Standard
Pointer Lock
Scalable Vector Graphics (SVG) 1.1 (Second Edition)	iplists.firehol.org	svg.disabled
Selection API	creating a reddit comment
Selectors API Level 1
Shadow DOM
Tracking Preference Expression (DNT)	DuckDuckGo honors DNT	privacy.donottrackheader.enabled
URL
W3C DOM4
Web Cryptography API
WebRTC 1.0: Real-time Communication Between Browser		media.peerconnection.enabled
XMLHttpRequest
Push API	Gmail, Google Docs	dom.push.enabled

PERSISTENCE/ACTIVE CONNECTIONS	BREAKAGE	about:config pref
Beacon	low risk	beacon.enabled
HTML: Broadcasting
HTML: Web Sockets
HTML: Web Storage	Facebook	dom.storage.enabled
HTML: Web Workers		dom.workers.enabled
Indexed Database API		dom.indexedDB.enabled
Service Workers	if you want FB/gmail notifications	dom.serviceWorkers.enabled
Web Notifications		dom.webnotifications.enabled

AUDIO/VISUAL/DRM	BREAKAGE	about:config pref
Encoding
Encrypted Media Extensions		media.eme.enabled
Fullscreen API	YouTube	full-screen-api.enabled
Media Capture and Streams
Media Capture from DOM Elements
Media Source Extensions	YouTube	media.mediasource.enabled
MediaStream Recording
Web Audio API		dom.webaudio.enabled
WebGL Specification		webgl.disabled
WebVTT: The Web Video Text Tracks Format		media.webvtt.enabled (old pref)

PHYSICAL ENVIRONMENT	BREAKAGE	about:config pref
Ambient Light Sensor API	low risk	device.sensors.enabled
Battery Status API	low risk	dom.battery.enabled
DeviceOrientation Event Specification	low risk	device.sensors.enabled?
Gamepad	low risk	dom.gamepad.enabled
Geolocation API	low risk	geo.enabled
Geometry Interfaces Module Level 1	low risk
Proximity Events	low risk	device.sensors.enabled?
Screen Orientation API	low risk	device.sensors.enabled?
Vibration API	low risk	dom.vibrator.enabled

BROWSER ENVIRONMENT	BREAKAGE	about:config pref
High Resolution Time Level 2	smrt-game.com	dom.event.highrestimestamp.enabled
Navigation Timing
Page Visibility (Second Edition)
Performance Timeline
Performance Timeline Level 2
Resource Timing		dom.enable_resource_timing
Timing / Performance Detection
Timing Control for Script-Based Animations
UI Events Specification
User Timing Level 2