Audio & Video

• VTTCue.positionAlign now uses PositionAlignSetting instead of AlignSetting
• RTCPeerConnection.getLocalStreams(), getRemoteStreams() have been deprecated
• Invalid <track kind> will be treated as metadata instead of subtitles

Canvas & WebGL

• Regressed Specific Canvas text effects are not rendered properly

CSS

• Affecting Support for #RGBA colour values may validate previously invalid values
• text-align-last has been unprefixed
• :dir CSS pseudo-class has been unprefixed

DOM

• Reverted load event is no longer fired on <iframe> with JavaScript src returning non-string value
• Some KeyboardEvent.key values have been renamed
• <label> no longer has form attribute
• File.lastModifiedDate has been deprecated
• Pop-up window is now scrollable by default
• Microdata API has been removed
• fetch() and Request now throws if redirect is detected when in non-follow redirect mode
• TouchList.identifiedTouch() has been removed

HTML

• <label> no longer has form attribute

JavaScript

• Reverted load event is no longer fired on <iframe> with JavaScript src returning non-string value
• Date.parse handling of 2-digit years has been changed to be Chrome compatible
• Affecting Non-standard flags argument has been removed from String search methods

Miscellaneous

Networking

Plug-ins

• Regressed Flash objects are not positioned properly according to salign attribute
• Regressed Some Flash content is broken due to async rendering mode
• Some non-essential Flash plug-in content will be blocked

Privacy & Security

SVG

• <altGlyph> is no longer supported