added hooks for accessibility on add/remove child node
assert that image is available in scenery.Image constructor
added hooks for accessibility on add/remove child node
assert that image is available in scenery.Image constructor
Merge branch 'accessibility-3' of https://github.com/phetsims/scenery into accessibility-3
merge master to accessibility branch
Removed unused code
Added a sub-canvas for accessibility
Created a focus rectangle scene
Added AccessibilityPeer
removed interactive call from accessibility peer, since it was causing focusing to fail
converted from scenery.Scene to use a manually coded svg div layer
removed unused focus scene flag
added (commented out) code for rectangle animation
moved accessible peer layer from scenery.Scene to managed div layer
minor cleanup in AccessibilityPeer
Merging in master
Removing wrong accessibility peer, notes
merging from master
Merge branch 'instances' into accessibility-3