Many tests for emerging browser features were added to the Modernizr github repo recently. You can view them there.
Here's an quick list of all the detects the community has crafted the best-in-class detection techniques for.
a-download
audio-audiodata-api
audio-webaudio-api
battery-api
battery-level
canvas-todataurl-type
contenteditable
contextmenu
cookies
cors
css-backgroundcliptext
css-backgroundrepeat
css-backgroundsizecover
css-cubicbezierrange
css-displayrunin
css-hyphens
css-mask
css-mediaqueries
css-overflow-scrolling
css-pointerevents
css-remunit
css-resize
css-scrollbars
custom-protocol-handler
dataview-api
dom-classlist
dom-dataset
dom-microdata
elem-datalist
elem-output
elem-ruby
elem-time
elem-track
emoji
es5-strictmode
file-api
file-filesystem
forms-speechinput
forms-validation
fullscreen-api
gamepad
getusermedia
ie8compat
img-apng
json
lists-reversed
mathml
network-connection
network-eventsource
notification
notifications
performance
quota-management-api
requestanimationframe
script-async
script-defer
unicode
userdata
webgl-extensions
websockets-binary
workers-blobworkers
workers-dataworkers