I wish there was a live property list on W3C, or better yet, a an up-to-date API that spits out json. So far I've been semi-successful scraping from these pages:
- animations
- box
- fonts
- fragmentation
- generated content
- hyperlinks
- multi-column layout
- positioning
- speech
- transforms
- transitions
- user interface
- device viewport
- flexbox
- grid-layout
- lists
- ruby
- text
- template layout
