Entries To Add

[SaraSoueidan]

I've opened this issue to keep track of all additional concept entries that I want to add as soon as possible to the reference. These entries include:

• attribute selectors
• media queries (including different possible conditions, etc.)
• Combinators
• all property entry
• appearance property entry

The list will be updated with other entries when necessary and, of course, comments and more suggestions are welcome in the comments!

[crnacura]

Moving this to #76