[tzs]

I have no idea how to read the table on that site.

What is the difference between a red check mark and a green check mark?

What is the difference between a red X and a green X?

[paulschreiber]

Green check mark means its presence is good (i.e. HTTPS support). Red X means its absence is bad

Footnote [2] explains SNI support (where the red check mark is “bad.”)