How to apply the legibility principles to screen reading? What is important point for it?
What is the difference between the "legibility" and "readability"?
If you look at the dictionary definitions, it doesn't seem like a lot of distinction between the two:
Practically speaking, legibility has to do with being able to recognize the characters on the screen. Readability has to do with the long term effects of using the font/background/etc. Assuming the font is legible (you can make sense of the letters), a reader may experience eye fatigue reading the font for an extended period of time.
You don't want to base the main content of a web site with a font that has low readability. However, using a splash of fonts with lower readability for your titles can give your design freshness. You just don't want to overdo it.
Consider these example problems: