How to apply the legibility principles to screen reading? What is important point for it?
What is the difference between the "legibility" and "readability"?
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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: