Question

Should we learn all CSS (till version3) even if all browser don’t support and we don’t use?

Here mentioned http://meiert.com/en/indices/css-properties/ all css properties I don’t know about all even in 2.1 , should we learn about each css property of all version even if they are not in use.

I haven’t learn about these CSS 2.1 properties.

caption-side
clip
counter-increment
counter-reset
cue
cue-after
cue-before
direction
elevation
orphans
page-break-after
page-break-before
page-break-inside

pause
pause-after
pause-before

pitch
pitch-range
play-during
richness
right

size 
speak
speak-header
speak-numeral
speak-punctuation
speech-rate
stress

table-layout

unicode-bidi

voice-family

Answer 1

I would suggest downloading a “cheat sheet” (example) as a reference for those properties that you don’t use very frequently rather than attempting to memorize things that you don’t use. It’s good to try and familiarize yourself with all the capabilities — I’d suggest looking through tutorials (example, and another, and one more oriented toward design), though, and learning techniques that seem interesting rather than the standard. Eventually, you’ll come to be familiar enough with the standards that you rarely need to use your cheat sheet.