css - what does reference pixel mean? -

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what "reference pixel" mean , difference between , "hardware pixel"? "css pixel" or different thing? how reference pixel enhance web page views on smart phones?

what reference pixel mean

the reference pixel visual angle of 1 pixel on device pixel density of 96dpi , distance reader of arm's length. nominal arm's length of 28 inches, visual angle therefore 0.0213 degrees. reading @ arm's length, 1px corresponds 0.26 mm (1/96 inch).

what difference between , hardware pixel

the difference between hardware pixels , css reference pixels reported browser.

is css pixel or css pixel different thing

yes, css/reference/viewport pixels have same mean

how reference pixel enhances web pages views on smart phones

this link question:

http://alistapart.com/article/a-pixel-identity-crisis/

http://www.siolon.com/blog/understanding-hardware-and-css-pixels/


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