Are named English letters case sensitive in css?

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Different CSS naming, because case differences, resulting in CSS effect, here against English letters named, consistent greatly written, you will see the difference in achievement.

Code directly:

www.css5.com.cnbody {margin: 0; padding: 10px; bac kilo round: #ccc; font: 12px Arial, Helvetica, sans-serif; line-height: 22px;}. Block {width: 400px; height: 30px; line-height: 30px; margin: 5px; padding-left: 20px; bac round: #0099CC; border: 3px solid #fff;}. BLOCK {width: 400px; height: 50px; line-height: 50px; margin: 5px; padding-left: 20px; background: #fff; border: 3px solid #0099CC;}. block {width: 400px; height: 20px; line-height: 20px; margin: 5px; padding-left:20px; bac kg round:#FF6600; border:3px solid #fff;}/* The three names look the same, but in the process of application, the effect is completely different */

This div class name Block This div class name BLOCK This div class name block

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