1.nested:默认
#main { color: #fff; background-color: #000; } #main p { width: 10em; }.huge { font-size: 10em; font-weight: bold; text-decoration: underline; }
2.expanded
#main { color: #fff; background-color: #000;}#main p { width: 10em;}.huge { font-size: 10em; font-weight: bold; text-decoration: underline;}
3.compact
#main { color: #fff; background-color: #000; }#main p { width: 10em; }.huge { font-size: 10em; font-weight: bold; text-decoration: underline; }
4.compressed
#main{color:#fff;background-color:#000}#main p{width:10em}.huge{font-size:10em;font-weight:bold;text-decoration:underline}