CSS选择器优先级说明_html/css_WEB-ITnose

Some examples:

 *             {}  /* a=0 b=0 c=0 d=0 -> specificity = 0,0,0,0 */ li            {}  /* a=0 b=0 c=0 d=1 -> specificity = 0,0,0,1 */ li:first-line {}  /* a=0 b=0 c=0 d=2 -> specificity = 0,0,0,2 */ ul li         {}  /* a=0 b=0 c=0 d=2 -> specificity = 0,0,0,2 */ ul ol+li      {}  /* a=0 b=0 c=0 d=3 -> specificity = 0,0,0,3 */ h1 + *[rel=up]{}  /* a=0 b=0 c=1 d=1 -> specificity = 0,0,1,1 */ ul ol li.red  {}  /* a=0 b=0 c=1 d=3 -> specificity = 0,0,1,3 */ li.red.level  {}  /* a=0 b=0 c=2 d=1 -> specificity = 0,0,2,1 */ #x34y         {}  /* a=0 b=1 c=0 d=0 -> specificity = 0,1,0,0 */ style=""          /* a=1 b=0 c=0 d=0 -> specificity = 1,0,0,0 */

In the above example, the color of the P element would be green. The declaration in the "style" attribute will override the one in the STYLE element because of cascading rule 3, since it has a higher specificity.