code is as follows:  


<Style type="text/CSS" >
div. Ui_infor p {the font - size: 16 px; P {}
ui_infor the font - size: 14 px; }
</style>

  code is as follows:  


<Div class="ui_infor >"
<P> The test of css

</div>

example above, the final show effect is the font - size: 16 px, not behind the font - size: 14 px;
the combination of the selector has a quick way to judge:
0,0,0,0
the first value is written in the style of the label, such as

  code is as follows:  


<P style="font - size: 14 px;" ></p>

the second number represents the id selector, such as # demo {}
the third value is representative: name of the class (. Demo {}) or pseudo-classes (the: hover) or attribute selectors [throughout rel=&; xx”]
the fourth number is: tag selector p {}
now to practice with the first example:

  code is as follows:  


div. Ui_infor p {the font - size: 16 px; }

the weight of it is: 0, 2

  code is as follows:  


ui_infor p {the font - size: 14 px; }

the weight of it is: 0,0,1,1
result: 0, 2 >0,0,1,1, so show the font - size: 16 px;
added!!! Important weight was the highest, so need not to judge, but in Internet explorer 6 browser midpoint BUG.
example:

  code is as follows:  


p {the font - size: 18 px! Important; The font - size: 12 px; }

in Internet explorer 6 browser, is to display the font - size: 12 px, said some information online - IE 6 is not supported! Important, in fact is not right.
we are look at the example:

  code is as follows:  


p {the font - size: 18 px! Important; P {}
the font - size: 12 px; }

is to display the font in Internet explorer - 6 - size: 18 px, which explains - IE 6 is to support! Important, but the performance is a bit weird, strange place is: written in the style of a peer of the same name! Important attribute is the back of the cover,
as p {the font - size: 18 px! Important; The font - size: 12 px; } this example, the font - size: 12 px covers the font - size: 18 px! Important.
use this weird, can in Internet explorer - 6, do not use CSS_hack, implementation &other; Min - height”

  code is as follows:  


p {min - height: 50 px; Height: auto!!! Important; Height: 50 px; }
# 0 - #


This concludes the body part