1.http://www.w3schools.com/css/css_howto.asp
Cascading order
Note: If the link to the external style sheet is placed after the internal style sheet in HTML <head>, the external style sheet will override the internal style sheet!
2.http://www.w3schools.com/css/css_font.asp
Set Font Size With Em
The size can be calculated from pixels to em using this formula: pixels/16=em
Use a Combination of Percent and Em
The solution that works in all browsers, is to set a default font-size in percent for the body element:
Example
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http://www.w3schools.com/css/tryit.asp?filename=trycss_table_border-collapse
4.http://www.w3schools.com/css/css_list.asp
Crossbrowser Solution
The following example displays the image-marker equally in all browsers:
Example
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生涯競爭力 (16)