CSS: Position Introduction.

brief introduction:

detailed introduction:

①absolute locate：http://www.runoob.com/try/try.php?filename=trycss_position_absolute

②fixed locate：http://www.runoob.com/try/try.php?filename=trycss_position_fixed

③relative locate：http://www.runoob.com/try/try.php?filename=trycss_position_relative

                             http://www.runoob.com/try/try.php?filename=trycss_position_relative2

④static locate：http://www.runoob.com/try/try.php?filename=trycss_position_static

⑤sticky locate：http://www.runoob.com/try/try.php?filename=trycss_position_sticky

⑥inherit locate：继承

⑦initial locate：初始化为默认值

# Overlapping elements（重叠的元素）using z-index to solute：http://www.runoob.com/try/try.php?filename=trycss_zindex