'background-position'
Value: [ [ <percentage> | <length> | left | center | right ] [ <percentage> | <length> | top | center | bottom ]? ] | [ [ left | center | right ] || [ top | center | bottom ] ] | inherit
Initial: 0% 0%
Applies to: all elements
Inherited: no
Percentages: refer to the size of the box itself
Media: visual
Computed value: for <length> the absolute value, otherwise a percentage
If a background image has been specified, this property specifies its initial position. If only one value is specified, the second value is assumed to be 'center'. If at least one value is not a keyword, then the first value represents the horizontal position and the second represents the vertical position. Negative <percentage> and <length> values are allowed.
<percentage>
A percentage X aligns the point X% across (for horizontal) or down (for vertical) the image with the point X% across (for horizontal) or down (for vertical) the element's padding box. For example, with a value pair of '0% 0%',the upper left corner of the image is aligned with the upper left corner of the padding box. A value pair of '100% 100%' places the lower right corner of the image in the lower right corner of the padding box. With a value pair of '14% 84%', the point 14% across and 84% down the image is to be placed at the point 14% across and 84% down the padding box.
<length>
A length L aligns the top left corner of the image a distance L to the right of (for horizontal) or below (for vertical) the top left corner of the element's padding box. For example, with a value pair of '2cm 1cm', the upper left corner of the image is placed 2cm to the right and 1cm below the upper left corner of the padding box.
top
Equivalent to '0%' for the vertical position.
right
Equivalent to '100%' for the horizontal position.
bottom
Equivalent to '100%' for the vertical position.
left
Equivalent to '0%' for the horizontal position.
【 在 darlingpeng (好同志式的坏同志) 的大作中提到: 】
: 我看了background-position的说明，好像不行啊．
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