-moz-background-clip:border; -moz-background-inline-policy:continuous; -moz-background-origin:padding;
……等样式框.为什么这样做？
解决方法
由于您在Firebug设置中选中了“显示用户代理CSS”,因此Firebug会显示这些规则.
来自Mozilla开发人员参考：
In Gecko-based applications like Firefox the
-moz-background-clipCSS property specifies whether an element’s background,either the color or image,extends underneath its borderborder: (initial) The background extends to the outside edge of the border (but underneath the border in z-ordering).
padding: No background is drawn below the border (background extends to the outside edge of the padding).
In Gecko-based applications like Firefox,the
-moz-background-inline-policyCSS property specifies how the background image of an inline element is determined when the content of the inline element wraps onto multiple lines. The choice of position has significant effects on repetition.bounding-Box: The background image is positioned (and repeated) in the smallest rectangle that contains all of the inline Boxes for the element. It is then clipped to be visible only within those Boxes,according to the
-moz-background-clipproperty.continuous: (Initial) The background image is positioned (and repeated) as if the inline Box were not broken across lines,and then this long rectangle is sliced into pieces for each line.
each-Box: The background image is positioned (and repeated) separately for each Box of the inline element. This means that an image with
background-repeat : no-repeatmay be repeated multiple times.
In Mozilla applications like Firefox,the
-moz-background-originCSS property determines the background positioning area (the origin of a background-image).border: The background position is relative to the border,so the image can go behind the border.
padding: (Initial) The background position is relative to the padding.
content: The background position is relative to the content.
