CSS succession of in-depth analysis (2)
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In CSS, the succession is a very unnatural act, we do not even need to consider whether this can be done, but also inherit their limitations.
First, some properties are not inherited. This is not for any reason, just because it is so set, the standard that is the reality. For example: Border attribute, we all know that border attribute set Element is the role of the border, it did not have inheritance. If the borders inherited property, the documents look will be very strange. For example, we have defined the borders containers div 1 px, in which the containers ul li under normal circumstances we do not want to frame it, if a succession of border, we would have to remove their borders. This is obviously unreasonable.
Most of the frame attributes, such as: Border (Borders), Padding (fill white), Margin (border), Background and so on, are not inherited nature.
At certain times of succession will cause some errors, for instance, the following definitions of the CSS:
body (color: blue)
This is the definition of the Color of the text in the Body of blue. If Body contains forms, in some browsers in addition to this form of definition will become the text of the blue, and the internal form of text color is not blue. Technically, this is not true, but it does exist. Therefore, we often need the help of certain skills, such as css will be defined as such:
Body, table, th, td (color: blue)
This form will become the text of the blue.
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