margin-top
border
margin-toppadding-topmargin-top
margin-top
border
margin-toppadding-topmargin-top
because there are obvious boundaries, it means you don't want them to merge recommend learning Zhang Xinxu's "CSS World", in which there is a very detailed introduction to the box model, BFC and so on.
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A timing examination system is triggered if the click event is triggered within 5 seconds, and if it is not triggered, the system marks the correct answer at the end of the countdown. How to implement ...
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o ...
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