According to the W3Schools CSS notes, if you use an ID on an element, then the CSS styles defined for that ID (using #id_name) should only apply to that element, and this is how you should style an element which only appears once.According to the W3Schools CSS notes, if you us
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CSS样式“泄漏”到非预期的元素，它为什么会发生以及如何防止它？
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