What is the method of using the determiner of CSS

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One determiner, multiple uses

Even if an element marked as sidebar can only be rendered once in a document, this id resolver will be used frequently as a derived determiner:

# sidebar p {font-style: italic; text-align: right; margin-top: 0.5em;} # sidebar h3 {font-size: 1em; font-weight: normal; font-style: italic; margin: 0; line-height: 1.5; text-align: right;}

Here, what is obviously different from the rest of the p element on the page is that the p element in sidebar has obtained extraordinary treatment, at the same time, what is obviously different from all the other h3 elements in the page is that the h3 element in sidebar has also been dealt with in a consistent manner.

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