How to define the id selector of CSS
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The id resolver can also specify a specific pattern for HTML elements marked with a particular id.
The id determiner is defined by "#".
The above two id resolvers, the first one says that the color of the element is red, and the second defines that the color of the element is green:
# red {color:red;} # green {color:green;}
In the following HTML code, the p element with the id attribute of red appears red, while the p element with the id attribute of green flashes green.
This paragraph is red.
This paragraph is green.
Note: the id attribute can only appear once in each HTML document.
What are the selectors of css? css selectors can be divided into three categories, namely, id selector, class selector and tag selector. There can be many combinations between them, such as descendant selector, sub-selector, pseudo-class selector, general selector, group selector, and so on.
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