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CSS ID selector

In some ways, ID selectors are similar to class selectors, but there are some important differences.

Grammar

First, the ID selector is preceded by a # sign-also known as a chessboard sign or pound sign.

Take a look at the following rules:

* # intro {font-weight:bold;}

Like class selectors, wildcard selectors can be ignored in ID selectors. The previous example can also be written:

# intro {font-weight:bold;}

The effect of this selector will be the same.

The second difference is that the ID selector does not refer to the value of the class attribute, and there is no doubt that it refers to the value in the id attribute.

The following is an example of an actual ID selector:

This is a paragraph of introduction.

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