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EQuery E: a multi-element selector that matches both e and E elements at the same level.

E F: descendant selector, usually only if there is an inclusion relationship between elements, you can select all elements under the e element.

E > E: child element selector, which can only select child elements next to the e element.

ESelector: a sibling selector that matches the sibling E element that is equal to the status of e.

What is the basic syntax of css? the basic syntax of css is:

1. The css rule consists of a selector and one or more declarations.

2. Selectors are usually HTML elements that need to be styled

3. Each declaration consists of an attribute and a value

4. Attributes and attribute values are separated by colons.

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