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This article mainly shows you "what are the pseudo elements of css", the content is easy to understand, clear, hope to help you solve your doubts, the following let the editor lead you to study and learn "what are the pseudo elements of css" this article.

Pseudo element

Selector description version commonly used:: before insert before the element 2 √:: after insert after the element 2 √:: first-letter element first letter 1 x:: first-line element 1 x:: selection mouse selected element 3 ×:: backdrop full screen mode element 4 x:: placeholder form element occupies 4 √

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, the selector is usually a HTML element that needs to change the style; 3, each declaration consists of an attribute and a value; 4, attributes and attribute values are separated by colons.

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