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In this article, the editor introduces in detail what the CSS rules are made of. The content is detailed, the steps are clear, and the details are handled properly. I hope this article "what constitutes the CSS rules" can help you solve your doubts.

A CSS rule consists of two main parts: a selector and one or more declarations.

Selector {declaration1; declaration2;... DeclarationN}

Selectors are usually HTML elements that you need to change the style.

Each declaration consists of an attribute and a value.

Property is the style property you want to set (style attribute). Each property has a value. Properties and values are separated by colons.

Selector {property: value}

The following line of code defines the text color within the H2 element as red and sets the font size to 14 pixels.

In this example, H2 is the selector, color and font-size are properties, and red and 14px are values.

After reading this, the article "what is the composition of CSS rules" has been introduced. If you want to master the knowledge points of this article, you still need to practice and use it yourself to understand it. If you want to know more about related articles, welcome to follow the industry information channel.

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