How does CSS set the style of the first line of text in an object? The first line of css

How does CSS set the style of the first line of text in an object? The first line of css

How does CSS set the style of the first line of text in an object:
Suggestion: writing code as much as possible can effectively improve learning efficiency and depth.
You may need to set the style of the first line of text in the object. The following is a brief introduction.
Code example:

<! DOCTYPE html>  
The above Code sets the style of the first line of text. The E: first-line attribute is used, which is compatible with all browsers.
 
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