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This article mainly introduces the use of css statement grouping, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor take you to understand it.

Because background is not a legal value for color, and because only one keyword can be specified for color, the user agent completely ignores this color declaration (including the background: black section). In this way, the H2 title will only be displayed in blue, without a red background, but it is more likely that you will not get a blue H2 at all. Instead, these headings only appear in the default color (usually black) and have no background color at all. Font: the 28px Verdana declaration still works because it does end correctly with a semicolon.

Like selector grouping, declaring grouping is a convenient way to shorten stylesheets, make them clearer, and easier to maintain.

Tip: it is a good habit to add a semicolon after the last declaration of the rule. When adding another declaration to a rule, you don't have to worry about inserting another semicolon.

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