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Negation and empty pseudo-classes
Mozilla Developer Network
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The "Negation and empty pseudo-classes" Lesson is part of the full, CSS3 In-Depth course featured in this preview video. Here's what you'd learn in this lesson:
The negation pseudo-class can add exclusion to a CSS rule. The empty pseudo-class, used more rarely, will match any element that doesn’t contain any content or whose content is only an HTML comment.
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