Pseudo-elements let you style specific parts of elements without extra markup. Here's how to use them.
Basic Syntax
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::before and ::after Basics
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Decorative Elements
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Shapes and Icons
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Overlays and Effects
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Text Effects
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Labels and Badges
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Clearfix and Layout
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Custom List Markers
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Form Enhancements
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Best Practices
Usage:
✓ Use for decorative elements
✓ Always include content property
✓ Use position: relative on parent
✓ Prefer double colon syntax
Performance:
✓ Keep pseudo-elements simple
✓ Use transform for animations
✓ Avoid excessive nesting
✓ Test on mobile devices
Accessibility:
✓ Don't use for important content
✓ Decorative content only
✓ Screen readers may ignore
✓ Ensure color contrast
Avoid:
✗ Critical content in ::before/::after
✗ Overusing for everything
✗ Complex layouts with pseudo-elements
✗ Replacing semantic HTML
Conclusion
CSS pseudo-elements enable powerful styling without additional markup. Use ::before and ::after for decorations, icons, and effects. Remember that content property is required, and pseudo-element content is not accessible to screen readers. Use them for visual enhancements, not critical content.