CSS Optimization: Is Using Declarations Just Once (UDJO) Still Effective Today?

Is the technique inspired by the DRY principle by identifying and reducing (if not eliminating) CSS declaration repetition still a relevant optimization strategy?

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CSS Optimization: Is Using Declarations Just Once (UDJO) Still Effective Today? originally handwritten and published with love on CSS-Tricks. You should really get the newsletter as well.

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Clear today!

With a high of F and a low of 33F. Currently, it's 45F and Clear outside.

Current wind speeds: 3 from the East

Pollen: 3

Sunrise: November 9, 2026 at 07:28PM

Sunset: November 10, 2026 at 05:42AM

UV index: 0

Humidity: 60%

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November 10, 2026 at 10:02AM

CSS-Tricks, Version 20

Things look a little different around here? I hope so because we just pushed a site redesign! Here's everything new with the 20th(!!) version of CSS-Tricks.

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CSS-Tricks, Version 20 originally handwritten and published with love on CSS-Tricks. You should really get the newsletter as well.

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Clear today!

With a high of F and a low of 37F. Currently, it's 42F and Clear outside.

Current wind speeds: 11 from the Southwest

Pollen: 3

Sunrise: November 8, 2026 at 07:27PM

Sunset: November 9, 2026 at 05:43AM

UV index: 0

Humidity: 72%

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November 9, 2026 at 10:02AM

Partly Cloudy today!

With a high of F and a low of 34F. Currently, it's 39F and Clear outside.

Current wind speeds: 6 from the Northwest

Pollen: 3

Sunrise: November 7, 2026 at 07:26PM

Sunset: November 8, 2026 at 05:43AM

UV index: 0

Humidity: 69%

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November 8, 2026 at 10:02AM

Clear today!

With a high of F and a low of 33F. Currently, it's 38F and Clear outside.

Current wind speeds: 8 from the Southwest

Pollen: 3

Sunrise: November 6, 2026 at 07:25PM

Sunset: November 7, 2026 at 05:45AM

UV index: 0

Humidity: 76%

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November 7, 2026 at 10:02AM

RSS Club: CSS-Tricks Redesign Preview

Hey you wonderful RSS subscribers! We just soft-pushed a site redesign and wanted to give ya'll the first heads-up. A full write-up is coming but here are the high-level details.

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RSS Club: CSS-Tricks Redesign Preview originally handwritten and published with love on CSS-Tricks. You should really get the newsletter as well.

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