margin-block-end
The
margin-block-end property in CSS defines the amount of space along the outer ending edge of an element in the block direction. It's included in the CSS Logical Properties Level 1 specification, which is currently in Working Draft. margin-block-start
The
margin-block-start property in CSS defines the amount of space along the outer starting edge of an element in the block direction. It’s included in the CSS Logical Properties Level 1 specification, which is currently in Working Draft. 
Win a Copy of Zell Liew’s Learn JavaScript Course
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Creating websites with prefers-reduced-data
Spoiler alert: There is no support for it yet. But it is defined in the Media Queries Level 5 spec that includes other recent, but more familiar user preference features, like prefers-color-scheme and prefers-reduced-motion.
The Polypane blog goes into …
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