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Hasty Treat - CSS Nesting 1

Published: April 12, 2021, 1 p.m.

In this Hasty Treat, Scott and Wes talk about CSS nesting \u2014 what it is, when to use it, and why.

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Show Notes

04:22 - What is it?

06:02 - Why nest?

  • Easier to read
  • Easier to write
  • Prevents refactoring errors, allows for dry-er code. No more typing a parent div 100 times, with a possibility of screwing it up.

08:13 - When to use nesting

  • Nesting is often overused
  • Only nest what you would have written un-nested with a short hand (e.g. don\u2019t nest just for the sake of it)
    • .container .item {} .container .item a {}
  • Use it for scoping

10:06 - Nesting prefixes

  • In order to nest CSS, you must first start it with a nesting selector
 .tweet {   & > p {   }   &.media-included { color: green; }   & + .tweet { } // sibling   & p { } // descentang }
  • Component-based \u2014 tweet, card, company, Link
 article{     color: blue;   & {         color: red;   } }

and must be the first child of a compound selector

12:44 - @nest rule / media queries

  • Mostly just a visual way to show nested
 .foo {     display: grid;     @media(orientation: landscape) {     & {             grid-auto-flow: column;         }     } }  
 .foo {   display: grid;    @media (orientation: landscape) {     & {       grid-auto-flow: column;     }      @media (min-inline-size > 1024px) {       & {         max-inline-size: 1024px;       }     }   } } /* equivalent to    .foo { display: grid; }     @media (orientation: landscape) {      .foo {        grid-auto-flow: column;      }    }     @media (orientation: landscape) and (min-inline-size > 1024px) {      .foo {        max-inline-size: 1024px;      }    }  */

16:30 - How to use nesting today

  • Literally any CSS preprocessor
  • PostCSS to use spec
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