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HTML

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HTML preprocessors can make writing HTML more powerful or convenient. For instance, Markdown is designed to be easier to write and read for text documents and you could write a loop in Pug.

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About the <head>

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CSS

About CSS Preprocessors

CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

Vendor Prefixing

About Vendor Prefixing

To get the best cross-browser support, it is a common practice to apply vendor prefixes to CSS properties and values that require them to work. For instance -webkit- or -moz-.

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JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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Packages

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HTML 

              
                <div id="pop"></div>
!

CSS 

              
                // #divtober 23: Pop
// a.singlediv.com/divtober2022

black(alpha)
  rgba(0,0,0,alpha)

white(alpha)
  rgba(255,255,255,alpha)

body
  min-height: 400px
  height: 100vh
  position: relative
  background-color: white

div
  position: absolute
  left: 50%
  top: 50%

  &::before,
  &::after
    display: block
    content: ''
    position: absolute

#pop
  width: 100%
  height: 100%
  left: 0
  top: 0
  background: radial-gradient(ellipse, black 60%,
                                       black(0) 60.5%) calc(50% + 1em) calc(50% + 6em) / 12em 4.8em no-repeat,
              linear-gradient(white, white) 0 100% / 50% calc(50% - 4.25em) no-repeat,
              radial-gradient(black 40%, black(0) 40.5%)   0em calc(50% + 2.9em) / .5em .5em repeat-x,
              radial-gradient(black 40%, black(0) 40.5%) .25em calc(50% + 3.2em) / .5em .5em repeat-x,
              radial-gradient(black 40%, black(0) 40.5%)   0em calc(50% + 3.5em) / .5em .5em repeat-x,
              radial-gradient(black 40%, black(0) 40.5%) .25em calc(50% + 3.8em) / .5em .5em repeat-x,
              radial-gradient(black 40%, black(0) 40.5%)   0em calc(50% + 4.1em) / .5em .5em repeat-x,
              radial-gradient(black 40%, black(0) 40.5%) .25em calc(50% + 4.4em) / .5em .5em repeat-x,
              radial-gradient(black 40%, black(0) 40.5%)   0em calc(50% + 4.7em) / .5em .5em repeat-x,
              radial-gradient(black 40%, black(0) 40.5%) .25em calc(50% + 5.0em) / .5em .5em repeat-x,
              radial-gradient(black 40%, black(0) 40.5%)   0em calc(50% + 5.3em) / .5em .5em repeat-x,
              radial-gradient(black 40%, black(0) 40.5%) .25em calc(50% + 5.6em) / .5em .5em repeat-x,
              radial-gradient(black 40%, black(0) 40.5%)   0em calc(50% + 5.9em) / .5em .5em repeat-x,
              linear-gradient(to bottom, black .3em, white .3em) 50% 100% / 100% calc(50% - 2.5em) no-repeat
  background-color: gold

  &::before
    width: 8em
    height: 15em
    left: 50%
    top: 50%
    margin-left: -(@width/2)
    margin-top: -(@height/2)
    background: linear-gradient(black, black) 70% 0 / .3em 30%,
                linear-gradient(black, black) 80% 0 / .3em 30%,
                linear-gradient(black, black) 76% 28.6% / 10% .3em,
                linear-gradient(gold, gold) 76% 0 / 10% 1em,
                radial-gradient(ellipse at 50% 100%, white(0) 50%,
                                                     white 50.5%) 50% 1.7% / 132% 8.5%,
                radial-gradient(ellipse, gold 70%, alpha(gold,0) 71%) 50% 1% / 95% 15%,
                radial-gradient(ellipse, black 70%, black(0) 71%) 50% 1% / 100% 17%,
                linear-gradient(gold, gold) 76% 20% / 10% 1.5em,
                radial-gradient(ellipse, maroon 70%, alpha(maroon,0) 71%) 50% 25.2% / 93% 16.5%,
                radial-gradient(ellipse, black 70%, black(0) 71%) 50% 24% / 100% 20%,
                linear-gradient(white, white) 24% 100% / 20% 70%,
                linear-gradient(white, white) 90% 100% / 10% 70%,
                radial-gradient(circle, white(0) 34%, white 34.5%,
                                        white 60%, white(0) 60.5%) 7% 57% / .6em .6em,
                radial-gradient(circle, white(0) 34%, white 34.5%,
                                        white 50%, white(0) 50.5%) 54% 50% / 1.3em 1.3em,
                radial-gradient(circle, white(0) 34%, white 34.5%,
                                        white 60%, white(0) 60.5%) 68% 67% / .6em .6em,
                radial-gradient(circle, white(0) 34%, white 34.5%,
                                        white 60%, white(0) 60.5%) 50% 77% / .6em .6em,
                linear-gradient(black, black) 65% 70% / .3em 60%,
                linear-gradient(black, black) 75% 70% / .3em 60%,
                linear-gradient(black, black) 71% 87.7% / 10% .3em,
                linear-gradient(maroon, maroon) 71% 80% / 10% 1em,
                radial-gradient(ellipse, maroon 70%, alpha(maroon,0) 71%) 50% 98.8% / 95% 22%,
                radial-gradient(ellipse, black 70%, black(0) 71%) 50% 99% / 100% 24%,
                linear-gradient(maroon,maroon) 50% 100% / 100% 70%
    background-color: gold
    background-repeat: no-repeat
    border-top-left-radius: 50% 10%
    border-top-right-radius: 50% 10%
    border-bottom-right-radius: 50% 15%
    border-bottom-left-radius: 50% 15%
    box-shadow: inset 0 0 0 .3em black,
                inset 0 -.5em 0 white

  &::after
    width: 4em
    height: 2em
    left: 50%
    top: 50%
    margin-left: 2.16em
    margin-top: -8.5em
    border-top-left-radius: .4em
    border-left: .3em solid black
    border-top: .3em solid black
    box-shadow: -.48em -.5em 0 gold,
                -.48em -.3em 0 gold,
                -.25em -.5em 0 gold,
                -.55em -.55em 0 .2em black,
                -.2em -.55em 0 .2em black
!

JS 

              
                // @lynnandtonic
// a.singlediv.com
!
999px

Console