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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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Adding Classes

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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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Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.

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HTML 

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

CSS 

              
                // #divtober 01: Badge
// a.singlediv.com/divtober2022

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

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

body
  min-height: 300px
  height: 100vh
  position: relative
  background-color: olive
  text-align: center

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

  &::before,
  &::after
    display: block
    content: ''
    position: absolute
    
  @media (max-width: 400px)
    &:not(.no-scale)
      transform: scale(.8)

#badge
  width: 250px
  height: @width
  margin-left: -(@width/2)
  margin-top: -(@height/2)
  background-color: gold
  background-image: repeating-conic-gradient(black(0) 0%,
                                             black(0) .2%,
                                             black(.3) .21%,
                                             black(.3) .4%,
                                             black(0) .41%,
                                             black(0) .6%)
  border-radius: 50%
  box-shadow: inset 0 -1px 5px 2px black(.4),
              inset 0 0 2px 5px gold,
              0 0 5px 2px black(.1),
              0 6px 3px black(.15),
              0 12px 5px black(.1),
              0 20px 10px black(.06)

  &::before
    width: 90%
    height: @width
    left: ((100% - @width) / 2)
    top: ((100% - @width) / 2)
    box-sizing: border-box
    background: radial-gradient(circle, transparent 71%, goldenrod 71%) 0 0 / 100% 100%,
                radial-gradient(ellipse, white(.1), white(0) 50%) 50% -12% / 80% 40%,
                radial-gradient(ellipse, white(.2), white(0) 50%) 50%  50% / 120% 40%,
                radial-gradient(circle, alpha(indigo,.1) 10%, alpha(indigo,0) 30%) 10% 9.5% / 20% 50%,
                radial-gradient(circle, alpha(indigo,.1) 10%, alpha(indigo,0) 30%) 90% 9.5% / 20% 50%,
                radial-gradient(circle, alpha(indigo,.1) 10%, alpha(indigo,0) 30%) 10% 90.5% / 20% 50%,
                radial-gradient(circle, alpha(indigo,.1) 10%, alpha(indigo,0) 30%) 90% 90.5% / 20% 50%,
                repeating-linear-gradient(45deg, black(0), black(0) .4%,
                                                           black(.2) .6%,
                                                           black(.2) .9%,
                                                           black(0) 1.1%) 0 0 / 100% 100%,
                radial-gradient(circle, mediumslateblue 71%, transparent 71%) 0 0 / 100% 100%
    background-color: goldenrod
    background-repeat: no-repeat
    border: 3px dotted black(.4)
    border-radius: 50%
    box-shadow: 0 0 6px 1px black(.6),
                inset 0 3px 4px black(.2),
                inset 0 0 4px 4px black(.1),
                inset 0 -60px 40px -50px black(.2)

  &::after
    width: 60%
    height: 40%
    left: ((100% - @width) / 2)
    top: ((100% - @height) / 2)

    background: linear-gradient(to right, firebrick, tomato, firebrick)          6px  6px / 4px 1px,
                linear-gradient(to right, firebrick, tomato)                     5px  7px / 6px 1px,
                linear-gradient(to right, firebrick, tomato, tomato, firebrick)  4px  8px / 8px 1px,
                linear-gradient(to right, firebrick, tomato, firebrick)          4px  9px / 8px 1px,
                linear-gradient(to right, firebrick, tomato, firebrick)          4px 10px / 8px 1px,
                linear-gradient(to right, firebrick, tomato, tomato, firebrick)  5px 11px / 6px 1px,
                linear-gradient(to right, firebrick, firebrick)                  6px 12px / 4px 1px,
                linear-gradient(to right, white(.4), white(.4))                  6px 13px / 4px 1px,
                linear-gradient(to right, goldenrod, gold, goldenrod)           17px  6px / 4px 1px,
                linear-gradient(to right, goldenrod, gold)                      16px  7px / 6px 1px,
                linear-gradient(to right, goldenrod, gold, gold, goldenrod)     15px  8px / 8px 1px,
                linear-gradient(to right, goldenrod, gold, goldenrod)           15px  9px / 8px 1px,
                linear-gradient(to right, goldenrod, gold, goldenrod)           15px 10px / 8px 1px,
                linear-gradient(to right, goldenrod, gold, gold, goldenrod)     16px 11px / 6px 1px,
                linear-gradient(to right, goldenrod, goldenrod)                 17px 12px / 4px 1px,
                linear-gradient(to right, white(.4), white(.4))                 17px 13px / 4px 1px,
                linear-gradient(to right, green, limegreen, green)              28px  6px / 4px 1px,
                linear-gradient(to right, green, limegreen)                     27px  7px / 6px 1px,
                linear-gradient(to right, green, limegreen, limegreen, green)   26px  8px / 8px 1px,
                linear-gradient(to right, green, limegreen, green)              26px  9px / 8px 1px,
                linear-gradient(to right, green, limegreen, green)              26px 10px / 8px 1px,
                linear-gradient(to right, green, limegreen, limegreen, green)   27px 11px / 6px 1px,
                linear-gradient(to right, green, green)                         28px 12px / 4px 1px,
                linear-gradient(to right, white(.4), white(.4))                 28px 13px / 4px 1px,
                linear-gradient(to right, green, lawngreen, green)             5px 26px / 4px 1px,
                linear-gradient(to right, green, lawngreen, lawngreen, green)  6px 27px / 4px 1px,
                linear-gradient(to right, green, lawngreen, green)             7px 28px / 4px 1px,
                linear-gradient(to right, green, lawngreen, green)             8px 29px / 4px 1px,
                linear-gradient(to right, green, lawngreen, lawngreen, green)  7px 30px / 4px 1px,
                linear-gradient(to right, green, lawngreen, green)             6px 31px / 4px 1px,
                linear-gradient(to right, green, lawngreen, green)             5px 32px / 4px 1px,
                linear-gradient(to right, green, lawngreen, green)            14px 31px / 7px 1px,
                linear-gradient(to right, green, lawngreen, green)            14px 32px / 7px 1px,
                radial-gradient(ellipse, white(.5), white(0) 60%) 100% 0% / 80% 10%,
                radial-gradient(ellipse, white(.05) 40%, white(0) 60%) 80% 22% / 80% 10%,
                repeating-linear-gradient(to bottom, white(.1),
                                                     white(.1) 3%,
                                                     white(0) 10%,
                                                     black(0) 10%,
                                                     black(.15) 20%) 0 0 / 100% 100%,
                repeating-linear-gradient(to right, black(.2), black(.2) 1%,
                                                                black(0) 1%,
                                                                black(0) 2%) 0 0 / 100% 100%,
                linear-gradient(to bottom, #ccc, #ccc) 0 0 / 100% 20%,
                linear-gradient(to bottom, #444, #444) 0 100% / 100% 80%
    background-repeat: no-repeat
    border-radius: 5px
    box-shadow: 0 -2px 0 white(.2),
                0 -8px 4px black(.06),
                -2px 0 3px black(.06),
                 2px 0 3px black(.06),
                -3px 0 1px -2px white(.2),
                3px 0 1px -2px white(.2),
                0 3px 3px -2px white(.3)
!

JS 

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

Console