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HTML

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Adding Classes

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Insecure Resource

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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

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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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Using packages here is powered by esm.sh, which makes packages from npm not only available on a CDN, but prepares them for native JavaScript ESM usage.

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HTML 

              
                <svg id="wrap" width="300" height="300">
  
  <!-- background -->
  <svg>
    <circle cx="150" cy="150" r="130" style="stroke: lightblue; stroke-width:18; fill:transparent"/>
    <circle cx="150" cy="150" r="115" style="fill:#2c3e50"/>
    <path style="stroke: #2c3e50; stroke-dasharray:820; stroke-dashoffset:820; stroke-width:18; fill:transparent" d="M150,150 m0,-130 a 130,130 0 0,1 0,260 a 130,130 0 0,1 0,-260">
      <animate attributeName="stroke-dashoffset" dur="6s" to="-820" repeatCount="indefinite"/>
    </path>
  </svg>
  
  <!-- image -->
  <svg>
    <path id="hourglass" d="M150,150 C60,85 240,85 150,150 C60,215 240,215 150,150 Z" style="stroke: white; stroke-width:5; fill:white;" />
    
    <path id="frame" d="M100,97 L200, 97 M100,203 L200,203 M110,97 L110,142 M110,158 L110,200 M190,97 L190,142 M190,158 L190,200 M110,150 L110,150 M190,150 L190,150" style="stroke:lightblue; stroke-width:6; stroke-linecap:round" />
    
    <animateTransform xlink:href="#frame" attributeName="transform" type="rotate" begin="0s" dur="3s" values="0 150 150; 0 150 150; 180 150 150" keyTimes="0; 0.8; 1" repeatCount="indefinite" />
    <animateTransform xlink:href="#hourglass" attributeName="transform" type="rotate" begin="0s" dur="3s" values="0 150 150; 0 150 150; 180 150 150" keyTimes="0; 0.8; 1" repeatCount="indefinite" />
  </svg>
  
  <!-- sand -->
  <svg>
    <!-- upper part -->
    <polygon id="upper" points="120,125 180,125 150,147" style="fill:#2c3e50;">
      <animate attributeName="points" dur="3s" keyTimes="0; 0.8; 1" values="120,125 180,125 150,147; 150,150 150,150 150,150; 150,150 150,150 150,150" repeatCount="indefinite"/>
    </polygon>
    
    <!-- falling sand -->
    <path id="line" stroke-linecap="round" stroke-dasharray="1,4" stroke-dashoffset="200.00" stroke="#2c3e50" stroke-width="2" d="M150,150 L150,198">
      <!-- running sand -->
      <animate attributeName="stroke-dashoffset" dur="3s" to="1.00" repeatCount="indefinite"/>
      <!-- emptied upper -->
      <animate attributeName="d" dur="3s" to="M150,195 L150,195" values="M150,150 L150,198; M150,150 L150,198; M150,198 L150,198; M150,195 L150,195" keyTimes="0; 0.65; 0.9; 1" repeatCount="indefinite"/>
      <!-- last drop -->
      <animate attributeName="stroke" dur="3s" keyTimes="0; 0.65; 0.8; 1" values="#2c3e50;#2c3e50;transparent;transparent" to="transparent" repeatCount="indefinite"/>
    </path>
    
    <!-- lower part -->
    <g id="lower">
      <path d="M150,180 L180,190 A28,10 0 1,1 120,190 L150,180 Z" style="stroke: transparent; stroke-width:5; fill:#2c3e50;">
        <animateTransform attributeName="transform" type="translate" keyTimes="0; 0.65; 1" values="0 15; 0 0; 0 0" dur="3s" repeatCount="indefinite" />
      </path>
      <animateTransform xlink:href="#lower" attributeName="transform"
                    type="rotate"
                    begin="0s" dur="3s"
                    values="0 150 150; 0 150 150; 180 150 150"
                    keyTimes="0; 0.8; 1"
                    repeatCount="indefinite"/>
    </g>
    
    <!-- lower overlay - hourglass -->
    <path d="M150,150 C60,85 240,85 150,150 C60,215 240,215 150,150 Z" style="stroke: white; stroke-width:5; fill:transparent;">
      <animateTransform attributeName="transform"
                    type="rotate"
                    begin="0s" dur="3s"
                    values="0 150 150; 0 150 150; 180 150 150"
                    keyTimes="0; 0.8; 1"
                    repeatCount="indefinite"/>
    </path>
    
    <!-- lower overlay - frame -->
    <path id="frame" d="M100,97 L200, 97 M100,203 L200,203" style="stroke:lightblue; stroke-width:6; stroke-linecap:round">
      <animateTransform attributeName="transform"
                    type="rotate"
                    begin="0s" dur="3s"
                    values="0 150 150; 0 150 150; 180 150 150"
                    keyTimes="0; 0.8; 1"
                    repeatCount="indefinite"/>
    </path>
  </svg>
  
</svg>
!

CSS 

              
                @import "nib"

body
  background #e5e5e5
  
#wrap
  position: absolute
  top 0
  bottom 0
  left 0
  right 0
  margin auto
!

JS
!
999px

Console