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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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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

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-.

We offer two popular choices: Autoprefixer (which processes your CSS server-side) and -prefix-free (which applies prefixes via a script, client-side).

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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

Add Packages

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.

All packages are different, so refer to their docs for how they work.

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HTML 

              
                <div id="plot" style="width: 50%"></div>
!

CSS 

              
                #plot .modebar {
  background: orange;
}

#plot .clicked path {
  fill: rgba(0, 0, 0, 1);
}
!

JS 

              
                let data = {
  x: [0, 1, 2, 3, 4],
  y: [-1, 5, 2, 3, 3]
}

let layout = {
  xaxis: {
    range: [-1, 5]
  }
}

let lockIcon = {
  'width': 1000,
  'height': 1000,
  'path': "M320 768h512v192q0 106 -75 181t-181 75t-181 -75t-75 -181v-192zM1152 672v-576q0 -40 -28 -68t-68 -28h-960q-40 0 -68 28t-28 68v576q0 40 28 68t68 28h32v192q0 184 132 316t316 132t316 -132t132 -316v-192h32q40 0 68 -28t28 -68z",
  'transform': 'matrix(0.75 0 0 -0.75 0 1000)'
}

let lockBtnState = false;
let modeBarButtons = [[
  {
    name: 'Custom Lock',
    icon: lockIcon,
    click: () => { 
      alert('clicked custom button!'); 
      lockBtnState = !lockBtnState;
      let btns = document.getElementsByClassName('modebar-btn');
      for (let i = 0; i < btns.length; i++) {
        if (btns[i].getAttribute('data-title') === 'Custom Lock') {
          if (lockBtnState) {
            btns[i].classList.add('clicked');
          } else {
            btns[i].classList.remove('clicked');
          }
        }
      }
    }
  },
  { 
    name: 'Snapshot',
    icon: Plotly.Icons.camera,
    click: () => { alert('new button!'); }
  }, "zoom2d", "pan2d" ]];

Plotly.react('plot', [data], layout, { modeBarButtons: modeBarButtons });
!
999px

Console