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HTML

About HTML Preprocessors

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

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. So you don't have access to higher-up elements like the <html> tag. If you want to add classes there that can affect the whole document, this is the place to do it.

About the <head>

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. If you need things in the <head> of the document, put that code here.

!
Insecure Resource

The resource you are linking to is using the 'http' protocol, which may not work when the browser is using https.

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).

Add External Stylesheets/Pens

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You can apply CSS to your Pen from any stylesheet on the web. Just put a URL to it here and we'll apply it, in the order you have them, before the CSS in the Pen itself.

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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.

Add External Scripts/Pens

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You can apply a script from anywhere on the web to your Pen. Just put a URL to it here and we'll add it, in the order you have them, before the JavaScript in the Pen itself.

If the script you link to has the file extension of a preprocessor, we'll attempt to process it before applying.

You can also link to another Pen here, and we'll pull the JavaScript from that Pen and include it. If it's using a matching preprocessor, we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.

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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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About Packages

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.

If you're using React / ReactDOM, make sure to turn on Babel for the JSX processing.

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HTML 

              
                <p>
  Lorem ipsum dolor sit amet consectetur adipisicing elit. Praesentium nesciunt assumenda dolor delectus aliquam totam distinctio suscipit, fuga quisquam, doloribus accusantium labore corporis id? Laboriosam magni aliquid voluptas beatae qui.
  <span class="word">
    <svg viewBox="0 0 531 179" preserveAspectRatio="none" fill="none" xmlns="http://www.w3.org/2000/svg">
      <path 
            vector-effect="non-scaling-stroke"
             stroke="black" stroke-width="3" stroke-linecap="round"
            d="M315.333 2.33333C288.408 2.33333 261.339 1.52882 234.444 2.92592C195.666 4.9404 157.564 13.4934 119.63 21.2963C81.9204 29.0529 42.329 38.4141 11.5556 62.8518C-14.3588 83.4309 19.8012 105.623 37.4815 117.889C141.065 189.75 268.801 186.295 386.593 157.296C431.025 146.358 474.238 134.354 515.333 114.037C519.084 112.183 526.071 110.242 528.37 106.333C531.453 101.092 519.527 97.1621 516.148 95.5185C490.91 83.2405 463.893 82.6555 436.519 79.5926C402.673 75.8057 369.665 73.3793 335.481 73.0741C313.84 72.8808 293.006 73.2943 271.556 75.5926C265.704 76.2196 259.844 78.3333 254 78.3333" />
    </svg>
    non scaling stroke
  </span>
  Lorem ipsum dolor sit amet consectetur adipisicing elit.
  <span class="word">
    <svg viewBox="0 0 531 179" preserveAspectRatio="none" fill="none" xmlns="http://www.w3.org/2000/svg">
      <path 
            vector-effect="none" 
             stroke="black" stroke-width="10" stroke-linecap="round"
            d="M315.333 2.33333C288.408 2.33333 261.339 1.52882 234.444 2.92592C195.666 4.9404 157.564 13.4934 119.63 21.2963C81.9204 29.0529 42.329 38.4141 11.5556 62.8518C-14.3588 83.4309 19.8012 105.623 37.4815 117.889C141.065 189.75 268.801 186.295 386.593 157.296C431.025 146.358 474.238 134.354 515.333 114.037C519.084 112.183 526.071 110.242 528.37 106.333C531.453 101.092 519.527 97.1621 516.148 95.5185C490.91 83.2405 463.893 82.6555 436.519 79.5926C402.673 75.8057 369.665 73.3793 335.481 73.0741C313.84 72.8808 293.006 73.2943 271.556 75.5926C265.704 76.2196 259.844 78.3333 254 78.3333"  />
    </svg>
   scaling stroke
  </span>
  Magnam dolorem officia mollitia inventore nesciunt hic earum deserunt vel rem quas, iste aliquam nam eum expedita ad eos veniam illo doloribus?
</p>
!

CSS 

              
                .word {
  display: inline-block;
  position: relative;
  svg {
    position: absolute;
    width: 100%;
    height: 100%;
  }
}

p {
  font-size: 4vw;
}
.word {
  color: red;
  &:last-child{ 
  color: green;
  }
}
!

JS 

              
                gsap.from('path', {drawSVG:"0%", duration:2})
!
999px

Console