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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-.

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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 Skypack, which makes packages from npm not only available on a CDN, but prepares them for native JavaScript ES6 import usage.

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HTML 

              
                <button id="button" class="accordion">Section 1</button>
<div class="panel">
  <p class="margin-b">Lorem ipsum...</p>
  
                        <div class="svg-line-container svg-desktop svg-line-trigger">
                                <svg width="1220" height="2599" viewBox="0 0 1220 2599">
                                    <path class="theLine" fill="none" stroke-width="1px" d="M1117.5 0C1117.5 96.5 1152.17 148.135 1181 205.5C1279 400.5 1154 520.5 1154 824.5C1154 1052.88 1280.5 1345.5 1051 1480C821.5 1614.5 580 1545.5 399 1510.5C217.999 1475.5 64.8917 1552.82 17.5003 1743C-59 2050 155.684 2219.49 272 2329C468.5 2514 660 2633 800.5 2589.5" stroke="#E3001A" />
                                </svg>
                            </div>
</div>

<button class="accordion">Section 2</button>
<div class="panel">
  <p>Lorem ipsum...</p>
</div>

<button class="accordion">Section 3</button>
<div class="panel">
  <p>Lorem ipsum...</p>
</div>
!

CSS 

              
                /* Style the buttons that are used to open and close the accordion panel */
.accordion {
  background-color: #eee;
  color: #444;
  cursor: pointer;
  padding: 18px;
  width: 100%;
  text-align: left;
  border: none;
  outline: none;
  transition: 0.4s;
}

/* Add a background color to the button if it is clicked on (add the .active class with JS), and when you move the mouse over it (hover) */
.active, .accordion:hover {
  background-color: #ccc;
}

/* Style the accordion panel. Note: hidden by default */
.panel {
  padding: 0 18px;
  background-color: white;
  display: none;
  overflow: hidden;
  height:2000px;
  background-color:beige;
}
!

JS 

              
                var acc = document.getElementsByClassName("accordion");
var i;

for (i = 0; i < acc.length; i++) {
  acc[i].addEventListener("click", function() {
    /* Toggle between adding and removing the "active" class,
    to highlight the button that controls the panel */
    this.classList.toggle("active");

    /* Toggle between hiding and showing the active panel */
    var panel = this.nextElementSibling;
    if (panel.style.display === "block") {
      panel.style.display = "none";
    } else {
      panel.style.display = "block";
    }
  });
}

gsap.registerPlugin(ScrollTrigger, DrawSVGPlugin);

const button = document.getElementById('button');

button.addEventListener('click', svgInit);

function svgInit() {
console.log("init success");
  
  if (button.classList.contains('active')) {
const svgLine = gsap.timeline({
    defaults: {
      duration: 10
    },
    scrollTrigger: {
      id: "svgLine",
      trigger: ".svg-line-trigger",
      scrub: 0.7,
      start: "top center-=30px",
      end: 'bottom center',
      markers: true
    }
  })
  .from(".theLine", {
    drawSVG: 0
  }, 0)
} else {
  svgLine.ScrollTrigger.kill();
}
}
!
999px

Console