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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

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).

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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>
  
  <article>
    <h1>List of Current NBA Teams</h1>
    <p>
      There are 30 teams in the NBA and they are divided equally with 15 teams into different conferences. Each conference is made up of three divisions with five teams in each group. Check out the list below to locate your favorite NBA team to bet on when basketball season is underway.
    </p>
    <p>
      Each NBA team has fifteen players. Twelve players are considered part of the active roster and can dress out to play in a game. The other three are inactive or in reserve. Five players play per team at a time. There aren't any special positions by rule in the NBA. Positions are more through different roles played on the court as set up by the coach.
    </p>
    <strong class="label"><span>&#8675;</span>Scroll Down to See the List<span>&#8675;</span></strong>
  </article>
  
  <section>
    <h2 class="first">
      <span class="title">
        <span>
          Eastern Conference
        </span>
      </span>
    </h2>

    <section>
      <h3>
        <span class="title">
          <span>
            Atlantic Division
          </span>
        </span>
      </h3>
      <ul>
        <li>Boston Celtics</li>
        <li>Brooklyn Nets</li>
        <li>New York Knicks</li>
        <li>Philadelphia 76ers</li>
        <li>Toronto Raptors</li>
      </ul>
    </section>

    <section>
      <h3>
        <span class="title">
          <span>
            Central Division
          </span>
        </span>
      </h3>
      <ul>
        <li>Chicago Bulls</li>
        <li>Cleveland Cavaliers</li>
        <li>Detroit Pistons</li>
        <li>Indiana Pacers</li>
        <li>Milwaukee Bucks</li>
      </ul>
    </section>

    <section>
      <h3>
        <span class="title">
          <span>
            Southeast Division
          </span>
        </span>  
      </h3>
      <ul>
        <li>Atlanta Hawks</li>
        <li>Charlotte Hornets</li>
        <li>Miami Heat</li>
        <li>Orlando Magic</li>
        <li>Washington Wizards</li>
      </ul>
    </section>
    
  </section>

  <section>
    <h2>
      <span class="title">
        <span>
          Western Conference
        </span>
      </span>
    </h2>

    <section>
      <h3>
        <span class="title">
          <span>
            Northwest Division
          </span>
        </span>    
      </h3>
      <ul>
        <li>Denver Nuggets</li>
        <li>Minnesota Timberwolves</li>
        <li>Oklahoma City Thunder</li>
        <li>Portland Trail Blazers</li>
        <li>Portland Trail Blazers</li>
      </ul>
    </section>

    <section>
      <h3>
        <span class="title">
          <span>
            Pacific Division
          </span>
        </span>
      </h3>
      <ul>
        <li>Golden State Warriors</li>
        <li>Los Angeles Clippers</li>
        <li>Los Angeles Lakers</li>
        <li>Phoenix Suns</li>
        <li>Sacramento Kings</li>
      </ul>
    </section>

    <section>
      <h3>
        <span class="title">
          <span>
            Southwest Division
          </span>
        </span>
      </h3>
      <ul>
        <li>Dallas Mavericks</li>
        <li>Houston Rockets</li>
        <li>Memphis Grizzlies</li>
        <li>New Orleans Pelicans</li>
        <li>San Antonio Spurs</li>
      </ul>
    </section>
    
  </section>
</div>
!

CSS 

              
                .title {
  animation-timeline: view(block);
  animation-name: shrink;
  animation-range: entry -10% contain 40%;
}

@keyframes shrink {
  from {
    width: 100%;
    scale: 0.8;
    opacity: 0;
  }
  to {
    width: calc(50% - 2px);
    scale: 1;
    opacity: 1;
  }
}

li {  
  animation-timeline: view(block);
  animation-name: grow;
  animation-range: entry -10% contain 40%;
}

@keyframes grow {
  from {
    scale: 0.8;
    opacity: 0;
  }
  to {
    scale: 1;
    opacity: 1;
  }
}

.label {
  animation-timeline: view(block);
  animation-name: fadeout;
  animation-range: contain 0% contain 100%;
}

@keyframes fadeout {
  from {
    scale: 1;
    opacity: 1;
  }
  to {
    translate: 0 -250%;
    scale: 0.8;
    opacity: 0;
  }
}




















































/* Base Styles */
* {
  box-sizing: border-box;
}

html {
  font-family: Arial, Helvetica, sans-serif;
  color: #777;
  height: 100%;
}

body {
  display: grid;
  place-items: center;
  margin: 0;
  height: 100%;
}

div {
  border: solid 1px #ccc;
  height: var(--height);
  width: 90vw;
  overflow-y: auto;
  overflow-x: hidden;
  
  --height: 500px;
}

article {
  padding: 1.25em;
  position: relative;
  min-height: var(--height);
}

.label {
  align-items: center;
  bottom: 1em;
  color: #ff495d;
  display: flex;
  gap: 0.25em;
  justify-content: center;
  position: absolute;
  left: 0;
  right: 0;
}

.label span {
  font-size: 125%;
}

section {
  position: relative;
}

section:last-of-type section:last-of-type {
  min-height: var(--height);
}

h1 {
  color: #333;
}

p {
  font-size: 18px;
  line-height: 1.5;
}

h2, h3 {
  color: white;
  display: flex;
  font-size: 1.5em;
  margin: 0;
  position: sticky;
  top: 0;
}

h2::before, h3::before {
  background: #ccc;
  content: '';
  height: 1px;
  position: absolute;
  width: 100%;
}

h2 {
  justify-content: flex-end;
  margin-bottom: 0.25rem;
  z-index: 2;
}

h2::before {
  right: 0;
  top: 0;
}

h3 {
  z-index: 1;
}

h3::before {
  left: 0;
  bottom: 0;
}

.title {
  align-items: center;
  display: flex;
  font-size: 85%;
  height: 50px;
  padding-inline: 0.5em;
  min-width: calc(50% - 2px);
}

h2 .title {
  background-color: #6244b0;
  transform-origin: right;
}

h3 .title {
  background-color: #3dc0d1;
  transform-origin: left;
}

ul {
  list-style: none;
  margin: 0;
  font-size: 18px;
  padding: 0 0.25rem;
}

li {
  background-color: rgba(0, 0, 0, 0.05);
  line-height: 1.5;
  margin-block: 0.25rem;
  padding: 0.75em 1em;
  transform-origin: left;
}
!

JS
!
999px

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