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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.

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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

Any URLs added here will be added as <link>s in order, and before the CSS in the editor. You can use the CSS from another Pen by using its URL and the proper URL extension.

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About External Resources

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

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

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About External Resources

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 

              
                <!-- Read the full post on <caption> <th> at https://jen4web.substack.com/p/caption  -->

<h1>Examples:</h1>
<h2>#1: As seen on Substack</h2>
<table>
  <caption>Table 1: Date, time, and temperature recordings in Watertown, Massachusetts</caption>
  <tr>
    <th>Date</th>
    <th>Time</th>
    <th>Temperature</th>
  </tr>
  <tr>
     <td><time datetime="2021-04-22">April 22</time></td>
     <td><time datetime="11:00">11 AM</time></td>
     <td>50&deg;F/10&deg;C</td>
   </tr> 
</table>

<table>
  <caption>Table 1: Date, time, and temperature recordings in Watertown, Massachusetts</caption>
  <tr>
    <th>Date</th>
    <td><time datetime="2021-04-22">April 22</time></td>
    <td><time datetime="2021-04-23">April 23</time></td>
  </tr>
  <tr>
     <th>Time</th>
     <td><time datetime="13:00">1 PM</time></td>
     <td><time datetime="11:00">11 AM</time></td>
   </tr> 
  <tr>
     <th>Temperature</th>
     <td>50&deg;F/10&deg;C</td>
     <td>60&deg;F/16&deg;C</td>
   </tr> 
</table>

<h2>#2: Basic</h2>

<table>
  <caption>Electric cars with the longest range</caption>
  <tr>
    <th>Rating</th>
    <th>Model</th>
    <th>Description</th>
    <th>Range</th>
  </tr>
  <tr>
    <td>1</td>
    <td>2021 Tesla Model S</td>
    <td>Performance all-wheel drive with 19-inch wheels</td>
    <td>387 miles</td>
  </tr>
  <tr>
    <td>2</td>
    <td>2021 Tesla Model X</td>
    <td>Long Range Plus RWD</td>
    <td>371 miles</td>
  </tr>
  <tr>
    <td>3</td>
    <td>2021 Tesla Model 3</td>   
    <td>Long Range AWD</td>
    <td>353 mile</td>
  </tr>
  <tr>
    <td>4</td>
    <td>2021 Tesla Model Y</td>
    <td>Long Range RWD</td>
    <td>326 miles</td>
  </tr>
  <tr>
    <td>5</td>
    <td>2021 Ford Mustang Mach-E</td>
    <td>RWD</td>
    <td>305 miles</td>
  </tr>
  <tr>
    <td>6</td>
    <td>2021 Chevrolet Bolt EV</td>
    <td></td>
    <td>259 miles</td>
  </tr>
  <tr>
    <td>7</td>
    <td>2021 Hyundai Kona Electric</td>
    <td></td>
    <td>258 miles</td>
  </tr>
  <tr>
    <td>8</td>
    <td>2021 Volkswagen ID.4</td>
    <td>1st Edition RWD</td>
    <td>250 miles</td>
  </tr>
</table>

<!-- https://www.cars.com/articles/electric-vehicles-with-the-longest-range-422227/ -->

<h2>#3: Using colspan and rowspan</h2>
<!-- check the CSS for all kinds of styling ideas -->

<table class="example-2">
  <caption>Fifth grade school schedule</caption>
  <tr>
    <!-- cell with no data must still be included in the table, to properly align the cells to come -->
    <td></td>
    <th scope="col">Monday</th>
    <th scope="col">Tuesday</th>
    <th scope="col">Wednesday</th>
    <th scope="col">Thursday</th>
    <th scope="col">Friday</th>
  <tr>
    <th scope="row">9 AM</th>
    <td colspan="5">Homeroom</td>
  </tr>
  <tr>
    <th scope="row">10 AM</th>
    <td>Library</td>
    <td>Art</td>
    <td>Music</td>
    <td>Gym</td>
    <td>Spanish</td>
  </tr>
  <tr>
    <th scope="row">11 AM</th>
    <td colspan="5">Math</td>
  </tr>
  <tr>
    <th scope="row">12 PM</th>
    <td colspan="5">Lunch</td>
  </tr>
  <tr>
    <th scope="row">1 PM</th>
    <td colspan="5">Recess</td>
  </tr>
  <tr>
    <th scope="row">1:30 PM</th>
    <td>Science</td>
    <td>Science</td>
    <td>Social Studies</td>
    <td>Social Studies</td>
    <td rowspan="2">Book club</td>
  </tr>
  <tr>
    <th scope="row">2 PM</th>
    <td>Reading</td>
    <td>Reading</td>
    <td>SEL<sup>*</sup></td>
    <td>SEL<sup>*</sup></td>
  </tr>
</table>

<footer>
  <p><small>* social and emotional learning</small></p>
</footer>
!

CSS 

              
                body {
  font-family: Arial, sans-serif;
  font-size: 1.2rem;
}
/* tables without any styling don't show off the tablular data as well - some simple styling included so you can see the pieces - comment these declarations out to see what we mean */
table {
  border-collapse: collapse;
}
/* added th to this style to add border and control alignment */
td, th {
  border: 1px solid black;
  padding: 0.5em;
  text-align: left;
}
th {
  background-color: #fed330;
}
caption {
  text-align: left;
  margin-top: 2rem;
  font-weight: bold;
}
/* exceptions for example 2 */
.example-2 td {
  text-align: center;
}
.example-2 th {
  background-color: #fa8231;
  color: white;
}
.example-2 th:first-child {
  /* selects the first "column" by selecting the first child in each row, which is a heading */
  background-color: #2d98da;
}
.example-2 tr:nth-child(even) {
  /* for even number rows... 
  Remember the first row counts, even though it's got th instead of td */
  background-color: #d1d8e0;
}
.example-2 tr:first-child td:first-child {
  /* first cell in the first row... */
  background-color: black;
}
.example-2 caption {
  caption-side: bottom;
  margin-top: 0;
  border: 1px solid black;
  border-top: none;
  padding: 0.5rem;
  background-color: #8854d0;
  color: white;
}
!

JS 

              
                /* 

💯 This challenge is certified 100% free of JavaScript. 

ALL THE GOOD STUFF IS IN THE HTML BLOCK :-D

*/
!
999px

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