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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>

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

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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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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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HTML 

              
                <textarea id="myDemoTextArea"></textarea>
<div>
  <a href="#" id="clear_link">Clear</a>
</div>
<div id="table_container"></div>
<textarea id="tableAsJSON"></textarea>
!

CSS 

              
                #myDemoTextArea {
  width: 200px;
  height: 20px;
}

#table_container {
  max-width: 100%;
  width: 450px;
  max-height: 500px;
  overflow-y: scroll;
  padding: 10px;
}

#tableAsJSON {
  width: 450px;
  height: 500px;
}

table.boostrap4_table_head_dark_striped_rounded_compact {
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.5;
  color: #212529;
  text-align: left;
  box-sizing: border-box;
  border-collapse: collapse;
  width: 100%;
  margin-bottom: 1rem;
  background-color: transparent;
}

table.boostrap4_table_head_dark_striped_rounded_compact thead th {
  font-size: 1rem;
  line-height: 1.5;
  border-collapse: collapse;
  box-sizing: border-box;
  text-align: inherit;
  padding: 0.3rem;
  vertical-align: bottom;
  border-bottom: 2px solid #dee2e6;
  color: #fff;
  background-color: #212529;
  border-color: #32383e;
}

table.boostrap4_table_head_dark_striped_rounded_compact td {
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.5;
  color: #212529;
  text-align: left;
  border-collapse: collapse;
  box-sizing: border-box;
  padding: 0.3rem;
  vertical-align: top;
  box-shadow: 0 0 1px #212529;
}

table.boostrap4_table_head_dark_striped_rounded_compact
  tbody
  tr:nth-of-type(odd) {
  background-color: rgba(0, 0, 0, 0.05);
}

table.boostrap4_table_head_dark_striped_rounded_compact th:first-of-type {
  border-top-left-radius: 10px;
}

table.boostrap4_table_head_dark_striped_rounded_compact th:last-of-type {
  border-top-right-radius: 10px;
}

table.boostrap4_table_head_dark_striped_rounded_compact
  tr:last-of-type
  td:first-of-type {
  border-bottom-left-radius: 10px;
}

table.boostrap4_table_head_dark_striped_rounded_compact
  tr:last-of-type
  td:last-of-type {
  border-bottom-right-radius: 10px;
}
!

JS 

              
                let constructTableFromPastedInput = (pastedInput) => {
  let rawRows = pastedInput.split("\n");
  let headRow = "";
  let bodyRows = [];
  rawRows.forEach((rawRow, idx) => {
    let rawRowArray = rawRow.split("\t");
    if (idx == 0) {
      headRow = `<tr><th>${rawRowArray.join("</th><th>")}</th></tr>`;
    } else {
      bodyRows.push(`<tr><td>${rawRowArray.join("</td><td>")}</td></tr>`);
    }
  });
  return `
                <table class="boostrap4_table_head_dark_striped_rounded_compact">
                    <thead>
                        ${headRow}
                    </thead>
                    <tbody>
                        ${bodyRows.join("")}
                    </tbody>
                </table>
            `;
};

let constructJSONFromPastedInput = (pastedInput) => {
  let rawRows = pastedInput.split("\n");
  let headersArray = rawRows[0].split("\t");
  let output = [];
  rawRows.forEach((rawRow, idx) => {
    if (idx > 0) {
      let rowObject = {};
      let values = rawRow.split("\t");
      headersArray.forEach((header, idx) => {
        rowObject[header] = values[idx];
      });
      output.push(rowObject);
    }
  });
  return output;
};

const theTextArea = document.getElementById("myDemoTextArea");

const inputHandler = function (e) {
  let inputText = e.target.value;
  let tableHTML = constructTableFromPastedInput(inputText);
  let tableAsJson = constructJSONFromPastedInput(inputText);
  let prettyJSON = JSON.stringify(tableAsJson, null, 2);
  console.log(prettyJSON);
  document.getElementById("table_container").innerHTML = tableHTML;
  document.getElementById("table_container").style.display = "block";
  document.getElementById("tableAsJSON").value = prettyJSON;
};

theTextArea.addEventListener("input", inputHandler);

document.getElementById("clear_link").addEventListener("click", () => {
  document.getElementById("myDemoTextArea").value = "";
  document.getElementById("table_container").innerHTML = "";
  document.getElementById("table_container").style.display = "none";
  document.getElementById("tableAsJSON").value = "";
});
!
999px

Console