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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

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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 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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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.

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HTML 

              
                <html lang="en">
  <head>
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Rich Text Editor</title>
    <!-- FontAwesome Icons -->
    <link
      rel="stylesheet"
      href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.1.1/css/all.min.css"
    />
    <!-- Google Fonts -->
    <link
      href="https://fonts.googleapis.com/css2?family=Poppins&display=swap"
      rel="stylesheet"
    />
    <!-- Stylesheet -->
    <link rel="stylesheet" href="style.css" />
  </head>
  <body>
    <div class="container">
      <div class="options">
        <!-- Text Format -->
        <button id="bold" class="option-button format">
          <i class="fa-solid fa-bold"></i>
        </button>a@Q 
        superscript"></i>
        </button>
        <button id="subscript" class="option-button script">
          <i class="fa-solid fa-subscript"></i>
        </button>

        <!-- List -->
        <button id="insertOrderedList" class="option-button">
          <div class="fa-solid fa-list-ol"></div>
        </button>
        <button id="insertUnorderedList" class="option-button">
          <i class="fa-solid fa-list"></i>
        </button>

        <!-- Undo/Redo -->
        <button id="undo" class="option-button">
          <i class="fa-solid fa-rotate-left"></i>
        </button>
        <button id="redo" class="option-button">
          <i class="fa-solid fa-rotate-right"></i>
        </button>

        <!-- Link -->
        <button id="createLink" class="adv-option-button">
          <i class="fa fa-link"></i>
        </button>
        <button id="unlink" class="option-button">
          <i class="fa fa-unlink"></i>
        </button>

        <!-- Alignment -->
        <button id="justifyLeft" class="option-button align">
          <i class="fa-solid fa-align-left"></i>
        </button>
        <button id="justifyCenter" class="option-button align">
          <i class="fa-solid fa-align-center"></i>
        </button>
        <button id="justifyRight" class="option-button align">
          <i class="fa-solid fa-align-right"></i>
        </button>
        <button id="justifyFull" class="option-button align">
          <i class="fa-solid fa-align-justify"></i>
        </button>
        <button id="indent" class="option-button spacing">
          <i class="fa-solid fa-indent"></i>
        </button>
        <button id="outdent" class="option-button spacing">
          <i class="fa-solid fa-outdent"></i>
        </button>

        <!-- Headings -->
        <select id="formatBlock" class="adv-option-button">
          <option value="H1">H1</option>
          <option value="H2">H2</option>
          <option value="H3">H3</option>
          <option value="H4">H4</option>
          <option value="H5">H5</option>
          <option value="H6">H6</option>
        </select>

        <!-- Font -->
        <select id="fontName" class="adv-option-button"></select>
        <select id="fontSize" class="adv-option-button"></select>

        <!-- Color -->
        <div class="input-wrapper">
          <input type="color" id="foreColor" class="adv-option-button" />
          <label for="foreColor">Font Color</label>
        </div>
        <div class="input-wrapper">
          <input type="color" id="backColor" class="adv-option-button" />
          <label for="backColor">Highlight Color</label>
        </div>
      </div>
      <div id="text-input" contenteditable="true"></div>
    </div>
    <!--Script-->
    <script src="script.js"></script>
  </body>
</html>
!

CSS 

              
                * {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}
body {
  background-color: #338cf4;
}
.container {
  background-color: #ffffff;
  width: 90vmin;
  padding: 50px 30px;
  position: absolute;
  transform: translate(-50%, -50%);
  left: 50%;
  top: 50%;
  border-radius: 10px;
  box-shadow: 0 25px 50px rgba(7, 20, 35, 0.2);
}
.options {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 15px;
}
button {
  height: 28px;
  width: 28px;
  display: grid;
  place-items: center;
  border-radius: 3px;
  border: none;
  background-color: #ffffff;
  outline: none;
  color: #020929;
}
select {
  padding: 7px;
  border: 1px solid #020929;
  border-radius: 3px;
}
.options label,
.options select {
  font-family: "Poppins", sans-serif;
}
.input-wrapper {
  display: flex;
  align-items: center;
  gap: 8px;
}
input[type="color"] {
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  background-color: transparent;
  width: 40px;
  height: 28px;
  border: none;
  cursor: pointer;
}
input[type="color"]::-webkit-color-swatch {
  border-radius: 15px;
  box-shadow: 0 0 0 2px #ffffff, 0 0 0 3px #020929;
}
input[type="color"]::-moz-color-swatch {
  border-radius: 15px;
  box-shadow: 0 0 0 2px #ffffff, 0 0 0 3px #020929;
}
#text-input {
  margin-top: 10px;
  border: 1px solid #dddddd;
  padding: 20px;
  height: 50vh;
}
.active {
  background-color: #e0e9ff;
}
!

JS 

              
                let optionsButtons = document.querySelectorAll(".option-button");
let advancedOptionButton = document.querySelectorAll(".adv-option-button");
let fontName = document.getElementById("fontName");
let fontSizeRef = document.getElementById("fontSize");
let writingArea = document.getElementById("text-input");
let linkButton = document.getElementById("createLink");
let alignButtons = document.querySelectorAll(".align");
let spacingButtons = document.querySelectorAll(".spacing");
let formatButtons = document.querySelectorAll(".format");
let scriptButtons = document.querySelectorAll(".script");

//List of fontlist
let fontList = [
  "Arial",
  "Verdana",
  "Times New Roman",
  "Garamond",
  "Georgia",
  "Courier New",
  "cursive",
];

//Initial Settings
const initializer = () => {
  //function calls for highlighting buttons
  //No highlights for link, unlink,lists, undo,redo since they are one time operations
  highlighter(alignButtons, true);
  highlighter(spacingButtons, true);
  highlighter(formatButtons, false);
  highlighter(scriptButtons, true);

  //create options for font names
  fontList.map((value) => {
    let option = document.createElement("option");
    option.value = value;
    option.innerHTML = value;
    fontName.appendChild(option);
  });

  //fontSize allows only till 7
  for (let i = 1; i <= 7; i++) {
    let option = document.createElement("option");
    option.value = i;
    option.innerHTML = i;
    fontSizeRef.appendChild(option);
  }

  //default size
  fontSizeRef.value = 3;
};

//main logic
const modifyText = (command, defaultUi, value) => {
  //execCommand executes command on selected text
  document.execCommand(command, defaultUi, value);
};

//For basic operations which don't need value parameter
optionsButtons.forEach((button) => {
  button.addEventListener("click", () => {
    modifyText(button.id, false, null);
  });
});

//options that require value parameter (e.g colors, fonts)
advancedOptionButton.forEach((button) => {
  button.addEventListener("change", () => {
    modifyText(button.id, false, button.value);
  });
});

//link
linkButton.addEventListener("click", () => {
  let userLink = prompt("Enter a URL");
  //if link has http then pass directly else add https
  if (/http/i.test(userLink)) {
    modifyText(linkButton.id, false, userLink);
  } else {
    userLink = "http://" + userLink;
    modifyText(linkButton.id, false, userLink);
  }
});

//Highlight clicked button
const highlighter = (className, needsRemoval) => {
  className.forEach((button) => {
    button.addEventListener("click", () => {
      //needsRemoval = true means only one button should be highlight and other would be normal
      if (needsRemoval) {
        let alreadyActive = false;

        //If currently clicked button is already active
        if (button.classList.contains("active")) {
          alreadyActive = true;
        }

        //Remove highlight from other buttons
        highlighterRemover(className);
        if (!alreadyActive) {
          //highlight clicked button
          button.classList.add("active");
        }
      } else {
        //if other buttons can be highlighted
        button.classList.toggle("active");
      }
    });
  });
};

const highlighterRemover = (className) => {
  className.forEach((button) => {
    button.classList.remove("active");
  });
};

window.onload = initializer();
!
999px

Console