How to inherit CSS properties of parent Element using JavaScript?

Javascript Web Development Object Oriented Programming

You can use classList.add() along with append(). Use the document.createElement() to create a new div and the classList.add() would add the CSS class.(.class selector).

Example

Live Demo

<html lang="en>
<head>
<meta charset="UTF-8>
<meta name="viewport" content="width=device-width, initialscale=1.0">
<title>Document</title>
<link rel="stylesheet" href="//code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css">
<script src="https://code.jquery.com/jquery-1.12.4.js"></script>
<script src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script>
<style>
   .add-all-subject {
      display: grid;
      height: 100px;
      width: 100px;
      grid-template-columns: 2fr 2fr 2fr 2fr 2fr;
      grid-template-rows: 2fr;
      grid-column-gap: 5.9rem;
      grid-row-gap: 2rem;
      color: red;
      border: 2px solid red;
   }
</style>
</head>
<body>
<button onclick="saveAllSubjects()">Add Subjects</button>
<div id="add-subject">
</div>
<script>
   const addSubjectArea = document.getElementById("add-subject");
   function saveAllSubjects() {
      const allSubject = document.createElement('div');
      allSubject.classList.add('add-all-subject');
      addSubjectArea.append(allSubject);
   }
</script>
</body>
</html>

To run the above program, save the file name “anyName.html(index.html)” and right click on the file. Select the option “Open with Live Server” in VS Code editor.