HTML | DOM Style borderTopLeftRadius Property

Difficulty Level : Basic
Last Updated : 30 Jul, 2019

The DOM Style borderTopLeftRadius property is used to set or return the radius of the top left border of an element.

Syntax:

To get the borderTopLeftRadius Property
```
object.style.borderTopLeftRadius
```

To set the borderTopLeftRadius Property

object.style.borderTopLeftRadius = "length | percentage | 
initial | inherit"

Property Values:

length: This is used to define the radius in fixed length units. Two values may be used to specify the radii of the quarter ellipse, the first value being the horizontal radius and the second value being the vertical radius.

Example-1: Using one value to specify the radius.

<!DOCTYPE html>
<html lang="en">
  
<head>
    <title>
        DOM Style BorderTopLeftRadius
    </title>
  
    <style>
        .elem {
            padding: 10px;
            border-style: solid;
        }
    </style>
</head>
  
<body>
    <h1 style="color: green">
      GeeksforGeeks
    </h1>
    <b>
      DOM Style BorderTopLeftRadius
    </b>
    <p class="elem">
        GeeksforGeeks is a computer science portal
      with a huge variety of well written and 
      explained computer science and programming 
      articles, quizzes and interview questions.
    </p>
    <button onclick="changeRadius()">
      Change borderTopLeftRadius
    </button>
  
    <!-- Script to change borderTopLeftRadius -->
    <script>
        function changeRadius() {
            elem = document.querySelector('.elem');
            elem.style.borderTopLeftRadius = '30px';
        }
    </script>
</body>
  
</html>

Output:

Before clicking the button:

length-one-before

After clicking the button:

length-one-after

Example-2: Using two values to specify the radius.

<!DOCTYPE html>
<html lang="en">
  
<head>
    <title>
        DOM Style BorderTopLeftRadius
    </title>
    <style>
        .elem {
            padding: 10px;
            border-style: solid;
        }
    </style>
</head>
  
<body>
    <h1 style="color: green">
      GeeksforGeeks
    </h1>
    <b>
      DOM Style BorderTopLeftRadius
    </b>
    <p class="elem">
      GeeksforGeeks is a computer science portal
      with a huge variety of well written and
      explained computer science and programming
      articles, quizzes and interview questions.
    </p>
    <button onclick="changeRadius()">
      Change borderTopLeftRadius
    </button>
  
    <!-- Script to change borderTopLeftRadius -->
    <script>
        function changeRadius() {
            elem = document.querySelector('.elem');
            elem.style.borderTopLeftRadius = '30px 60px';
        }
    </script>
</body>
  
</html>

Output:

Before clicking the button:

length-two-before

After clicking the button:

length-two-after

percentage: This is used to define the radius in percentage units. Two values may be used to specify the radii of the quarter ellipse, the first value being the horizontal radius which is the percentage of the width of the border box, and the second value being the vertical radius which is the percentage of the height of border-box.

Example-3: Using one value to specify the radius.

<!DOCTYPE html>
<html lang="en">
  
<head>
    <title>
        DOM Style BorderTopLeftRadius
    </title>
    <style>
        .elem {
            padding: 10px;
            border-style: solid;
        }
    </style>
</head>
  
<body>
    <h1 style="color: green">
      GeeksforGeeks
    </h1>
    <b>
      DOM Style BorderTopLeftRadius
    </b>
    <p class="elem">
      GeeksforGeeks is a computer science
      portal with a huge variety of well 
      written and explained computer 
      science and programming articles, 
      quizzes and interview questions.
    </p>
    <button onclick="changeRadius()">
      Change borderTopLeftRadius
    </button>
  
    <!-- Script to change borderTopLeftRadius -->
    <script>
        function changeRadius() {
            elem = document.querySelector('.elem');
            elem.style.borderTopLeftRadius = '20%';
        }
    </script>
</body>
  
</html>

Output:

Before clicking the button:

percentage-one-before

After clicking the button:

percentage-one-after

Example-4: Using two values to specify the radius.

<!DOCTYPE html>
<html lang="en">
  
<head>
    <title>
        DOM Style BorderTopLeftRadius
    </title>
    <style>
        .elem {
            padding: 10px;
            border-style: solid;
        }
    </style>
</head>
  
<body>
    <h1 style="color: green">
      GeeksforGeeks
    </h1>
    <b>
      DOM Style BorderTopLeftRadius
    </b>
    <p class="elem">
     GeeksforGeeks is a computer science portal
      with a huge variety of well written and 
      explained computer science and programming
      articles, quizzes and interview questions.
    </p>
    <button onclick="changeRadius()">
      Change borderTopLeftRadius
    </button>
  
    <!-- Script to change borderTopLeftRadius -->
    <script>
        function changeRadius() {
            elem = document.querySelector('.elem');
            elem.style.borderTopLeftRadius = '30% 90%';
        }
    </script>
</body>
  
</html>

Output:

Before clicking the button:

percentage-two-before

After clicking the button:

percentage-two-after

initial: This is used to set this property to its default value.

Example-5:

<!DOCTYPE html>
<html lang="en">
  
<head>
    <title>
        DOM Style BorderTopLeftRadius
    </title>
    <style>
        .elem {
            padding: 10px;
            border-style: solid;
            border-top-left-radius: 30px;
        }
    </style>
</head>
  
<body>
    <h1 style="color: green">
      GeeksforGeeks
    </h1>
    <b>
      DOM Style BorderTopLeftRadius
    </b>
    <p class="elem">
      GeeksforGeeks is a computer science portal
      with a huge variety of well written and 
      explained computer science and programming 
      articles, quizzes and interview questions.
    </p>
    <button onclick="changeRadius()">
      Change borderTopLeftRadius
    </button>
  
    <!-- Script to change borderTopLeftRadius -->
    <script>
        function changeRadius() {
            elem = document.querySelector('.elem');
            elem.style.borderTopLeftRadius = 'initial';
        }
    </script>
</body>
  
</html>

Output:

Before clicking the button:

initial-before

After clicking the button:

initial-after

inherit-6: This inherits the property from its parent.

Example:

<!DOCTYPE html>
<html lang="en">
  
<head>
    <title>
        DOM Style BorderTopLeftRadius
    </title>
    <style>
        #parent {
            padding: 10px;
            border-style: solid;
            /* Setting the borderTopLeftRadius of the parent */
            border-top-left-radius: 30px;
        }
          
        .elem {
            padding: 10px;
            border-style: solid;
        }
    </style>
</head>
  
<body>
    <h1 style="color: green">
      GeeksforGeeks
    </h1>
    <b>
      DOM Style BorderTopLeftRadius
    </b>
    <br>
    <br>
    <div id="parent">
        <p class="elem">
          GeeksforGeeks is a computer science portal
          with a huge variety of well written and 
          explained computer science and programming
          articles, quizzes and interview questions.
        </p>
    </div>
    <br>
    <button onclick="changeRadius()">
      Change borderTopLeftRadius
    </button>
  
    <!-- Script to change borderTopLeftRadius -->
    <script>
        function changeRadius() {
            elem = document.querySelector('.elem');
            elem.style.borderTopLeftRadius = 'inherit';
        }
    </script>
</body>
  
</html>