HTML | DOM ontoggle Event

The ontoggle event in HTML DOM occurs when the <details> element user opens or closes by the user. The <details> tag is used for the content/information which is initially hidden but could be displayed if the user wishes to see it.

Syntax:

In HTML:
```
<element ontoggle="Script">
```
In JavaScript:
```
object.ontoggle = function(){Script};
```
In JavaScript, using the addEventListener() method:
```
object.addEventListener("toggle", Script);
```

Example:

<!DOCTYPE html> 
<html> 
  
<head> 
    <title>HTML DOM ontoggle Event</title> 
</head> 
  
<body> 
    <center> 
        <h1 style="color:green">GeeksforGeeks</h1> 
        <h2>HTML DOM ontoggle Event</h2> 
  
        <details id="detailsID"> 
            <summary>Show details</summary> 
            <p> 
              5th Floor, A-118,  
              Sector-136, Noida, Uttar Pradesh - 201305  
              feedback@geeksforgeeks.org 
            </p> 
  
        </details> 
  
    </center> 
    <script> 
        document.getElementById( 
          "detailsID").addEventListener("toggle", GFGfun); 
  
        function GFGfun() { 
            alert("ontoggle"); 
        } 
    </script> 
  
</body> 
  
</html> 

Output:
Before:

After:

Supported Browsers: The browsers supported by DOM ontoggle Event are listed below:

Google Chrome
Internet Explorer
Firefox
Apple Safari
Opera

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Vijay Sirra

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