Onhashchange HTML Attribute

The "onhashchange" attribute in HTML is an event attribute that can be added to an element, that when triggered, runs a script when the fragment identifier (the part of the URL after the "#" symbol) of the document's current URL changes. The attribute value is a string containing the JavaScript code that should be executed when the event is fired.

For example, in the following code snippet, the onhashchange attribute is used to alert the user when the fragment identifier of the current URL changes:


<body onhashchange="alert('Hash changed')">

The onhashchange attribute is typically used to listen for changes to the fragment identifier of the current URL, and can be used to implement client-side routing, where the application updates the URL fragment and then updates the content of the page based on the fragment.

It's worth noting that the onhashchange attribute is supported by most modern browsers, but not all, so it's important to check the browser compatibility before using it in your website.

In summary, the "onhashchange" attribute in HTML is an event attribute that can be added to an element, that when triggered, runs a script when the fragment identifier (the part of the URL after the "#" symbol) of the document's current URL changes. It's typically used to listen for changes to the fragment identifier of the current URL, and can be used to implement client-side routing. It is supported by most modern browsers, but not all, so it's important to check the browser compatibility before using it in your website.