onerror HTML Attribute

The "onerror" attribute in HTML is an event attribute that can be added to an element, that when triggered, runs a script when an error occurs while loading an external resource (such as an image, script, or frame). 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 onerror attribute is used to alert the user when an error occurs while loading an image:


<img src="image.png" onerror="alert('Error loading image')">

The onerror attribute can be used on most HTML elements that can load external resources, such as images, scripts, iframes, etc. It's useful to handle errors that might occur when loading external resources and to provide a fallback or a message to the user if something goes wrong.

It's worth noting that the onerror attribute is widely supported by all modern browsers, and also it is a standard attribute, which means it is part of the official HTML specification.

In summary, the "onerror" attribute in HTML is an event attribute that can be added to an element that, when triggered, runs a script when an error occurs while loading an external resource. It can be used on most HTML elements that can load external resources, such as images, scripts, iframes, etc. It's useful to handle errors that might occur when loading external resources and to provide a fallback or a message to the user if something goes wrong. It is widely supported and is a standard attribute, which means it is part of the official HTML specification.