Document: beforescriptexecute event

Deprecated

Avoid using this feature in new projects. This feature may be a candidate for removal from web standards or browsers.

See full compatibility
Learn more

Non-standard: This feature is not standardized. We do not recommend using non-standard features in production, as they have limited browser support, and may change or be removed. However, they can be a suitable alternative in specific cases where no standard option exists.

The beforescriptexecute event fires when a static <script> is about to start executing. It does not fire if the element is added dynamically, such as with appendChild().

Syntax

Use the event name in addEventListener():

addEventListener("beforescriptexecute", (event) => { })

Alternatively, assign to the event handler property of the interface:

onbeforescriptexecute = (event) => { }

Event type

A generic Event.

Examples

function starting(e) {
  logMessage(`Starting script with ID: ${e.target.id}`);
}

document.addEventListener("beforescriptexecute", starting);
// Or (but note that this replaces other event listeners
// added using onbeforescriptexecute, if any)
document.onbeforescriptexecute = starting;

View Live Example