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Document: beforescriptexecute event

Non-standard: This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

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 methods like addEventListener(), or set an event handler property.

js

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

onbeforescriptexecute = (event) => {};

Event type

A generic Event.

Examples

js

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

document.addEventListener("beforescriptexecute", starting, true);
// or
document.onbeforescriptexecute = starting;

View Live Example

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
beforescriptexecute_event No No 9 No No No No No 9 No No No

See also

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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/Document/beforescriptexecute_event