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

Specifications

Not part of any specification.

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
beforescriptexecute event
Non-standard

Legend

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Full support
Full support
No support
No support
Non-standard. Check cross-browser support before using.

See also