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().
Use the event name in methods like addEventListener(), or set an event handler property.
js
addEventListener("beforescriptexecute", (event) => {}); onbeforescriptexecute = (event) => {};
A generic Event.
js
function starting(e) { logMessage(`Starting script with ID: ${e.target.id}`); } document.addEventListener("beforescriptexecute", starting, true); // or document.onbeforescriptexecute = starting;
| 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 |
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https://developer.mozilla.org/en-US/docs/Web/API/Document/beforescriptexecute_event