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.
Fired when the code in a <script> element declared in an HTML document is about to start executing. Does not fire if the element is added dynamically, eg with appendChild().
document.onbeforescriptexecute = funcRef;
funcRef is a function reference, called when the event is fired. The event's target attribute is set to the script Element that is about to be executed.
function starting(e) { logMessage("Starting script with ID: " + e.target.id); } document.addEventListener("beforescriptexecute", starting, true);
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
onbeforescriptexecute |
No |
No |
9 |
No |
No |
No |
No |
No |
9 |
No |
No |
No |
© 2005–2021 MDN contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/Document/onbeforescriptexecute