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().
Syntax
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.
Example
function starting(e) { logMessage("Starting script with ID: " + e.target.id); } document.addEventListener("beforescriptexecute", starting, true);
Specification
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
onbeforescriptexecute | Chrome No support No | Edge No support No | Firefox Full support Yes | IE ? | Opera ? | Safari ? | WebView Android No support No | Chrome Android No support No | Firefox Android Full support Yes | Opera Android ? | Safari iOS ? | Samsung Internet Android No support No |
Legend
- Full support
- Full support
- No support
- No support
- Compatibility unknown
- Compatibility unknown
- Non-standard. Expect poor cross-browser support.
- Non-standard. Expect poor cross-browser support.