Element: beforescriptexecute event
Deprecated
Avoid using this feature in new projects. This feature may be a candidate for removal from web standards or browsers.
Non-standard: This feature is not standardized. We do not recommend using non-standard features in production, as they have limited browser support, and may change or be removed. However, they can be a suitable alternative in specific cases where no standard option exists.
Warning: This event was a proposal in an early version of the specification. Do not rely on it.
The beforescriptexecute event is fired when a script is about to be executed. Cancelling the event prevents the script from executing.
It is a proprietary event specific to Gecko (Firefox).
Syntax
Use the event name in methods like addEventListener(), or set an event handler property.
addEventListener("beforescriptexecute", (event) => { })
onbeforescriptexecute = (event) => { }
Event type
A generic Event.
Specifications
Not part of any specification.
Browser compatibility
See also
afterscriptexecuteevent