Element: beforescriptexecute event
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.
Deprecated: This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.
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