Is there a way to alter the behavior of the onload event for a script element so that it is triggered every time the src is modified, rather than only once?

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No, the onload event for a script element is only triggered once when the script is initially loaded. If you want to execute code every time the src is modified, you would need to use a different approach, such as periodically checking the src with a timer or using a library that handles dynamic script loading such as RequireJS.