Expert Developer JavaScript Question:

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To set up your own JavaScript error handler some optional parameters has to be known. These parameters are as follows:
- Textual description of error
- Address (URL) of page on which error occurred
- Number of line in which error occurred
If you want to invoke the default error handler of the browser, then your function should return (false) or vice versa. Example code:
function handlerFunction(description,page,line)
{ // put error-handling operators here
return true;}
window.onerror=handlerFunction;