testing/web-platform/tests/workers/support/ErrorEvent.js


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onmessage = function(evt)
{
    throw(new Error(evt.data));
}

onerror = function(message, location, line, col)
{
    postMessage( {"message": message, "filename": location, "lineno": line, "colno": col} );
    return false; // "not handled" so the error propagates up to the Worker object
}