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In WPT Events, TypeError is expected if both listener and
signal are null. But checking listener doesn't throw TypeError.
So check signal before listener because checking signal throws
TypeError if signal is null.
PR-URL: #46054
Reviewed-By: Antoine du Hamel <[email protected]>
Reviewed-By: Juan José Arboleda <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Minwoo Jung <[email protected]>
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