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balanced-listeners
==================
Checks that for every occurrence of 'addEventListener' or 'on' there is an
occurrence of 'removeEventListener' or 'off' with the same event name.
Examples of incorrect code for this rule:
-----------------------------------------
.. code-block:: js
elt.addEventListener('click', handler, false);
Examples of correct code for this rule:
---------------------------------------
.. code-block:: js
elt.addEventListener('event', handler);
elt.removeEventListener('event', handler);
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