javascript - Event listener only for a variable -

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i have following code:

var right = document.getelementsbyclassname("dreapta")[0];  function scaletext(){     right.style.backgroundcolor = "#111";     right.style.color = "white"; } right.addeventlistener('click', scaletext, false);

can explain me why event not working?

the problem html,i had audio tag had removed. working :).ty guys , sorry bothering.


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