[Solved] How to pass innerHTML of an element to an event handler attribute [closed]

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You are selecting all the buttons with the code and thus not getting the correct / selected value:

var userChoice = document.getElementsByTagName('button').innerHTML;

What you could try is to alter the gameMechanism function 

function gameMechanism(element) {
    var userChoice = element.innerHTML;
}

and then change the html to:

<button id="Rock" onclick="gameMechanism(this);">Rock</button>

solved How to pass innerHTML of an element to an event handler attribute [closed]