jQuery index() in vanilla javascript

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You can build your own function :

function indexInParent(node) {
    var children = node.parentNode.childNodes;
    var num = 0;
    for (var i=0; i<children.length; i++) {
         if (children[i]==node) return num;
         if (children[i].nodeType==1) num++;
    }
    return -1;
}

Demonstration (open the console)

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