A number of these are using older, awkward APIs, when there's nicer native versions now.

For example, "replace an element" is

    ele.parentNode.replaceChild(newEle, ele);

but unless you're targeting Chrome < 54, FF < 49, or Safari < 10, you can just do

    ele.replaceWith(newEle)

`replaceWith` also lets you replace a node with _multiple_ nodes, or with text.

Similarly, "loop over a nodelist" wants you to use array spread and then forEach, instead of just

    for (let ele of nodelist) ...