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A relatively unknown fact: if you have an id attribute on an element, you can reference it like this:
// html
<button id="yo">…</button>
// js
yo.onclick = ...
Furthermore, child elements with a name attribute can be referenced the same way:
// html
<form id="x">
<input name="em">
</form>
// js
x.em.onclick = ...
Maybe not your favorite API, but it’s a thing.