<template>: The Content Template element

I wrote some boilerplate JS, yes, but I have complete control over my frontend, and I understand how it works, and I don't need to compile it.

Anyway, it works well so far! The <template> tag is a great way to lay out components and then fill them in with simple JS functions.

One nuance is documented in my code comments:

    // Ohhhhhh wow, we need to use firstElementChild when cloning the content of a template tag (!!!!):
    // https://developer.mozilla.org/en-US/docs/Web/HTML/Reference/Elements/template#avoiding_documentfragment_pitfalls
    // I spent way too long on this.
    const elem = $(tplSelector);
    if (!elem) return;
    return elem.content.firstElementChild.cloneNode(true);

Oh, but I haven't cleaned up my code at all yet because I was just experimenting/hustling, so it's a bit spaghetti :) If you go looking, don't mind the mess.

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