Pass the <div id="app"> to initApp() #50
Merged
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Now main.js retrieves the top level element and passes it to initApp(), which then gets passed to the other components.
While still thinking about the <form> + DocumentFragment problem, it occurred to me that not every component should need to call document.querySelector('#app'). I'm also currently expecting the <form> solution I come up with to require creating elements on the main DOM instead of a DocumentFragment.
Plus, if we ever want to change that ID, or use a class name, etc., we'd have to update every querySelector() call. This new architecture eliminates that particular problem.