This. They are essential components, much like the elements (of the periodic table) are the basic building blocks in chemistry. In a similar fashion, the elements of a web page are the foundational building blocks.
But physical things are not made up of elements, they're made up of atoms, which are instances of elements.
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I'm no chemist, but aren't elements instances of atomic structures and not the other way around? And physical things are made up of elements, which would foundationally be made up of atoms first.
But perhaps I'm just misunderstanding.
It's the other way around
