Sure, you might make a `<Button>` UI component (assume React), but if it embeds 30 classes in it, when you server-render this, every button on your page is cont

Sure, you might make a `<Button>` UI component (assume React), but if it embeds 30 classes in it, when you server-render this, every button on your page is contributing ~30 classes worth of bytes to the payload sent across the wire.