And your example about CSS and browsers is exactly this. There can be information added to indicate how things should be displayed, but it’s ultimately up to th

And your example about CSS and browsers is exactly this. There can be information added to indicate how things should be displayed, but it’s ultimately up to the renderer. All the tricks used to adapt to various ways browsers render the same data, and sometimes the same (font and CSS) data in different contexts (say, as part of a <p> vs part of an <input>) in the same browser.