-Is it only there as a shim/space? then why have a className at all?
Perhaps. But I also see that if I comment out the CSS it doesn’t seem to change anything. If I remove that div, it doesn’t seem to change anything. The class name doesn’t seem to give a clue. Maybe it has some effect on the flow that manifests itself in some screen size - I can’t see it.
I’m going to suggest that we don’t assume that every piece of code we find on the internet is perfectly constructed - especially on codepen. This may have been an idea that got abandoned or someone that just didn’t understand something. True, it is the FCC app, but people make mistakes, people have ideas that get lost. I don’t know who wrote this, but they are human and not perfect. Sometimes even monkeys fall out of trees.
-Does the .converter class have significance in bootstrap or “mocha”?
Well, mocha is a testing framework so I have no idea what it would be doing with css. But clearly it does.
But we can simply check. Those are just imported files. If I check those imported files out:
I can put those in my address bar, see the contents of the files, and search for the word “converter” - I get bupkis.
-Why do they have font-size rules for a div with no text?
That was a question I had too. Again, maybe someone smarter than me can see a reason for this, but I sure can’t. Again, don’t assume that this was written by a perfectionist expert that proofread everything they wrote.
-Does this mean the div is there for possible future uses or does it have a roll in transpiling the input from editor to preview.
I doubt it has anything to do with transpiling. Perhaps it was meant for future use.
I wasn’t around for the genesis of FCC. But I do know what it is like to build something from the ground up. In the beginning there is often a “lets just get something up and we can worry about cleaning it up later” attitude. This is a little bit of code in an app that works just fine - I’m sure it just never popped up on anyone’s radar. I assume those example projects were just built and left alone. The idea was that no one is going to be digging through their code - just looking at the output.
Or maybe there is a good reason for it that I’m not seeing.
className="converter" div somehow help with asynchronous updates between the editor and the previewer? Is this why it is located between the the two?
I can’t see how. Again, I think it’s just a mistake.
Looking at the history of the pen, I see that that pen was created as a fork from another pen (that doesn’t have that class) nearly 4 years ago.
If you go to the Contributors room, you might be able to find out more, maybe whoever built it is still here. But if they are, they may have no memory of that line. (I regularly scratch my head over things that I wrote 6 months ago.) Or maybe just don’t worry about it. There are much more useful things that you could learn rather than bike-shedding over this.