Currently I use the CSS class you add .has-element-css on every build to show me which elements has element CSS. I use the script @Misho posted at some point.
If there is a custom class like has-element-css for custom attributes and conditionals that would be awesome.
Currently the conditionals / custom attributes are hidden away and it is not easy find them or know which elements we’ve set them on. As the builder gets more complex and we can do more things it becomes difficult to find what we’ve done.
This would at least allow us to create our own CSS to show us where theses things have been applied.