I am using various online tools for translation and proofreading, and I find that it would be very interesting to be able to display the most common formatting symbols in a browser.
(Spaces and non-breakable spaces are be very different and important, as is being able to count line breaks at a glance for example).
I believe that since they are encoded by different HTML codes, there should be a way to display them within a webpage, but couldn't find any way to do this no matter what browser I looked into.
Here's what the difference looks like in the HTML between non-breakable space and regular space:
jusqu'à 19 heures
It seems that it would be so simple to program it into an app or as an add-on (replace regular space with the regular space symbol, replace with non-breakable space symbol, etc), that I can't understand how there's almost nothing about such a feature online.