So I was exporting an Org doc to html the other day, and I was trying to follow this guide to make the list elements appear as a comma-separated list

It didn't work, and I discovered this was because Org adds a <br> element to the <li> element if the <li> element is created from an Org headline element. The easiest way to fix this and allow the aforementioned guide to work is by ensuring that all those <br> elements have `display: none` set via CSS. To make this easier and/or reduce the risk of accidentally removing other elements, we can add a class name to those <br>'s the way we do to other elements.

I have included an example change. This is just the simplest possible solution. Obviously if someone thinks a more complicated/featureful solution is required, we can do more stuff.

--dmr