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Why they dont work in posts ? I try to have my paragraphes lower for simply aesthetics, but I'm not able to do it.

I also tried: <br>

All the best and Thank you all. Zizi.

I've run into this as well.

Only suggestion I found on WP forums was to throw in a "." and color it the same as background. Not elegant, but maybe a band-aid to help.

You can use something like <div style="margin-bottom: 30px">&nbsp;</div>