https://codex.wordpress.org/Using_Javascript#JavaScript_in_Posts
every script content must be HTML-Commentet out, for the parser to not add paragraphs:
<script type="text/javascript"> and no dual ! -> WP makesout of it... all loaded scripts must have external URLS beginning with src="//mm.li..." problems with jquery - not found by our scripts tiles have strange shadow - explicitely add no-shadow css some say, wordpress.com doesn't allow JS in HTML section - would make sense