JSFiddle - React, Tailwind, and code Playground

HTML

<ul>
    <li class="bio_accordion"><a class="moreInfo" href="#">lorem</a></li>
    <li class="bio_accordion"><a class="moreInfo" href="#">lorem</a></li>
    <li class="bio_accordion"><a class="moreInfo" href="#">lorem</a></li>
</ul>

CSS

.moreInfo {

}

JavaScript

var content_height = [];

$$('.bio_accordion').each(function(item, index){
    content_height.push(item.getElement('.moreInfo').offsetHeight);
});

console.log(content_height);