JSFiddle - React, Tailwind, and code Playground
HTML
<div id="outerDiv">
<div class="testCss">test1</div>
<div class="testCss">test2</div>
<div class="testCss">test3</div>
<div class="testCss">test4</div>
<div class="testCss2">ignoreThis</div>
</div>
CSS
.testCss {
}
JavaScript
$('#outerDiv div[class=testCss]').each(function() {
console.log(this.innerHTML);
});