JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" id="search"/>
<ul id='list' data-role='listview' data-filter='true' data-inset='false'>
    <li id='a1'>
        <h3>ABC</h3>
        <p>this is ABC</p>
    </li>
    <li id='a2'>
        <h3>DEF</h3>
        <p>DEF is not ABC</p>
    </li>
</ul>

JavaScript

$("#search").keyup(function(){
    
    var SEARCHWORD = this.value;
$("#list li").each(function(){

    if($(this).
              find("h3").
              text().toUpperCase().
              indexOf(SEARCHWORD.toUpperCase()) >=0)
       $(this).show();
    else
       $(this).hide();

});


});