JSFiddle - React, Tailwind, and code Playground

HTML

<div id="div1" myattr="hello" myAttr111223="hello1">Any text</div>

JavaScript

el = document.getElementById('div1');
attrs=el.attributes
for (var i=0; i<attrs.length; i++)
{
    attrName = attrs.item(i).nodeName;
    attrValue = attrs.item(i).nodeValue; 
    //alert(attrs.item(i).nodeName);
    if(attrName.indexOf('myattr') != -1)
    {
        alert("Attr Name " + attrName + " Attr Value " + attrValue );
    }
    
}