JSFiddle - React, Tailwind, and code Playground

HTML

<div id="target">
    
</div>

JavaScript

var sHtml = '';
sHtml = '<div class="diagnostic_picture"><img src="test1.gif" />safasfsaf</div>';
sHtml = sHtml + '<div class="diagnostic_picture">fadfasf<img src="test2.gif" /></div>';
sHtml = sHtml + '<div class="diagnostic_picture">asfdasfsdf<img src="test3.gif" /></div>';

$(sHtml).find('img').each(function() {
    $(this).prop('delaySrc', 'something');
    alert($(this).prop('delaySrc')); // just for ensure
});