JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.4/themes/ui-lightness/jquery-ui.css">
<img class="IN-something" src = "http://dummyimage.com/120x90/f00/fff.png&text=my+image" />

JavaScript

alert( $('img').is('[class |= IN]') );