JSFiddle - React, Tailwind, and code Playground

HTML

<img src="https://joomla-support.ru/data/avatars/m/19/19321.jpg?1394998565" width="96" alt="woojin" onclick="BigSmall(this)">

JavaScript

function BigSmall(pic) {
    var style = pic.style.width;
    var attr = pic.getAttribute("width");
    var real = pic.width;
    var width, newWidth;
    
    if (!style && !attr) {
        width = real;
    } else if (!style) {
        width = attr;
    } else {
        width = style;
    }
    width = parseInt(width);
    pic.removeAttribute("width");
    pic.style.removeProperty("width");
    
    if (width == 200) {
        newWidth=96;
    } else {
        newWidth=200;
    }
    
    pic.style.setProperty("width", newWidth+"px");
}