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Yavos / DeviantArt Auto-Zoom

// ==UserScript==  
// @name        DeviantArt Auto-Zoom
// @namespace   Yavos' Toolbox
// @match       *://*.deviantart.com/*  
// @match       *://sta.sh/*  
// @version     2  
// @grant       none  
// @description This script will automatically zoom in all deviations to either their maximum size or to fit the screen if they are too big. (This script will work while browsing as well.)
// @oujs:author Yavos
// @copyright   2014, Yavos
// ==/UserScript==  

var click = document.createEvent("MouseEvents");  
click.initMouseEvent("click", true, true, window,  
0, 0, 0, 0, 0, false, false, false, false, 0, null);  

var devN = 'dev-content-normal';  
var devF = 'dev-content-full';  

// create an observer instance  
var observer = new MutationObserver(checkMutations);  

function resizeImage() {  
    img = document.getElementsByClassName(devN)[0];  
    img2 = document.getElementsByClassName(devF)[0];  
    if (img != undefined && img2 != undefined && img2.style.display != 'block') {  
        img.dispatchEvent(click);  
    };  
};  

function checkMutations(mutations) {  
  mutations.forEach(function(mutation) {  
    var testNodes = mutation.addedNodes;  
    for (var i = 0; i < testNodes.length; ++i) {  
        if (testNodes[i].className == devN) resizeImage();  
    };  
  });  
};  

window.addEventListener ("load", function()   
{   
    resizeImage();  

    // select the target node  
    var target = document.body;  

    // configuration of the observer:  
    var config = { subtree: true, childList: true };  

    // pass in the target node, as well as the observer options  
    observer.observe(target, config);  

}, false);