https://pianetaqueer.it/templates/beez5/javascript/md_stylechanger.js

1/*global window, localStorage, fontSizeTitle, bigger, reset, smaller, biggerTitle, resetTitle, smallerTitle, Cookie */
2var prefsLoaded = false;
3var defaultFontSize = 100;
4var currentFontSize = defaultFontSize;
5var fontSizeTitle;
6var bigger;
7var smaller;
8var reset;
9var biggerTitle;
10var smallerTitle;
11var resetTitle;
12
13Object.append(Browser.Features, {
14	localstorage: (function() {
15		return ('localStorage' in window) && window.localStorage !== null;
16	})()
17});
18
19function setFontSize(fontSize) {
20	document.body.style.fontSize = fontSize + '%';
21}
22
23function changeFontSize(sizeDifference) {
24	currentFontSize = parseInt(currentFontSize, 10) + parseInt(sizeDifference * 5, 10);
25	if (currentFontSize > 180) {
26		currentFontSize = 180;
27	} else if (currentFontSize < 60) {
28		currentFontSize = 60;
29	}
30	setFontSize(currentFontSize);
31}
32
33function revertStyles() {
34	currentFontSize = defaultFontSize;
35	changeFontSize(0);
36}
37
38function writeFontSize(value) {
39	if (Browser.Features.localstorage) {
40		localStorage.fontSize = value;
41	} else {
42		Cookie.write("fontSize", value, {duration: 180});
43	}
44}
45
46function readFontSize() {
47	if (Browser.Features.localstorage) {
48		return localStorage.fontSize;
49	} else {
50		return Cookie.read("fontSize");
51	}
52}
53
54function setUserOptions() {
55	if (!prefsLoaded) {
56		var size = readFontSize();
57		currentFontSize = size ? size : defaultFontSize;
58		setFontSize(currentFontSize);
59		prefsLoaded = true;
60	}
61}
62
63function addControls() {
64	var container = document.id('fontsize');
65	var content = '<h3>'+ fontSizeTitle +'</h3><p><a title="'+ biggerTitle +'"  href="#" onclick="changeFontSize(2); return false">'+ bigger +'</a><span class="unseen">.</span><a href="#" title="'+resetTitle+'" onclick="revertStyles(); return false">'+ reset +'</a><span class="unseen">.</span><a href="#"  title="'+ smallerTitle +'" onclick="changeFontSize(-2); return false">'+ smaller +'</a></p>';
66	container.set('html', content);
67}
68
69function saveSettings() {
70	writeFontSize(currentFontSize);
71}
72
73window.addEvent('domready', setUserOptions);
74window.addEvent('domready', addControls);
75window.addEvent('unload', saveSettings);