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jerone / April Fools CSS

// ==UserScript==
// @name             April Fools CSS
// @description      Some CSS april fools
// @author           jerone
// @namespace        https://github.com/jerone/UserScripts/tree/master/April_Fools_CSS
// @copyright        2014+, jerone (https://github.com/jerone)
// @license          CC-BY-NC-SA-4.0; https://creativecommons.org/licenses/by-nc-sa/4.0/legalcode
// @license          GPL-3.0-or-later; http://www.gnu.org/licenses/gpl-3.0.txt
// @supportURL       https://github.com/jerone/UserScripts/issues
// @contributionURL  https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=VCYMHWQ7ZMBKW
// @include          *
// @version          1.0
// ==/UserScript==

// cSpell:ignore transform, aprilfool
/* eslint security/detect-object-injection: "off" */

if (window.top === window) {
	var duration = 2000, // [Integer, positive, milliseconds] This controls the duration of an april fool item;
		interval = 8000; // [Integer, positive, milliseconds] This controls the interval of the next april fool;

	// [String] April fools in CSS; Use {duration} for a dynamic duration;
	var aprilFools = [
			// editorconfig-checker-disable
			"img {										\
				-webkit-transform: rotate(180deg);		\
				   -moz-transform: rotate(180deg);		\
				    -ms-transform: rotate(180deg);		\
				     -o-transform: rotate(180deg);		\
				        transform: rotate(180deg);		\
			}",
			"body {										\
				-webkit-transform: rotate(1deg);		\
				   -moz-transform: rotate(1deg);		\
				    -ms-transform: rotate(1deg);		\
				     -o-transform: rotate(1deg);		\
				        transform: rotate(1deg);		\
			}",
			"body {										\
				-webkit-perspective: 300px; 			\
				   -moz-perspective: 300px; 			\
				    -ms-perspective: 300px; 			\
					    perspective: 300px;				\
				-webkit-transform: rotateY(180deg);		\
				   -moz-transform: rotateY(180deg);		\
				    -ms-transform: rotateY(180deg);		\
					    transform: rotateY(180deg);		\
				-webkit-transform-style: preserve-3d;	\
				   -moz-transform-style: preserve-3d;	\
				    -ms-transform-style: preserve-3d;	\
					    transform-style: preserve-3d;	\
			}",
			"img {										\
				-webkit-transform: scale(0.8); 			\
				   -moz-transform: scale(0.8); 			\
				    -ms-transform: scale(0.8); 			\
				     -o-transform: scale(0.8); 			\
					transform: scale(0.8); 				\
			}",
			"img { -webkit-animation: spin {duration}s linear infinite; }	\
			@-webkit-keyframes spin {										\
				  0% { -webkit-transform: rotate(0deg); }					\
				100% { -webkit-transform: rotate(360deg); }					\
			}",
			"body { -webkit-animation: rainbow {duration}s infinite; }		\
			@-webkit-keyframes rainbow {									\
				100% { -webkit-filter: hue-rotate(360deg); }				\
			}",
			// editorconfig-checker-enable
		],
		aprilFool = 0,
		aprilFooled = 0;

	interval = Math.abs(interval);
	duration = Math.max(1000, Math.abs(duration));

	window.setInterval(
		function () {
			do {
				aprilFool = Math.floor(Math.random() * aprilFools.length);
			} while (aprilFool === aprilFooled);
			document.documentElement.classList.add(
				"aprilfool" + (aprilFooled = aprilFool),
			);
			window.console && console.log("added aprilfool" + aprilFool);
			window.setTimeout(function () {
				document.documentElement.classList.remove(
					"aprilfool" + aprilFooled,
				);
				window.console && console.log("removed aprilfool" + aprilFool);
			}, duration);
		},
		interval + duration + 10,
	);

	for (var aprilFoolText in aprilFools) {
		GM_addStyle(
			".aprilfool" +
				aprilFoolText +
				" " +
				aprilFools[aprilFoolText].replace(
					"{duration}",
					duration / 1000,
				),
		);
	}
}