Debug CSS

A script to show outline of all the element exist on page. (origin: Debug-CSS Firefox Extension)
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// ==UserScript==
// @name         Debug CSS 
// @version      1.0
// @encoding     utf-8
// @description  A script to show outline of all the element exist on page. (origin: Debug-CSS Firefox Extension)
// @author       Hamadah2O2 | Pranay Joshi
// @license      MIT
// @match        *://*/*
// @run-at       document-end
// @namespace https://greasyfork.org/users/1500331
// ==/UserScript==

const debugCSS = document.createElement("style");
debugCSS.id = "debugCSS";

debugCSS.textContent = `
body{outline:1px solid #2980b9!important}article{outline:1px solid #3498db!important}nav{outline:1px solid #0088c3!important}aside{outline:1px solid #33a0ce!important}section{outline:1px solid #66b8da!important}header{outline:1px solid #99cfe7!important}footer{outline:1px solid #cce7f3!important}h1{outline:1px solid #162544!important}h2{outline:1px solid #314e6e!important}h3{outline:1px solid #3e5e85!important}h4{outline:1px solid #449baf!important}h5{outline:1px solid #c7d1cb!important}h6{outline:1px solid #4371d0!important}main{outline:1px solid #2f4f90!important}address{outline:1px solid #1a2c51!important}div{outline:1px solid #036cdb!important}p{outline:1px solid #ac050b!important}hr{outline:1px solid #ff063f!important}pre{outline:1px solid #850440!important}blockquote{outline:1px solid #f1b8e7!important}ol{outline:1px solid #ff050c!important}ul{outline:1px solid #d90416!important}li{outline:1px solid #d90416!important}dl{outline:1px solid #fd3427!important}dt{outline:1px solid #ff0043!important}dd{outline:1px solid #e80174!important}figure{outline:1px solid #f0b!important}figcaption{outline:1px solid #bf0032!important}table{outline:1px solid #0c9!important}caption{outline:1px solid #37ffc4!important}thead{outline:1px solid #98daca!important}tbody{outline:1px solid #64a7a0!important}tfoot{outline:1px solid #22746b!important}tr{outline:1px solid #86c0b2!important}th{outline:1px solid #a1e7d6!important}td{outline:1px solid #3f5a54!important}col{outline:1px solid #6c9a8f!important}colgroup{outline:1px solid #6c9a9d!important}button{outline:1px solid #da8301!important}datalist{outline:1px solid #c06000!important}fieldset{outline:1px solid #d95100!important}form{outline:1px solid #d23600!important}input{outline:1px solid #fca600!important}keygen{outline:1px solid #b31e00!important}label{outline:1px solid #ee8900!important}legend{outline:1px solid #de6d00!important}meter{outline:1px solid #e8630c!important}optgroup{outline:1px solid #b33600!important}option{outline:1px solid #ff8a00!important}output{outline:1px solid #ff9619!important}progress{outline:1px solid #e57c00!important}select{outline:1px solid #e26e0f!important}textarea{outline:1px solid #cc5400!important}details{outline:1px solid #33848f!important}summary{outline:1px solid #60a1a6!important}command{outline:1px solid #438da1!important}menu{outline:1px solid #449da6!important}del{outline:1px solid #bf0000!important}ins{outline:1px solid #400000!important}img{outline:1px solid #22746b!important}iframe{outline:1px solid #64a7a0!important}embed{outline:1px solid #98daca!important}object{outline:1px solid #0c9!important}param{outline:1px solid #37ffc4!important}video{outline:1px solid #6ee866!important}audio{outline:1px solid #027353!important}source{outline:1px solid #012426!important}canvas{outline:1px solid #a2f570!important}track{outline:1px solid #59a600!important}map{outline:1px solid #7be500!important}area{outline:1px solid #305900!important}a{outline:1px solid #ff62ab!important}em{outline:1px solid #800b41!important}strong{outline:1px solid #ff1583!important}i{outline:1px solid #803156!important}b{outline:1px solid #cc1169!important}u{outline:1px solid #ff0430!important}s{outline:1px solid #f805e3!important}small{outline:1px solid #d107b2!important}abbr{outline:1px solid #4a0263!important}q{outline:1px solid #240018!important}cite{outline:1px solid #64003c!important}dfn{outline:1px solid #b4005a!important}sub{outline:1px solid #dba0c8!important}sup{outline:1px solid #cc0256!important}time{outline:1px solid #d6606d!important}code{outline:1px solid #e04251!important}kbd{outline:1px solid #5e001f!important}samp{outline:1px solid #9c0033!important}var{outline:1px solid #d90047!important}mark{outline:1px solid #ff0053!important}bdi{outline:1px solid #bf3668!important}bdo{outline:1px solid #6f1400!important}ruby{outline:1px solid #ff7b93!important}rt{outline:1px solid #ff2f54!important}rp{outline:1px solid #803e49!important}span{outline:1px solid #cc2643!important}br{outline:1px solid #db687d!important}wbr{outline:1px solid #db175b!important}article:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}nav:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}aside:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}section:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}header:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}footer:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}h1:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}h2:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}h3:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}h4:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}h5:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}h6:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}main:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}address:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}div:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}p:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}hr:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}pre:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}blockquote:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}ol:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}ul:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}li:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}dl:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}dt:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}dd:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}figure:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}figcaption:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}table:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}caption:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}thead:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}tbody:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}tfoot:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}tr:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}th:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}td:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}col:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}colgroup:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}button:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}datalist:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}fieldset:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}form:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}input:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}keygen:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}label:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}legend:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}meter:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}optgroup:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}option:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}output:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}progress:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}select:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}textarea:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}details:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}summary:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}command:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}menu:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}del:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}ins:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}img:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}iframe:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}embed:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}object:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}param:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}video:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}audio:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}source:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}canvas:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}track:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}map:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}area:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}a:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}em:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}strong:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}i:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}b:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}u:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}s:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}small:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}abbr:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}q:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}cite:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}dfn:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}sub:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}sup:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}time:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}code:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}kbd:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}samp:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}var:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}mark:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}bdi:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}bdo:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}ruby:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}rt:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}rp:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}span:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}br:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}wbr:hover{-webkit-box-shadow:0 0 1rem rgba(0,0,0,.6);box-shadow:0 0 1rem rgba(0,0,0,.6);}
#debugCSSInfoBar {visibility:hidden; position: fixed; bottom: 0; width: 100%; padding: 20px 0; margin:0; background-color: #333; color: #eee; font-size: 16px; text-align: center; outline: none !important;-webkit-box-shadow:none !important;box-shadow:none !important;}
#debugCSSInfoBar.show{visibility:visible;}
#debugCSSInfoBar p {font-family: monospace; font-size: 16px; padding: 0; margin: 0; outline: none !important;-webkit-box-shadow:none !important;box-shadow:none !important;background-color:inherit !important;}
#debugCSSInfoBar b {color:#0088C3;outline: none !important;-webkit-box-shadow:none !important;box-shadow:none !important;background-color:inherit !important}
`;

var infoBar = "";

function toggleDebugCSS() {
    if (document.getElementById("debugCSS")) {
        document
            .getElementsByTagName("head")[0]
            .removeChild(document.getElementById("debugCSS"));
        document
            .getElementsByTagName("body")[0]
            .removeChild(document.getElementById("debugCSSInfoBar"));
        infoBar = "";
    } else {
        document.head.appendChild(debugCSS);
        initInfoBar();
    }
}

function initInfoBar() {
    debugCSSInfoBar = document.createElement("div");
    debugCSSInfoBar.id = "debugCSSInfoBar";
    debugCSSInfoBar.innerHTML = "<p>Hold Ctrl Key & hover on any element for detail</p>";
    document.body.appendChild(debugCSSInfoBar);
    infoBar = document.getElementById("debugCSSInfoBar");
}

function updateInfoBar(e) {
    if (!infoBar) return;
    var n = e.target.id.toString() || "",
        t = e.target.classList.toString() || "",
        o = e.target.nodeName.toLowerCase() || "";
    if (!infoBar) return;
    document.getElementById("debugCSSInfoBar").innerHTML = "<p>Hovered Element Detail(s)= { Element Type: <b> " + o + "</b>; Class(es) Applied: <b> " + t + "</b>; Element Id: <b> " + n + "</b>; }</p>";
}

function showInfoBar(e) {
    if (!infoBar) return;
    infoBar.className = "";
    if (e.ctrlKey && e.type == "keydown") infoBar.className = "show";
}

(function() {
    "use strict";
    document.addEventListener("keydown", (e) => {
        if (e.key.toLowerCase() === "c" && e.altKey && e.shiftKey) {
            toggleDebugCSS();
        }
    });
    document.addEventListener("mouseover", updateInfoBar);
    document.addEventListener("keydown", showInfoBar);
    document.addEventListener("keyup", showInfoBar);
})();