X Ray JS

const xray = document.createElement('style'); xray.innerHTML = "*{background:#000!important;color:#0f0!important;outline:solid #f00 1px!important;}"; const xraysInPage = [...document.body.getElementsByTagName("style")].filter(style => style.innerHTML === xray.innerHTML); if(xraysInPage.length > 0) { xraysInPage.forEach(style => document.body.removeChild(style)); } else { document.body.appendChild(xray) }