document.addEventListener('DOMContentLoaded', function() { if ('MutationObserver' in window) { const config = { attributes: false, childList: true, subtree: false, } function onElementAdded(mutationsList, observer) { for (const mutation of mutationsList) { if (mutation.type === 'childList') { if (mutation.addedNodes.length > 0) { for (const node of mutation.addedNodes) { if (node.nodeName.toLowerCase() === 'canvas') { node.focus(); if (window.focusHandler) { window.focusHandler.disconnect() delete window.focusHandler } return } } } } } } window.focusHandler = new MutationObserver(onElementAdded) window.focusHandler.observe(document.body, config) } })