Add metasiteId to Wix site header

AddMetasiteIdToWixSiteHeader.user.js

// ==UserScript==
// @name         Add metaSiteId to Wix sites header
// @namespace    https://shmulikf.wixsite.com
// @version      0.1
// @description  Make it easy to get the metasiteId of a Wix site
// @author       Shmulik Flint
// @match        https://*.wixsite.com/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=wixsite.com
// @downloadURL  https://gist.githubusercontent.com/splintor/4c5191114b0a80d4309339635dd4b051/raw
// @updateURL    https://gist.githubusercontent.com/splintor/4c5191114b0a80d4309339635dd4b051/raw

// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    function addToHeader() {
        const header = document.getElementById('WIX_ADS');
        if (!header) {
            return;
        }

        if (document.getElementById('metaSiteIdElement')) {
            return;
        }

        let span = document.createElement("span");
        span.style.position = 'absolute';
        span.style.fontSize = '1.5em';
        span.style.margin = '13px';
        span.innerHTML = '<div id="metaSiteIdElement">metasiteId: ' + window.viewerModel.site.metaSiteId + '<a href="#" onclick="">Copy</a></div>';
        header.prepend(span);

        const link = document.querySelector('#metaSiteIdElement a');
        link.style.marginInlineStart = '7px';
        link.onclick = e => {
            e.preventDefault();
            e.stopPropagation();
            navigator.clipboard.writeText(window.viewerModel.site.metaSiteId);
            link.innerHTML = 'Copied!';
            setTimeout(() => { link.innerHTML = 'Copy'; }, 2000);
        }
    }

    addToHeader();
    const startInteval = setInterval(addToHeader, 100);
    setTimeout(() => clearInterval(startInteval), 8000);
})();