replaceTags.js

// remove hard spaces
let bodyHTML = document.body.innerHTML;
bodyHTML = bodyHTML.replace(/ /gim, ' ');
bodyHTML = bodyHTML.replace(/\u00a0/gim, ' ');  //  
bodyHTML = bodyHTML.replace('  ', ' ');
bodyHTML = bodyHTML.replace(/<[^/>]+>[ \n\r\t]*<\/[^>]+>/gim, ''); // remove empry tags
bodyHTML = bodyHTML.replace(/,([^ ])/gim, ', $1'); // fixes commas not followed by space
//bodyHTML = bodyHTML.replace(/”([^ ])/gim, '” $1'); // fixes  not followed by space
//bodyHTML = bodyHTML.replace(/\.([^ <\d])/gim, '\. $1');  // fixes dot stops not followed by space
//bodyHTML = bodyHTML.replace(/\:([^ ])/gim, '\: $1'); 
//bodyHTML = bodyHTML.replace(/\;([^ ])/gim, '\; $1');
document.body.innerHTML = bodyHTML;

const linker = (accumulator, link) => accumulator + link.outerHTML;

function replaceTags(query, newTag, exeptions, strip) {
    let newEle = null;
    let eleHTML = '';
    let links = [];
    let linksHTML = '';
    let newDom = null;
    let [tag, tagClass] = newTag.split('.')

    let elements = document.querySelectorAll(query)
    for (ele of elements) {
        newEle = document.createElement(tag);
        if (ele.id !== '') {
            newEle.id = ele.id;
        }
        if (tagClass !== undefined) {
            newEle.className = tagClass
        }
        if (strip !== undefined) {
            newEle.innerHTML = ele.innerHTML
        } else {
            eleHTML = ele.innerHTML
            links = Array.from(ele.querySelectorAll(exeptions))
            if (links.length == 0) {
                linksHTML = ''
            } else {
                linksHTML = links.reduce(linker)
            }
            newEle.innerHTML = ele.textContent + linksHTML
        }

        if (newEle.innerHTML == '') {
            newDom = ele.parentNode.replaceChild(document.createTextNode(" "), ele);
            //newDom = ele.parentNode.removeChild( ele);
        } else {
            newDom = ele.parentNode.replaceChild(newEle, ele);
        }        
    }
}

let replace = [
    ['p.Tittle', 'h2', 'a'],
    ['p.Podtyt-', 'h3.subtitle', 'a'],
    ['span.char-style-override-14', 'em'],
    ['p.Podtyt-2', 'h3', 'a'],
    ['p.podtyt-3', 'h4', 'a'],
    ['p.podtyt4', 'h5', 'a'],
    ['p.tekst2', 'p.colofon', false],
    ['p.Normal', 'p', '', false],
    ['p.tekst', 'p', '', false], 
    ['p.tekst1', 'p.opening', '', false],
    
    ['p.tibetan', 'p.tibetan', 'a', false]
]

for (toReplace of replace) 
    replaceTags(...toReplace)