Example code 14 of Web Word(2).js

// unwrap text nodes
wrappers.forEach(span => {
    if (span.parentElement) {
        const textNode = span.firstChild;
        span.removeChild(textNode);
        span.parentElement.insertBefore(textNode, span);
        span.parentElement.removeChild(span);
    }
});
// keep the cursor
if (range) {
    selection.removeAllRanges();
    selection.addRange(range);
}
paragraph.normalize();
nextParagraph.normalize();