HTML creator

function newTagEl(parent, tag, attr, ...content) {
    const element = document.createElement(tag);
    for (const key in attr) {
        element[key] = attr[key];
    }
    for (let entry of content) {
        if (typeof entry == 'string' || typeof entry == 'number') {
            entry = document.createTextNode(entry);
        }
        element.appendChild(entry);
    }

    if(parent){
        parent.appendChild(element)
    }
    return element;
}