Function createElement

third_party/subscriptions-project/swg.js:3698–3715

* Create a new element on document with specified tagName and attributes. * @param {!Document} doc * @param {string} tagName * @param {!Object } attributes * @param {?(string|!Node|!ArrayLike<!Node>|!Array<!Node>)=} content * @return {!Element} created element.

(doc, tagName, attributes, content)

 * @return {!Element} created element.
 */
function createElement(doc, tagName, attributes, content) {
  const element = doc.createElement(tagName);
  addAttributesToElement(element, attributes);
  if (content != null) {
    if (typeof content == 'string') {
      element.textContent = content;
    } else if (content.nodeType) {
      element.appendChild(/** @type {!Node} */ (content));
    } else if ('length' in content) {
      for (let i = 0; i < content.length; i++) {
        element.appendChild(content[i]);
      }
    } else {
      assert(false, 'Unsupported content: %s', content);
    }
  }
  return element;
}

/**
 * Removes the element.