code: public Elements wrap(String html) {
          Validate.notEmpty(html);
          for (Element element : this) {
              element.wrap(html);
          }
          return this;
      }
docs: Wrap the supplied HTML around each matched elements. For example, with HTML
  {@code <p><b>This</b> is <b>Jsoup</b></p>},
  <code>doc.select("b").wrap("&lt;i&gt;&lt;/i&gt;");</code>
  becomes {@code <p><i><b>This</b></i> is <i><b>jsoup</b></i></p>}
  @param html HTML to wrap around each element, e.g. {@code <div class="head"></div>}. Can be arbitrarily deep.
  @return this (for chaining)
  @see Element#wrap