code: function addData(element, key, value) {
          if (value === undefined) {
              return element && element.h5s && element.h5s.data && element.h5s.data[key];
          }
          else {
              element.h5s = element.h5s || {};
              element.h5s.data = element.h5s.data || {};
              element.h5s.data[key] = value;
          }
      }
docs: Get or set data on element
  @param {HTMLElement} element
  @param {string} key
  @param {any} value
  @return {*}