contentHeight(h) {
    var content = this.content || this.document.body;

    if (h && Object(_utils_core__WEBPACK_IMPORTED_MODULE_1__["isNumber"])(h)) {
      h = h + "px";
    }

    if (h) {
      content.style.height = h;
    }

    return parseInt(this.window.getComputedStyle(content)["height"]);
  }
Get or Set height of the contents
@param {number} [h]
@returns {number} height