preceding the current item or null.
BackForwardList.getBackItem
webkit.back_forward_list_item.BackForwardListItem getBackItem() nothrowReturns the item that precedes the current item.
Returns
the #WebKitBackForwardListItem
webkit.back_forward_list_item.BackForwardListItem getBackItem() nothrowReturns the item that precedes the current item.
preceding the current item or null.