Thus, a website with many photos may take some time to download and can cause a site to lose visitors
. For listing, the pictures come with an alt tag to be easily explored by the robots of search engines. Designers must respect certain principles to ensure that websites are accessible. For example, it is advisable to use semantic markup, so the site can have a significant structure. Furthermore, it should also be required semantic web, so that other web services can easily recognize them on different web pages.