{"type":"rich","version":"1.0","title":"Polymer 2.4+\n\nExtend a base class template by including the base class template in your child class template\nwith `${super.template}`.","author_name":"katejeffreys","author_url":"https://plnkr.co/users/katejeffreys","provider_name":"Plunker","provider_url":"https://plnkr.co","html":"<iframe id=\"plnkr_embed_FDnI2u\" class=\"plnkr_embed_iframe\" style=\"width: 100%; overflow: hidden;\" src=\"https://embed.plnkr.co/plunk/FDnI2u?autoCloseSidebar&deferRun&show=preview\" width=\"600\" height=\"400\" frameborder=\"0\" scrolling=\"no\"></iframe>","width":600,"height":400,"thumbnail_url":"https://shot.plnkr.co/FDnI2u.png?d=2017-12-11T23%3A40%3A21.045Z","thumbnail_width":400,"thumbnail_height":300}