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Use case is filling an iframe[seamless].srcdoc with template.innerHTML. I want to override the <body> an iframe creates by default. With the seamless attribute, the styles bleed through from the parent frame so the frame inherits the body styles defined in the parent. Thus, there's no way to override them in the iframe. Here's an example: http://jsbin.com/akuhob/3/edit
Changing the category: From: WebAppsWG => Components Model To: WHATWG => HTML
Seems this is old feedback about the original design, not against the current specification.