It seems like for years they've just been given default styling and inline display. Is there a spec somewhere that has dictated this? I've looked over the RFC's but I'm not particularly good with RFC-ese, and I didn't notice anything anywhere.For example<body>   Some content <mycustomtag>something else</mycustomtag> more content.</body>I can still style it with CSS, and the browser doesn't outright vomit... so it seems like there is some sort of expected behavior. Was that dictated by a specification?
Custom HTML Tags: Are there any specifications stating a standard way to handle them?
html;specifications;standards