> Why is it needed at all? We have HTML, we have an agreed upon governance for it. For my selfish reasons, so I can write a competing browser that only accepts

> Why is it needed at all? We have HTML, we have an agreed upon governance for it. For my selfish reasons, so I can write a competing browser that only accepts that format. While I want the spec smaller and more strict for selfish reasons (ease of implementation), it has bonus value for performance use cases. Also, there is value for devs to signify that they are attempting to conform to a certain specification (i.e. the purpose of a doctype). Sans validation the value is less, but still, having a simplified spec subset for web pages at least lets the community/ecosystem grow around it.