When will it be safe to attempt to implement the spec based solely on the formal specification statements in the spec?
It’s never truly safe; for example, if you tried to implement HTML4 according to the HTML4 specification you wouldn’t have an implementation compatible with HTML4-era documents. However, if you’re able to deal with minor changes, like security updates, errata-level changes, etc, then you can see which parts of the spec are stable and which are not from the status annotations in the left margin. In general, though, we would strongly recommend taking part in the development effort. There’s a mailing list for implementors which can help.
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