[VE][73] Error Message Feedback

If there is no <title>Some title<title> in the document, why not simply indicate this straightforwardly instead of bringing up this rather confusing (not direct, not straightforward) message:

{
end tag for "HEAD" which is not finished

Most likely, You nested tags and closed them in the wrong order. For example <p><em>...</p> is not acceptable, as <em> must be closed before <p>. Acceptable nesting is: <p><em>...</em></p>

Another possibility is that you used an element (e.g. 'ul') which requires a child element (e.g. 'li') that you did not include. Hence the parent element is "not finished", not complete.
}

How about something like: 

<title>...</title> missing in HEAD block. 

The title element is required in the HEAD block of HTML documents.

Gérard Talbot