Your html code should look like:

<!DOCTYPE HTML PUBLIC 
"-//W3C//DTD HTML 4.01 Transitional//EN" 
"http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>
</head>
<body>
</body>
</html>

To insert title, meta and link as children of head using innerHTML you can use:

Sub innerHTMLChildren123()
   Dim strHTMLTitle As String
   Dim strHTMLMeta As String
   Dim strHTMLLink As String
   Dim objHead As IHTMLElement
   
   Set objHead = ActiveDocument.all.tags("head").Item(0)
   
   strHTMLLink = _
   vbCrLf & _
   vbTab & _
   "<link>"
   
   strHTMLMeta = _
   vbCrLf & _
   vbTab & _
   "<meta>"
   
   strHTMLTitle = _
   vbCrLf & _
   vbTab & _
   "<title>" & _
   vbCrLf & _
   vbTab & _
   "</title>"
   
   objHead.innerHTML = strHTMLTitle
      
   objHead.innerHTML = _
   objHead.innerHTML & _
   strHTMLMeta
   
   objHead.innerHTML = _
   objHead.innerHTML & _
   strHTMLLink
   
End Sub

After

   objHead.innerHTML = strHTMLTitle

The HTML will be:

<!DOCTYPE HTML PUBLIC 
"-//W3C//DTD HTML 4.01 Transitional//EN" 
"http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>
	<title>
	</title>
</head>
<body>
</body>
</html>

After

   objHead.innerHTML = _
   objHead.innerHTML & _
   strHTMLMeta

The HTML will be:

<!DOCTYPE HTML PUBLIC 
"-//W3C//DTD HTML 4.01 Transitional//EN" 
"http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>
<title>
	</title>
	<meta>
</head>
<body>
</body>
</html>

After

   objHead.innerHTML = _
   objHead.innerHTML & _
   strHTMLLink

Your HTML code will be:

<!DOCTYPE HTML PUBLIC 
"-//W3C//DTD HTML 4.01 Transitional//EN" 
"http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>
<title>
	</title>
	<meta>
	<link>
</head>
<body>
</body>
</html>

Other methods to accomplish the same thing:

innerHTML, all 3 children at once

innerHTML, Child3, Child2, Child1

innerHTML, Child1, Child3, Child2 using innerHTML

innerHTML, Child1, Child2, Child3 using outerHTML

insertAdjacentHTML "beforeBegin, strHTML

insertAdjacentHTML "afterBegin, strHTML

insertAdjacentHTML "beforeEnd, strHTML

insertAdjacentHTML "afterEnd, strHTML

 

Valid XHTML 1.0 Transitional        Valid CSS!