[[*css:htmlToHead:notempty=``]]
(with the TV 'css' set to 'tag { foo: bar;}'
<head>
....
<style id="csstv">tag { foo: bar; }</style>
</head>
This question has been answered by sottwell. See the first response.
'id' => empty($params['tagid']) ? null : $domId, /* 'tv' already added to id */
That EXACTLY did the trick! THANK YOU, SUSAN!
Ok, found it, obviously enough it's htmltag.class.php. I see the problem.
Line 24 should be
'id' => empty($params['tagid']) ? null : $domId, /* 'tv' already added to id */