Trust is a good thing, but control is a better one.
Now I have reduced the head section one step further: to 0. This also functions.
Not in any visible or perceptible aspect, this version is different on the ereader from the full parallel version (apart of the stylesheet.css instructions, of course).
Direct html <i> or also <i class="calibre4"> tags are considered.
Code:
<?xml version='1.0' encoding='utf-8'?>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
</head>
Check Book: Warning: The file stylesheet.css is not referenced