How to get rid of style="height: 100%;" in initial <html> tag?

Although neither my index.html nor my unit specific html files contain this height style, the finally produced html contains.

<!DOCTYPE html>
<html style="height: 100%;">

This disturbs the concept of our web designer.

How can this unwanted style be removed?

Many thanks,

Set Form.ElementClassName to a value different from empty string.

Thank you Bruno. That did it. Is that a bug or a feature?

When no external CSS class is used, we force it to ensure the browser window is always filled.