How to preserve subscripts when saving html as doc?

English
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#1

When saving a html file as doc in LibreOffice Writer, the subscripts and superscript fonts are enlarged.

The first one is a html document (H2O) saved as doc and opened as a doc file. The second is H2O written in the doc format.

How to keep the original formatting of subscripts and superscripts when saving a html file in another format?

#2

You should better share files, not just a screenshot.

#3

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