I open in libreoffice HTML-files. It removes for example the tag < sup data=“abc” >*< /sup >. How can I prevent deleting those tags that I need?
LibreOffice is not an HTML editor. It imports something from HTML that it can understand, and when you save as HTML, it tries to convert its data to HTML. The two conversions (at import and at export) are like translating a poem from one language to another, then back to the first one, by someone barely speaking the first language.
If you need to work with HTML, better find another, better suited application.
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