ToHTML of ApiDocument: can't convert correctly when document contain char '<' or '>'

[zhangyehong]

This issue is unique.

• I have used the search tool and did not find an issue describing my bug.

Operating System of DocumentServer

Docker

Version information

9.0

Expected Behavior

When convert a word document to html in plugin,code like the following:
const doc=Api.GetDocument();
const html=doc.ToHTML();
two bugs:
(1) if the document contain char:'<' or '>', these two chars must be converted to html Escape Characters
(2) if the document contain superscript​ , it must be convert to

Actual Behavior

(1) the conversion keep there two chars unchanged
(2) for superscript conversion: it convert to tag

Reproduction Steps

No response

Additional information

No response

[zhangyehong]

sorry occur html escape problem here, for (2) must be converted to tag <sup> ,the actual is converted to tag <sub>,