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Description of problem: 
When saving a table in LibreOffice Writer as HTML, the <td> tags are generated with two "style" attributes which is invalid HTML. This causes the table border rules included with the second style attribute to be ignored by a browser such as Firefox.

Version-Release number of selected component (if applicable):
6.4.7.2-5.el8 (also 5.3.6.1-25.el7_9)

How reproducible: 100%


Steps to Reproduce:
1. Launch LibreOffice Writer
2. Create a table with any number of rows and columns from "Table" -> "Insert Table"
3. Highlight the table and at the bottom set a background color for the table
4. With the table still highlighted, ensure all borders are turned on
5. Select "File" -> "Send" -> "Create HTML Document" and save the file

Actual results:
HTML file has two "style" attributes within the <td> tag.

Expected results:
HTML file has one "style" attributes within the <td> tag, with all specified formatting present.

Additional info:
- Reported upstream in Document Foundation Bugzilla 132739, linked below.
- This is also present in RHEL 7.9, as mentioned in the package release above.

my proposed fix: https://gerrit.libreoffice.org/c/core/+/120393

I was able to reproduce this bug on 8.4z, an I can confirm this is fixed by libreoffice-writer-6.4.7.2-6.el8.x86_64.

export_html_duplicit_style_attrs

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Moderate: libreoffice security, bug fix, and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2022:1766