Problem setting table headers in rich-text

The rich text editor has Table Row Properties and Table Cell Properties buttons that open a window with options to set the Row Type and Cell Type, respectively. One of the options is Header but when it's used and the table saved, the cell contents are moved out of the table and into a paragraph above the table.

The problem is not with the WYSIWYG editor per se, the same thing occurs if you disable the rich-text editor and manually change the elements from to . is not in the list of allowed HTML tags so the solution may be as simple as adding to the allowed list.

BTW, using proper table header elements for column and row headers (vs. simply styling them differently) is very helpful for making tablet contents accessible.
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