The HTML-entity for code 185 is "¹" (as ONE) and not "&supl" (as L). Ancient versions of Internet Explorer had this bug.
The current webviewer in FileMaker 12 cannot render this HTML-entity.
GetAsCSS ( Char ( 185 ))
I could substitute "&supl" with "¹" after GetAsCSS().
Thank you for the post.
I replicated this on my work station running FileMaker Pro 12v3 installed on Mac OS X 10.7.5 and Windows 7 using the steps provided. This was the same behavior in FileMaker Pro 11. I forwarded your report and a sample file to Testing and Development for review.