I have many (several hundred) SVG files that use the Arial font. All of them are saved from Microsoft Visio 2016 and used in my FrameMaker 2017 documentation.
My old laptop had both the Arial and Helvetica fonts installed. FrameMaker 2017 displayed the SVG files correctly on that laptop.
My new laptop has only Arial. Even though my SVG files do not use Helvetica (manually confirmed in the SVG source code), FrameMaker 2017 corrupts any use of the Arial font when displaying these SVG files. These same SVG files work fine in every other browser and viewer I have tried on my new laptop.
I eventually traced this to the fact that Arial is capitalized in the font-family definition inside the SVG file:
From the reading I've done, this is correct -- you capitalize the names of specific fonts, like Arial, but you lowercase general font families, like sans-serif.
Nevertheless, if I (incorrectly) lowercase Arial in my SVG file, then FrameMaker handles it properly:
Perhaps there is some ancient dusty code inside FrameMaker that is hardcoded to map uppercase Arial to Helvetica somewhere in its SVG processing pipeline? I don't know. I can't think of any other reason why SVG handling of Arial should be affected by the presence or absence of Helvetica.
Time for some ugly file post-processing workarounds.