When exporting as PDF for web it is default to only embed uncommon fonts.
I have recently exported a file for web using Arial and, when viewing on iOS devices (possibly Android also), the "i" is missing each time it is after an "f" ...a kerning issue.
Before, I only noticed that it effects font styles, but this is annoying. Couldn't it be default to embed all fonts in this situation? Otherwise I need to remember to switch it in the extra settings on export.