Philippe Verdy wrote, > ... As well the newline don't need any font, it is synthetized by renderers.
It's true that fonts don't need to have glyphs mapped for control characters, but I'd hesitate to use any control character in a font's sample text field because of the field's intended use. But, we are being moot here since Peter has reminded that the fonts in question already have some BMP characters mapped, including certain punctuation characters. An ExtB font with BMP basic Latin could display the English language default sample text "The quick brown fox..." with no problem, but a non-English locale might substitute a default text string which the font could not support. So it's probably best to have *something* in that field respresenting characters the font covers.
