hasGlyphs
is only available for flash target.
For html5 target, if font doesn’t have glyphs it uses system font.
But how to do it for iOS target to use system font, if current for cannot render glyph?
You can use the absolute path to a system font on native targets and it should work, though we should have code that supports a fallback to standard _sans, _serif or _typewriter fonts when another font is not available