Run the test. No interaction required.
Support for SVG Fonts is required for this test, and the last two text
strings are used to give a quick visual indication this is indeed
supported.
The test shows 24 different text strings with different combinations
of altGlyphItem element count and validity inside the altGlyphDef
elements, and number of characters in the altGlyph elements. The
glyphs are from a sans serif font, except those selected by
altGlyph, which are from a boldface serif font. The text
in the "Actual" columns should appear as shown in the corresponding
"Expected" column text.
