Fails indicate that the font property specification is invalid in strict mode.
24pt italic = 24pt
24pt italic Arial = 24pt
24pt italic 'Arial' = 24pt Arial
italic 24pt = fails
italic 24pt Arial = 24pt Arial Italic
italic 24pt 'Arial' = 24pt Arial Italic
Arial 24pt italic = fails
'Arial' 24pt italic = fails
Arial italic 24pt = fails
'Arial' italic 24pt = fails