number-or-normal data type
The number-or-normal values can be either a decimal number or the string "normal". This is used by the line-height and letter-spacing attributes.
Where is this type used?
<accidental-text> — "letter-spacing" attribute
<accidental-text> — "line-height" attribute
<credit-symbol> — "letter-spacing" attribute
<credit-symbol> — "line-height" attribute
<credit-words> — "letter-spacing" attribute
<credit-words> — "line-height" attribute
<display-text> — "letter-spacing" attribute
<display-text> — "line-height" attribute
<footnote> — "letter-spacing" attribute
<footnote> — "line-height" attribute
<rehearsal> — "letter-spacing" attribute
<rehearsal> — "line-height" attribute
<symbol> — "letter-spacing" attribute
<symbol> — "line-height" attribute
<text> — "letter-spacing" attribute
<words> — "letter-spacing" attribute
<words> — "line-height" attribute