ConstNumeric representation for bold as it is typically used in
browsers.
Numeric representation for bolder. Value equals a typical value
for bolder in computedStyleMap() when parent has
font-weight bold.
Numeric representation for lighter. Value equals a typical value
for lighter in computedStyleMap() when parent has
font-weight normal.
Numeric representation for normal as it is typically used in
browsers.
Some simplistic assumptions on font-weight by key-word.
This map is just meant for a rough decision on bold/non-bold, as the relative weight mapping ignores the required parent context for correct transformation.