Default isBold decision based on font-weight. For any font-weight
greater than 400 (or bold/bolder) it will signal bold. For any
font-weight less than or equal to 400 (or normal/lighter) it will
signal non-bold. For undetermined state by font-weight assumeBold
will be returned unchanged.
Param: assumeBold
if up to now we assume bold state
Param: fontWeight
font-weight retrieved and parsed from CSSStyleDeclaration
Default
isBolddecision based on font-weight. For any font-weight greater than 400 (orbold/bolder) it will signal bold. For any font-weight less than or equal to 400 (ornormal/lighter) it will signal non-bold. For undetermined state by font-weightassumeBoldwill be returned unchanged.