Module cascade 

CSS cascade & inheritance.

Walks the BoxTree and propagates inheritable properties from parent to child when the child has not specified them. Properties not in the inheritable list are left untouched (initial values applied at paint time).

Inheritable properties (per CSS spec, restricted to our scope):

• color
• font-family
• font-size
• font-weight
• font-style
• line-height
• letter-spacing
• text-align
• white-space
• overflow-wrap
• visibility
• text-decoration (not strictly inheritable but used as such here)

All other properties (background, padding, border, transform, etc.) are NOT inherited.

Functions

inherit_from

Inherit unset child properties from the parent. parent is the already resolved style (post-cascade) of the parent node.