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styles -- and formats in general -- are currently associated to individual visual elements. This makes it possible to modify the style of a given fragment without having to take into account other styles that may apply to it indirectly (e.g. via a container element). This simplifies the style editor's UI since there is a one-to-one relation between elements and styles (edit a given element, and you have directly access to all its style properties)
also when a fragment is moved between cells it is expected that the fragment's style is preserved. So for lots of reasons we don't want to deal with implicit style inheritance as in CSS.
but in certain cases it is useful to be able to assign common style properties to more than one element (e.g. link colors, font styles, ... ) through inheritance.
in the current implementation one element can only have one style, but styles could inherit from other styles.
example:
fragment1 __ has style __ style1
style1 __inherits from__ style2
then fragment1 will also have the styles of style2, with the possibility for style2 to override some of the properties of style1
in HTML we simply write:
<div class="style2 style1">fragment1</div>
in the UI, inherited properties can be marked in italic, and a button can say "this style inherits from ..."
there is then an inheritance chain that can be followed. Finally this is similar to inheritance in CSS with the difference that inheritance is here explicit and completely independent of containment.
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