I've started to think, user style sheets appear pretty much only
useful for modifying the default styling brought by UA style sheets,
given the current cascading order [1] rules. Cases where one wants
to override author styling involve using !important rules which in
my experience get effect in much more than the desired places.
Compensating for this involves greater digging into and
understanding of the author styles (which could be quite big and not
easy to read), and finally causes adding bunch of "unrelated" rules
to the user style sheet.
Especially with the introduction of the @-moz-document rules, one
usually targets at overriding few specific author declarations, but
placing !important in the user style sheet often makes it override
other more specific author rules which one may don't really want to.
For example, the web page author has supplied:
.important {
color: red;
}
.important:hover {
color: green;
}
.important.other {
color: blue;
}
and the user style sheet contains:
.important {
color: inherit !important;
font-weight: bold;
}
This makes all '.important' rules have their 'color' overridden.
While this could be the intention, also, it is more often I want to
modify just the first rule I've identified by short inspection, and
I don't want to dig further to restore the effect of other rules
I've overridden undesirably.
Does it make sense to allow user styles/style sheets to specify they
want to be treated as author ones instead of user ones in the
cascading order? Example:
@cascade author;
/* The following rules will be added to the "author" stack. */
or:
@-moz-document cascade(author) url(...) {
/* The rules in this block will be added to the "author" stack. */
}
Or does this appear detail which is better handled by the way UAs
provide style customization capabilities to users, e.g. if the
Stylish extension [2] provided an option whether specific styles
should be added as user style sheet, or just added to the
page/author style sheets.
[1] http://www.w3.org/TR/CSS2/cascade.html#cascading-order
[2] https://addons.mozilla.org/addon/stylish/
--
Stanimir
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