Property

Most css properties will be expressed as tuples of anything that implements hobo::css::AppendProperty, which includes:

css::Property such as created by the css::<prop>() family of macros (e.g. css::width!(), css::flex_shrink!(), etc)
Vec<css::Property>
()
&'static str and String as escape hatches
FnOnce(&mut Vec<Property>) for rare complex logic
Other tuples of things that implement hobo::css::AppendProperty
Enum-like property variants e.g. css::Display::Flex or css::TextDecorationStyle::Solid

Conditional property inclusion could be expressed as different Vec<css::Property> where one is empty, e.g.

(
    css::display!(flex),
    if active {
        vec![css::background_color!(0x00_00_FF_FF)],
    } else {
        vec![],
    },
)

Or alternatively, by leveraging FnOnce

(
    css::display!(flex),
    move |props| if active { props.push(css::background_color!(0x00_00_FF_FF)); },
)

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