Function azul_core::display_list::populate_css_properties

pub fn populate_css_properties(
    rect: &mut DisplayRectangle, 
    node_id: NodeId, 
    css_overrides: &BTreeMap<NodeId, FastHashMap<DomString, CssProperty>>, 
    styled_node: &StyledNode
) -> Vec<OverrideWarning>

Populate the style properties of the DisplayRectangle, apply static / dynamic properties