Owlkettle 2.0.0 is a declarative GUI framwork for GTK 4

[planetis]

Expanding on that karax uses different syntax for inline CSS:
    
    
    span(onclick = close, style={color: "#aaa",
          cssFloat: "right",
          fontSize: "28px",
          fontWeight: "bold"}):
    
    
    Run

it could be reused for properties.