Auto-generate CSSStyleDeclaration.webidl for CSS properties based on the style crate

components/style/Cargo.toml

@@ -8,7 +8,7 @@ publish = false
 build = "build.rs"
 
 # https://github.com/rust-lang/cargo/issues/3544
-links = "for some reason the links key is required to pass data around between build scripts"
+links = "servo_style_crate"
 
 [lib]
 name = "style"

components/style/properties/build.py

@@ -94,6 +94,15 @@ def main():
             template = os.path.join(BASE, "gecko.mako.rs")
             rust = render(template, data=properties)
             write(OUT_DIR, "gecko_properties.rs", rust)
+
+        if product == "servo":
+            names_and_prefs = [
+                (prop.name, prop.servo_pref)
+                for p in properties.longhands + properties.shorthands
+                if p.enabled_in_content()
+                for prop in [p] + p.alias
+            ]
+            write(OUT_DIR, "css_properties.json", json.dumps(names_and_prefs, indent=4))
     elif output == "geckolib":
         if len(sys.argv) < 4:
             abort(usage)