diff --git a/components/style/build.rs b/components/style/build.rs
index c33d3aaf6cb..46270c02112 100644
--- a/components/style/build.rs
+++ b/components/style/build.rs
@@ -3,10 +3,7 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 use std::env;
-use std::fs::File;
-use std::io::Write;
-use std::path::Path;
-use std::process::{Command, Stdio, exit};
+use std::process::{Command, exit};
 
 #[cfg(windows)]
 fn find_python() -> String {
@@ -31,25 +28,13 @@ fn find_python() -> String {
 }
 
 fn main() {
-    let python = match env::var("PYTHON") {
-        Ok(python_path) => python_path,
-        Err(_) => find_python(),
-    };
-    let style = Path::new(file!()).parent().unwrap();
-    let mako = style.join("Mako-0.9.1.zip");
-    let template = style.join("properties.mako.rs");
+    let python = env::var("PYTHON").ok().unwrap_or_else(find_python);
     let product = if cfg!(feature = "gecko") { "gecko" } else { "servo" };
-    let result = Command::new(python)
-        .env("PYTHONPATH", &mako)
-        .env("TEMPLATE", &template)
-        .env("PRODUCT", product)
-        .arg("generate_properties_rs.py")
-        .stderr(Stdio::inherit())
-        .output()
+    let status = Command::new(python)
+        .args(&["generate_properties_rs.py", product, "rust"])
+        .status()
         .unwrap();
-    if !result.status.success() {
+    if !status.success() {
         exit(1)
     }
-    let out = env::var("OUT_DIR").unwrap();
-    File::create(&Path::new(&out).join("properties.rs")).unwrap().write_all(&result.stdout).unwrap();
 }
diff --git a/components/style/generate_properties_rs.py b/components/style/generate_properties_rs.py
index eceae10c28c..48fa0298a37 100644
--- a/components/style/generate_properties_rs.py
+++ b/components/style/generate_properties_rs.py
@@ -2,16 +2,67 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-import os
+import json
+import os.path
+import re
 import sys
 
+BASE = os.path.dirname(__file__)
+sys.path.insert(0, os.path.join(BASE, "Mako-0.9.1.zip"))
+
 from mako import exceptions
 from mako.template import Template
 
-try:
-    template = Template(open(os.environ['TEMPLATE'], 'rb').read(),
-                        input_encoding='utf8')
-    print(template.render(PRODUCT=os.environ['PRODUCT']).encode('utf8'))
-except:
-    sys.stderr.write(exceptions.text_error_template().render().encode('utf8'))
+
+def main():
+    usage = "Usage: %s [ servo | gecko ] [ rust | html ]" % sys.argv[0]
+    if len(sys.argv) < 3:
+        abort(usage)
+    product = sys.argv[1]
+    output = sys.argv[2]
+    if product not in ["servo", "gecko"] or output not in ["rust", "html"]:
+        abort(usage)
+
+    template, rust = render("properties.mako.rs", PRODUCT=product)
+    if output == "rust":
+        write(os.environ["OUT_DIR"], "properties.rs", rust)
+    elif output == "html":
+        write_html(template)
+
+
+def abort(message):
+    sys.stderr.write(message + b"\n")
     sys.exit(1)
+
+
+def render(name, **context):
+    try:
+        template = Template(open(os.path.join(BASE, name), "rb").read(), input_encoding="utf8")
+        return template, template.render(**context).encode("utf8")
+    except:
+        abort(exceptions.text_error_template().render().encode("utf8"))
+
+
+def write(directory, filename, content):
+    if not os.path.exists(directory):
+        os.makedirs(directory)
+    open(os.path.join(directory, filename), "wb").write(content)
+
+
+def write_html(template):
+    properties = dict(
+        (p.name, {
+            "flag": p.experimental,
+            "shorthand": hasattr(p, "sub_properties")
+        })
+        for p in template.module.LONGHANDS + template.module.SHORTHANDS
+    )
+    _, html = render("properties.html.mako", properties=properties)
+
+    doc_servo = os.path.join(BASE, "..", "..", "target", "doc", "servo")
+    write(doc_servo, "css-properties.json", json.dumps(properties, indent=4))
+    write(doc_servo, "css-properties.html", html)
+
+
+if __name__ == "__main__":
+    main()
diff --git a/components/style/list_properties.py b/components/style/list_properties.py
deleted file mode 100644
index 78c6b84f2c4..00000000000
--- a/components/style/list_properties.py
+++ /dev/null
@@ -1,41 +0,0 @@
-#!/usr/bin/env python
-
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-import os.path
-import sys
-import json
-
-style = os.path.dirname(__file__)
-sys.path.insert(0, os.path.join(style, "Mako-0.9.1.zip"))
-from mako.template import Template
-
-template = Template(filename=os.path.join(style, "properties.mako.rs"), input_encoding='utf8')
-template.render(PRODUCT='servo')
-properties = dict(
-    (p.name, {
-        "flag": p.experimental,
-        "shorthand": hasattr(p, "sub_properties")
-    })
-    for p in template.module.LONGHANDS + template.module.SHORTHANDS
-)
-
-json_dump = json.dumps(properties, indent=4)
-
-#
-# Resolve path to doc directory and write CSS properties and JSON.
-#
-servo_doc_path = os.path.abspath(os.path.join(style, '../', '../', 'target', 'doc', 'servo'))
-
-# Ensure ./target/doc/servo exists
-if not os.path.exists(servo_doc_path):
-    os.makedirs(servo_doc_path)
-
-with open(os.path.join(servo_doc_path, 'css-properties.json'), "w") as out_file:
-    out_file.write(json_dump)
-
-html_template = Template(filename=os.path.join(style, "properties.html.mako"), input_encoding='utf8')
-with open(os.path.join(servo_doc_path, 'css-properties.html'), "w") as out_file:
-    out_file.write(html_template.render(properties=properties))
diff --git a/etc/ci/upload_docs.sh b/etc/ci/upload_docs.sh
index 2aea0fcea00..6141e3cb599 100755
--- a/etc/ci/upload_docs.sh
+++ b/etc/ci/upload_docs.sh
@@ -12,7 +12,7 @@ cd "$(dirname $0)/../.."
 # etc/doc.servo.org/index.html overwrites $(mach rust-root)/doc/index.html
 cp etc/doc.servo.org/* target/doc/
 
-python components/style/list_properties.py
+python components/style/build_properties_rs.py servo html
 
 ghp-import -n target/doc
 git push -qf https://${TOKEN}@github.com/servo/doc.servo.org.git gh-pages
diff --git a/python/servo/testing_commands.py b/python/servo/testing_commands.py
index 66a2da5be3e..ef5d59c0d3d 100644
--- a/python/servo/testing_commands.py
+++ b/python/servo/testing_commands.py
@@ -141,20 +141,7 @@ class MachCommands(CommandBase):
     @CommandArgument('test_name', nargs=argparse.REMAINDER,
                      help="Only run tests that match this pattern or file path")
     def test_unit(self, test_name=None, package=None):
-        subprocess.check_output([
-            sys.executable,
-            path.join(self.context.topdir, "components", "style", "list_properties.py")
-        ])
-
-        this_file = os.path.dirname(__file__)
-        servo_doc_path = os.path.abspath(os.path.join(this_file, '../', '../', 'target', 'doc', 'servo'))
-
-        with open(os.path.join(servo_doc_path, 'css-properties.json'), 'r') as property_file:
-            properties = json.loads(property_file.read())
-
-        assert len(properties) >= 100
-        assert "margin-top" in properties
-        assert "margin" in properties
+        check_css_properties_json(self.context.topdir)
 
         if test_name is None:
             test_name = []
@@ -670,3 +657,21 @@ testing/web-platform/mozilla/tests for Servo-only tests""" % reference_path)
 
         if editor:
             proc.wait()
+
+
+def check_css_properties_json(topdir):
+    filename = path.join(topdir, "target", "doc", "servo", "css-properties.json")
+
+    if path.exists(filename):
+        os.remove(filename)
+    subprocess.check_call([
+        sys.executable,
+        path.join(topdir, "components", "style", "build_properties_rs.py"),
+        "servo",
+        "html",
+    ])
+    properties = json.load(open(filename))
+
+    assert len(properties) >= 100
+    assert "margin-top" in properties
+    assert "margin" in properties