diff --git a/components/config/opts.rs b/components/config/opts.rs
index 8fe8fb62d5da..64856866a866 100644
--- a/components/config/opts.rs
+++ b/components/config/opts.rs
@@ -32,10 +32,6 @@ pub struct Opts {
     /// The maximum size of each tile in pixels (`-s`).
     pub tile_size: usize,
 
-    /// The ratio of device pixels per px at the default scale. If unspecified, will use the
-    /// platform default setting.
-    pub device_pixels_per_px: Option<f32>,
-
     /// `None` to disable the time profiler or `Some` to enable it with:
     ///
     ///  - an interval in seconds to cause it to produce output on that interval.
@@ -524,7 +520,6 @@ pub fn default_opts() -> Opts {
         is_running_problem_test: false,
         url: None,
         tile_size: 512,
-        device_pixels_per_px: None,
         time_profiling: None,
         time_profiler_trace_path: None,
         mem_profiler_period: None,
@@ -587,7 +582,6 @@ pub fn from_cmdline_args(mut opts: Options, args: &[String]) -> ArgumentParsingR
     opts.optflag("g", "gpu", "GPU painting");
     opts.optopt("o", "output", "Output file", "output.png");
     opts.optopt("s", "size", "Size of tiles", "512");
-    opts.optopt("", "device-pixel-ratio", "Device pixels per px", "");
     opts.optflagopt(
         "p",
         "profile",
@@ -792,15 +786,6 @@ pub fn from_cmdline_args(mut opts: Options, args: &[String]) -> ArgumentParsingR
         None => 512,
     };
 
-    let device_pixels_per_px = opt_match.opt_str("device-pixel-ratio").map(|dppx_str| {
-        dppx_str.parse().unwrap_or_else(|err| {
-            args_fail(&format!(
-                "Error parsing option: --device-pixel-ratio ({})",
-                err
-            ))
-        })
-    });
-
     // If only the flag is present, default to a 5 second period for both profilers
     let time_profiling = if opt_match.opt_present("p") {
         match opt_match.opt_str("p") {
@@ -951,7 +936,6 @@ pub fn from_cmdline_args(mut opts: Options, args: &[String]) -> ArgumentParsingR
         is_running_problem_test: is_running_problem_test,
         url: url_opt,
         tile_size: tile_size,
-        device_pixels_per_px: device_pixels_per_px,
         time_profiling: time_profiling,
         time_profiler_trace_path: opt_match.opt_str("profiler-trace-path"),
         mem_profiler_period: mem_profiler_period,
diff --git a/components/constellation/constellation.rs b/components/constellation/constellation.rs
index 356f530d9ede..a819bd65a1b7 100644
--- a/components/constellation/constellation.rs
+++ b/components/constellation/constellation.rs
@@ -464,6 +464,10 @@ pub struct Constellation<Message, LTF, STF> {
 
     /// Mechanism to force the compositor to process events.
     event_loop_waker: Option<Box<dyn EventLoopWaker>>,
+
+    /// The ratio of device pixels per px at the default scale. If unspecified, will use the
+    /// platform default setting.
+    device_pixels_per_px: Option<f32>,
 }
 
 /// State needed to construct a constellation.
@@ -520,6 +524,10 @@ pub struct InitialConstellationState {
 
     /// Mechanism to force the compositor to process events.
     pub event_loop_waker: Option<Box<dyn EventLoopWaker>>,
+
+    /// The ratio of device pixels per px at the default scale. If unspecified, will use the
+    /// platform default setting.
+    pub device_pixels_per_px: Option<f32>,
 }
 
 /// Data needed for webdriver
@@ -837,6 +845,7 @@ where
                     glplayer_threads: state.glplayer_threads,
                     player_context: state.player_context,
                     event_loop_waker: state.event_loop_waker,
+                    device_pixels_per_px,
                 };
 
                 constellation.run();
@@ -1081,6 +1090,7 @@ where
             webxr_registry: self.webxr_registry.clone(),
             player_context: self.player_context.clone(),
             event_loop_waker: self.event_loop_waker.as_ref().map(|w| (*w).clone_box()),
+            device_pixels_per_px: self.device_pixels_per_px,
         });
 
         let pipeline = match result {
diff --git a/components/constellation/pipeline.rs b/components/constellation/pipeline.rs
index 373d48205296..2579343f3fe3 100644
--- a/components/constellation/pipeline.rs
+++ b/components/constellation/pipeline.rs
@@ -205,6 +205,10 @@ pub struct InitialPipelineState {
 
     /// Mechanism to force the compositor to process events.
     pub event_loop_waker: Option<Box<dyn EventLoopWaker>>,
+
+    /// The ratio of device pixels per px at the default scale. If unspecified, will use the
+    /// platform default setting.
+    pub device_pixels_per_px: Option<f32>,
 }
 
 pub struct NewPipeline {
@@ -312,6 +316,7 @@ impl Pipeline {
                     webvr_chan: state.webvr_chan,
                     webxr_registry: state.webxr_registry,
                     player_context: state.player_context,
+                    device_pixels_per_px: state.device_pixels_per_px,
                 };
 
                 // Spawn the child process.
@@ -518,6 +523,7 @@ pub struct UnprivilegedPipelineContent {
     webvr_chan: Option<IpcSender<WebVRMsg>>,
     webxr_registry: webxr_api::Registry,
     player_context: WindowGLContext,
+    device_pixels_per_px: Option<f32>,
 }
 
 impl UnprivilegedPipelineContent {
@@ -609,7 +615,7 @@ impl UnprivilegedPipelineContent {
             layout_thread_busy_flag.clone(),
             self.opts.load_webfonts_synchronously,
             self.opts.initial_window_size,
-            self.opts.device_pixels_per_px,
+            self.device_pixels_per_px,
             self.opts.dump_display_list,
             self.opts.dump_display_list_json,
             self.opts.dump_style_tree,
diff --git a/components/servo/lib.rs b/components/servo/lib.rs
index 7e8a6c1a438d..86920bbe3613 100644
--- a/components/servo/lib.rs
+++ b/components/servo/lib.rs
@@ -306,7 +306,11 @@ impl<Window> Servo<Window>
 where
     Window: WindowMethods + 'static + ?Sized,
 {
-    pub fn new(mut embedder: Box<dyn EmbedderMethods>, window: Rc<Window>) -> Servo<Window> {
+    pub fn new(
+        mut embedder: Box<dyn EmbedderMethods>,
+        window: Rc<Window>,
+        device_pixels_per_px: Option<f32>,
+    ) -> Servo<Window> {
         // Global configuration options, parsed from the command line.
         let opts = opts::get();
 
@@ -551,6 +555,7 @@ where
             webvr_constellation_sender,
             glplayer_threads,
             event_loop_waker,
+            device_pixels_per_px,
         );
 
         // Send the constellation's swmanager sender to service worker manager thread
@@ -582,7 +587,7 @@ where
             opts.is_running_problem_test,
             opts.exit_after_load,
             opts.convert_mouse_to_touch,
-            opts.device_pixels_per_px,
+            device_pixels_per_px,
         );
 
         Servo {
@@ -870,6 +875,7 @@ fn create_constellation(
     webvr_constellation_sender: Option<Sender<Sender<ConstellationMsg>>>,
     glplayer_threads: Option<GLPlayerThreads>,
     event_loop_waker: Option<Box<dyn EventLoopWaker>>,
+    device_pixels_per_px: Option<f32>,
 ) -> (Sender<ConstellationMsg>, SWManagerSenders) {
     // Global configuration options, parsed from the command line.
     let opts = opts::get();
@@ -912,6 +918,7 @@ fn create_constellation(
         glplayer_threads,
         player_context,
         event_loop_waker,
+        device_pixels_per_px,
     };
     let (constellation_chan, from_swmanager_sender) = Constellation::<
         script_layout_interface::message::Msg,
@@ -920,7 +927,7 @@ fn create_constellation(
     >::start(
         initial_state,
         opts.initial_window_size,
-        opts.device_pixels_per_px,
+        device_pixels_per_px,
         opts.random_pipeline_closure_probability,
         opts.random_pipeline_closure_seed,
         opts.is_running_problem_test,
diff --git a/ports/glutin/app.rs b/ports/glutin/app.rs
index 44c8d52e6a74..a43245d79a56 100644
--- a/ports/glutin/app.rs
+++ b/ports/glutin/app.rs
@@ -34,12 +34,18 @@ pub struct App {
 }
 
 impl App {
-    pub fn run(angle: bool, enable_vsync: bool, use_msaa: bool, no_native_titlebar: bool) {
+    pub fn run(
+        angle: bool,
+        enable_vsync: bool,
+        use_msaa: bool,
+        no_native_titlebar: bool,
+        device_pixels_per_px: Option<f32>,
+    ) {
         let events_loop = EventsLoop::new(opts::get().headless);
 
         // Implements window methods, used by compositor.
         let window = if opts::get().headless {
-            headless_window::Window::new(opts::get().initial_window_size)
+            headless_window::Window::new(opts::get().initial_window_size, device_pixels_per_px)
         } else {
             Rc::new(headed_window::Window::new(
                 opts::get().initial_window_size,
@@ -49,6 +55,7 @@ impl App {
                 enable_vsync,
                 use_msaa,
                 no_native_titlebar,
+                device_pixels_per_px,
             ))
         };
 
@@ -63,7 +70,7 @@ impl App {
         // Handle browser state.
         let browser = Browser::new(window.clone());
 
-        let mut servo = Servo::new(embedder, window.clone());
+        let mut servo = Servo::new(embedder, window.clone(), device_pixels_per_px);
         let browser_id = BrowserId::new();
         servo.handle_events(vec![WindowEvent::NewBrowser(get_default_url(), browser_id)]);
         servo.setup_logging();
diff --git a/ports/glutin/headed_window.rs b/ports/glutin/headed_window.rs
index 10c69ba59c64..dfaf980b6fb1 100644
--- a/ports/glutin/headed_window.rs
+++ b/ports/glutin/headed_window.rs
@@ -75,6 +75,7 @@ pub struct Window {
     enable_vsync: bool,
     use_msaa: bool,
     no_native_titlebar: bool,
+    device_pixels_per_px: Option<f32>,
 }
 
 #[cfg(not(target_os = "windows"))]
@@ -98,6 +99,7 @@ impl Window {
         enable_vsync: bool,
         use_msaa: bool,
         no_native_titlebar: bool,
+        device_pixels_per_px: Option<f32>,
     ) -> Window {
         let opts = opts::get();
 
@@ -210,6 +212,7 @@ impl Window {
             enable_vsync,
             use_msaa,
             no_native_titlebar,
+            device_pixels_per_px,
         };
 
         window.present();
@@ -329,7 +332,7 @@ impl Window {
     }
 
     fn servo_hidpi_factor(&self) -> Scale<f32, DeviceIndependentPixel, DevicePixel> {
-        match opts::get().device_pixels_per_px {
+        match self.device_pixels_per_px {
             Some(device_pixels_per_px) => Scale::new(device_pixels_per_px),
             _ => match opts::get().output_file {
                 Some(_) => Scale::new(1.0),
@@ -561,6 +564,7 @@ impl webxr::glwindow::GlWindow for Window {
             self.enable_vsync,
             self.use_msaa,
             self.no_native_titlebar,
+            self.device_pixels_per_px,
         ));
         app::register_window(window.clone());
         Ok(window)
diff --git a/ports/glutin/headless_window.rs b/ports/glutin/headless_window.rs
index 4b87915bb179..c0c5c1fabb09 100644
--- a/ports/glutin/headless_window.rs
+++ b/ports/glutin/headless_window.rs
@@ -5,12 +5,11 @@
 //! A headless window implementation.
 
 use crate::window_trait::WindowPortsMethods;
-use glutin;
 use euclid::{default::Size2D as UntypedSize2D, Point2D, Rotation3D, Scale, Size2D, UnknownUnit};
 use gleam::gl;
+use glutin;
 use servo::compositing::windowing::{AnimationState, WindowEvent};
 use servo::compositing::windowing::{EmbedderCoordinates, WindowMethods};
-use servo::servo_config::opts;
 use servo::servo_geometry::DeviceIndependentPixel;
 use servo::style_traits::DevicePixel;
 use servo::webrender_api::units::{DeviceIntRect, DeviceIntSize};
@@ -92,10 +91,14 @@ pub struct Window {
     animation_state: Cell<AnimationState>,
     fullscreen: Cell<bool>,
     gl: Rc<dyn gl::Gl>,
+    device_pixels_per_px: Option<f32>,
 }
 
 impl Window {
-    pub fn new(size: Size2D<u32, DeviceIndependentPixel>) -> Rc<dyn WindowPortsMethods> {
+    pub fn new(
+        size: Size2D<u32, DeviceIndependentPixel>,
+        device_pixels_per_px: Option<f32>,
+    ) -> Rc<dyn WindowPortsMethods> {
         let context = HeadlessContext::new(size.width, size.height, None);
         let gl = unsafe { gl::GlFns::load_with(|s| HeadlessContext::get_proc_address(s)) };
 
@@ -110,13 +113,14 @@ impl Window {
             gl,
             animation_state: Cell::new(AnimationState::Idle),
             fullscreen: Cell::new(false),
+            device_pixels_per_px,
         };
 
         Rc::new(window)
     }
 
     fn servo_hidpi_factor(&self) -> Scale<f32, DeviceIndependentPixel, DevicePixel> {
-        match opts::get().device_pixels_per_px {
+        match self.device_pixels_per_px {
             Some(device_pixels_per_px) => Scale::new(device_pixels_per_px),
             _ => Scale::new(1.0),
         }
@@ -133,9 +137,7 @@ impl WindowPortsMethods for Window {
     }
 
     fn id(&self) -> glutin::WindowId {
-        unsafe {
-            glutin::WindowId::dummy()
-        }
+        unsafe { glutin::WindowId::dummy() }
     }
 
     fn page_height(&self) -> f32 {
@@ -167,8 +169,7 @@ impl WindowMethods for Window {
 
     fn get_coordinates(&self) -> EmbedderCoordinates {
         let dpr = self.servo_hidpi_factor();
-        let size =
-            (Size2D::new(self.context.width, self.context.height).to_f32() * dpr).to_i32();
+        let size = (Size2D::new(self.context.width, self.context.height).to_f32() * dpr).to_i32();
         let viewport = DeviceIntRect::new(Point2D::zero(), size);
         let framebuffer = DeviceIntSize::from_untyped(size.to_untyped());
         EmbedderCoordinates {
@@ -223,7 +224,10 @@ impl webxr::glwindow::GlWindow for Window {
     fn swap_buffers(&self) {}
     fn size(&self) -> UntypedSize2D<gl::GLsizei> {
         let dpr = self.servo_hidpi_factor().get();
-        Size2D::new((self.context.width as f32 * dpr) as gl::GLsizei, (self.context.height as f32 * dpr) as gl::GLsizei)
+        Size2D::new(
+            (self.context.width as f32 * dpr) as gl::GLsizei,
+            (self.context.height as f32 * dpr) as gl::GLsizei,
+        )
     }
     fn new_window(&self) -> Result<Rc<dyn webxr::glwindow::GlWindow>, ()> {
         let width = self.context.width;
@@ -236,6 +240,7 @@ impl webxr::glwindow::GlWindow for Window {
             gl,
             animation_state: Cell::new(AnimationState::Idle),
             fullscreen: Cell::new(false),
+            device_pixels_per_px: self.device_pixels_per_px,
         }))
     }
     fn get_rotation(&self) -> Rotation3D<f32, UnknownUnit, UnknownUnit> {
diff --git a/ports/glutin/main2.rs b/ports/glutin/main2.rs
index c6aff92f5e06..b8d784db762d 100644
--- a/ports/glutin/main2.rs
+++ b/ports/glutin/main2.rs
@@ -96,6 +96,7 @@ pub fn main() {
     );
     opts.optflag("", "msaa", "Use multisample antialiasing in WebRender.");
     opts.optflag("b", "no-native-titlebar", "Do not use native titlebar");
+    opts.optopt("", "device-pixel-ratio", "Device pixels per px", "");
 
     let opts_matches;
     let content_process_token;
@@ -159,7 +160,14 @@ pub fn main() {
         opts_matches.opt_present("no-native-titlebar") || !(pref!(shell.native_titlebar.enabled));
     let enable_vsync = !opts_matches.opt_present("disable-vsync");
     let use_msaa = opts_matches.opt_present("msaa");
-    App::run(angle, enable_vsync, use_msaa, do_not_use_native_titlebar);
+    let device_pixels_per_px = opts_matches.opt_str("device-pixel-ratio").map(|dppx_str| {
+        dppx_str.parse().unwrap_or_else(|err| {
+            error!( "Error parsing option: --device-pixel-ratio ({})", err);
+            process::exit(1);
+        })
+    });
+
+    App::run(angle, enable_vsync, use_msaa, do_not_use_native_titlebar, device_pixels_per_px);
 
     platform::deinit(clean_shutdown)
 }
diff --git a/ports/libsimpleservo/api/src/lib.rs b/ports/libsimpleservo/api/src/lib.rs
index 97d22dba867c..57844593a95f 100644
--- a/ports/libsimpleservo/api/src/lib.rs
+++ b/ports/libsimpleservo/api/src/lib.rs
@@ -205,7 +205,7 @@ pub fn init(
         gl: gl.clone(),
     });
 
-    let servo = Servo::new(embedder_callbacks, window_callbacks.clone());
+    let servo = Servo::new(embedder_callbacks, window_callbacks.clone(), None);
 
     SERVO.with(|s| {
         let mut servo_glue = ServoGlue {