Script: removed a few opts::get()

17 files changed, 238 insertions, 45 deletions

diff --git a/components/config/opts.rs b/components/config/opts.rs
index 02075af7189..49fa0fee344 100644
--- a/components/config/opts.rs
+++ b/components/config/opts.rs
@@ -66,7 +66,7 @@ pub struct Opts {
 
     pub output_file: Option<String>,
 
-    /// Replace unpaires surrogates in DOM strings with U+FFFD.
+    /// Replace unpaired surrogates in DOM strings with U+FFFD.
     /// See <https://github.com/servo/servo/issues/6564>
     pub replace_surrogates: bool,
 
diff --git a/components/constellation/pipeline.rs b/components/constellation/pipeline.rs
index 4cc4462a4ca..3c1ebd7896a 100644
--- a/components/constellation/pipeline.rs
+++ b/components/constellation/pipeline.rs
@@ -559,6 +559,17 @@ impl UnprivilegedPipelineContent {
                 layout_is_busy: layout_thread_busy_flag.clone(),
             },
             self.load_data.clone(),
+            self.opts.profile_script_events,
+            self.opts.print_pwm,
+            self.opts.relayout_event,
+            self.opts.output_file.is_some() ||
+                self.opts.exit_after_load ||
+                self.opts.webdriver_port.is_some(),
+            self.opts.unminify_js,
+            self.opts.userscripts,
+            self.opts.headless,
+            self.opts.replace_surrogates,
+            self.opts.user_agent,
         );
 
         LTF::create(
diff --git a/components/script/dom/bindings/trace.rs b/components/script/dom/bindings/trace.rs
index b690687d034..97d440de4a0 100644
--- a/components/script/dom/bindings/trace.rs
+++ b/components/script/dom/bindings/trace.rs
@@ -109,6 +109,7 @@ use servo_media::streams::MediaStreamType;
 use servo_media::webrtc::WebRtcController;
 use servo_url::{ImmutableOrigin, MutableOrigin, ServoUrl};
 use smallvec::SmallVec;
+use std::borrow::Cow;
 use std::cell::{Cell, RefCell, UnsafeCell};
 use std::collections::{BTreeMap, HashMap, HashSet, VecDeque};
 use std::hash::{BuildHasher, Hash};
@@ -164,6 +165,8 @@ unsafe_no_jsmanaged_fields!(TexDataType, TexFormat);
 
 unsafe_no_jsmanaged_fields!(*mut JobQueue);
 
+unsafe_no_jsmanaged_fields!(Cow<'static, str>);
+
 /// Trace a `JSVal`.
 pub fn trace_jsval(tracer: *mut JSTracer, description: &str, val: &Heap<JSVal>) {
     unsafe {
diff --git a/components/script/dom/characterdata.rs b/components/script/dom/characterdata.rs
index 54f3ab0e360..87aa8bd59fa 100644
--- a/components/script/dom/characterdata.rs
+++ b/components/script/dom/characterdata.rs
@@ -24,7 +24,6 @@ use crate::dom::processinginstruction::ProcessingInstruction;
 use crate::dom::text::Text;
 use crate::dom::virtualmethods::vtable_for;
 use dom_struct::dom_struct;
-use servo_config::opts;
 use std::cell::Ref;
 
 // https://dom.spec.whatwg.org/#characterdata
@@ -122,11 +121,16 @@ impl CharacterDataMethods for CharacterData {
 
     // https://dom.spec.whatwg.org/#dom-characterdata-substringdata
     fn SubstringData(&self, offset: u32, count: u32) -> Fallible<DOMString> {
+        let replace_surrogates = self
+            .upcast::<Node>()
+            .owner_doc()
+            .window()
+            .replace_surrogates();
         let data = self.data.borrow();
         // Step 1.
         let mut substring = String::new();
         let remaining;
-        match split_at_utf16_code_unit_offset(&data, offset) {
+        match split_at_utf16_code_unit_offset(&data, offset, replace_surrogates) {
             Ok((_, astral, s)) => {
                 // As if we had split the UTF-16 surrogate pair in half
                 // and then transcoded that to UTF-8 lossily,
@@ -139,7 +143,7 @@ impl CharacterDataMethods for CharacterData {
             // Step 2.
             Err(()) => return Err(Error::IndexSize),
         }
-        match split_at_utf16_code_unit_offset(remaining, count) {
+        match split_at_utf16_code_unit_offset(remaining, count, replace_surrogates) {
             // Steps 3.
             Err(()) => substring = substring + remaining,
             // Steps 4.
@@ -176,11 +180,16 @@ impl CharacterDataMethods for CharacterData {
     fn ReplaceData(&self, offset: u32, count: u32, arg: DOMString) -> ErrorResult {
         let mut new_data;
         {
+            let replace_surrogates = self
+                .upcast::<Node>()
+                .owner_doc()
+                .window()
+                .replace_surrogates();
             let data = self.data.borrow();
             let prefix;
             let replacement_before;
             let remaining;
-            match split_at_utf16_code_unit_offset(&data, offset) {
+            match split_at_utf16_code_unit_offset(&data, offset, replace_surrogates) {
                 Ok((p, astral, r)) => {
                     prefix = p;
                     // As if we had split the UTF-16 surrogate pair in half
@@ -194,7 +203,7 @@ impl CharacterDataMethods for CharacterData {
             };
             let replacement_after;
             let suffix;
-            match split_at_utf16_code_unit_offset(remaining, count) {
+            match split_at_utf16_code_unit_offset(remaining, count, replace_surrogates) {
                 // Steps 3.
                 Err(()) => {
                     replacement_after = "";
@@ -305,7 +314,11 @@ impl LayoutCharacterDataHelpers for LayoutDom<CharacterData> {
 /// Note that the third variant is only ever returned when the `-Z replace-surrogates`
 /// command-line option is specified.
 /// When it *would* be returned but the option is *not* specified, this function panics.
-fn split_at_utf16_code_unit_offset(s: &str, offset: u32) -> Result<(&str, Option<char>, &str), ()> {
+fn split_at_utf16_code_unit_offset(
+    s: &str,
+    offset: u32,
+    replace_surrogates: bool,
+) -> Result<(&str, Option<char>, &str), ()> {
     let mut code_units = 0;
     for (i, c) in s.char_indices() {
         if code_units == offset {
@@ -315,7 +328,7 @@ fn split_at_utf16_code_unit_offset(s: &str, offset: u32) -> Result<(&str, Option
         code_units += 1;
         if c > '\u{FFFF}' {
             if code_units == offset {
-                if opts::get().replace_surrogates {
+                if replace_surrogates {
                     debug_assert_eq!(c.len_utf8(), 4);
                     return Ok((&s[..i], Some(c), &s[i + c.len_utf8()..]));
                 }
diff --git a/components/script/dom/dissimilaroriginwindow.rs b/components/script/dom/dissimilaroriginwindow.rs
index b66db40da3b..54523bb59ea 100644
--- a/components/script/dom/dissimilaroriginwindow.rs
+++ b/components/script/dom/dissimilaroriginwindow.rs
@@ -62,6 +62,8 @@ impl DissimilarOriginWindow {
                 // FIXME(nox): The microtask queue is probably not important
                 // here, but this whole DOM interface is a hack anyway.
                 global_to_clone_from.microtask_queue().clone(),
+                global_to_clone_from.is_headless(),
+                global_to_clone_from.get_user_agent(),
             ),
             window_proxy: Dom::from_ref(window_proxy),
             location: Default::default(),
diff --git a/components/script/dom/globalscope.rs b/components/script/dom/globalscope.rs
index 7bd0e28be6a..385939000bc 100644
--- a/components/script/dom/globalscope.rs
+++ b/components/script/dom/globalscope.rs
@@ -58,6 +58,7 @@ use profile_traits::{mem as profile_mem, time as profile_time};
 use script_traits::{MsDuration, ScriptToConstellationChan, TimerEvent};
 use script_traits::{TimerEventId, TimerSchedulerMsg, TimerSource};
 use servo_url::{MutableOrigin, ServoUrl};
+use std::borrow::Cow;
 use std::cell::Cell;
 use std::collections::hash_map::Entry;
 use std::collections::HashMap;
@@ -157,6 +158,12 @@ pub struct GlobalScope {
     /// <https://html.spec.whatwg.org/multipage/#outstanding-rejected-promises-weak-set>
     #[ignore_malloc_size_of = "mozjs"]
     consumed_rejections: DomRefCell<Vec<Box<Heap<*mut JSObject>>>>,
+
+    /// True if headless mode.
+    is_headless: bool,
+
+    /// An optional string allowing the user agent to be set for testing.
+    user_agent: Cow<'static, str>,
 }
 
 impl GlobalScope {
@@ -171,6 +178,8 @@ impl GlobalScope {
         timer_event_chan: IpcSender<TimerEvent>,
         origin: MutableOrigin,
         microtask_queue: Rc<MicrotaskQueue>,
+        is_headless: bool,
+        user_agent: Cow<'static, str>,
     ) -> Self {
         Self {
             eventtarget: EventTarget::new_inherited(),
@@ -193,6 +202,8 @@ impl GlobalScope {
             event_source_tracker: DOMTracker::new(),
             uncaught_rejections: Default::default(),
             consumed_rejections: Default::default(),
+            is_headless,
+            user_agent,
         }
     }
 
@@ -799,6 +810,14 @@ impl GlobalScope {
         }
         unreachable!();
     }
+
+    pub fn is_headless(&self) -> bool {
+        self.is_headless
+    }
+
+    pub fn get_user_agent(&self) -> Cow<'static, str> {
+        self.user_agent.clone()
+    }
 }
 
 fn timestamp_in_ms(time: Timespec) -> u64 {
diff --git a/components/script/dom/htmlscriptelement.rs b/components/script/dom/htmlscriptelement.rs
index 369f43b6019..4325add0212 100644
--- a/components/script/dom/htmlscriptelement.rs
+++ b/components/script/dom/htmlscriptelement.rs
@@ -38,7 +38,6 @@ use net_traits::request::{
 use net_traits::{FetchMetadata, FetchResponseListener, Metadata, NetworkError};
 use net_traits::{ResourceFetchTiming, ResourceTimingType};
 use servo_atoms::Atom;
-use servo_config::opts;
 use servo_url::ServoUrl;
 use std::cell::Cell;
 use std::fs::File;
@@ -533,7 +532,7 @@ impl HTMLScriptElement {
     }
 
     fn unminify_js(&self, script: &mut ClassicScript) {
-        if !opts::get().unminify_js {
+        if !self.parser_document.window().unminify_js() {
             return;
         }
 
diff --git a/components/script/dom/navigator.rs b/components/script/dom/navigator.rs
index 8a5524b437b..8a0f6a21d98 100644
--- a/components/script/dom/navigator.rs
+++ b/components/script/dom/navigator.rs
@@ -103,7 +103,7 @@ impl NavigatorMethods for Navigator {
 
     // https://html.spec.whatwg.org/multipage/#dom-navigator-useragent
     fn UserAgent(&self) -> DOMString {
-        navigatorinfo::UserAgent()
+        navigatorinfo::UserAgent(self.global().get_user_agent())
     }
 
     // https://html.spec.whatwg.org/multipage/#dom-navigator-appversion
diff --git a/components/script/dom/navigatorinfo.rs b/components/script/dom/navigatorinfo.rs
index 117bfce87c1..0ebb9043765 100644
--- a/components/script/dom/navigatorinfo.rs
+++ b/components/script/dom/navigatorinfo.rs
@@ -3,7 +3,7 @@
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
 use crate::dom::bindings::str::DOMString;
-use servo_config::opts;
+use std::borrow::Cow;
 
 pub fn Product() -> DOMString {
     DOMString::from("Gecko")
@@ -53,8 +53,8 @@ pub fn Platform() -> DOMString {
     DOMString::from("iOS")
 }
 
-pub fn UserAgent() -> DOMString {
-    DOMString::from(&*opts::get().user_agent)
+pub fn UserAgent(user_agent: Cow<'static, str>) -> DOMString {
+    DOMString::from(&*user_agent)
 }
 
 pub fn AppVersion() -> DOMString {
diff --git a/components/script/dom/permissions.rs b/components/script/dom/permissions.rs
index e7d3b600814..87dc88636da 100644
--- a/components/script/dom/permissions.rs
+++ b/components/script/dom/permissions.rs
@@ -21,8 +21,6 @@ use dom_struct::dom_struct;
 use js::conversions::ConversionResult;
 use js::jsapi::{JSContext, JSObject};
 use js::jsval::{ObjectValue, UndefinedValue};
-#[cfg(target_os = "linux")]
-use servo_config::opts;
 use servo_config::pref;
 use std::rc::Rc;
 #[cfg(target_os = "linux")]
@@ -269,14 +267,15 @@ impl PermissionAlgorithm for Permissions {
             // Step 3.
             PermissionState::Prompt => {
                 let perm_name = status.get_query();
-                // https://w3c.github.io/permissions/#request-permission-to-use (Step 3 - 4)
-                let state = prompt_user(&format!(
-                    "{} {} ?",
-                    REQUEST_DIALOG_MESSAGE,
-                    perm_name.clone()
-                ));
 
                 let globalscope = GlobalScope::current().expect("No current global object");
+
+                // https://w3c.github.io/permissions/#request-permission-to-use (Step 3 - 4)
+                let state = prompt_user(
+                    &format!("{} {} ?", REQUEST_DIALOG_MESSAGE, perm_name.clone()),
+                    globalscope.is_headless(),
+                );
+
                 globalscope
                     .as_window()
                     .permission_state_invocation_results()
@@ -322,10 +321,11 @@ pub fn get_descriptor_permission_state(
                 .permission_state_invocation_results()
                 .borrow_mut()
                 .remove(&permission_name.to_string());
-            prompt_user(&format!(
-                "The {} {}",
-                permission_name, NONSECURE_DIALOG_MESSAGE
-            ))
+
+            prompt_user(
+                &format!("The {} {}", permission_name, NONSECURE_DIALOG_MESSAGE),
+                settings.is_headless(),
+            )
         }
     };
 
@@ -351,8 +351,8 @@ pub fn get_descriptor_permission_state(
 }
 
 #[cfg(target_os = "linux")]
-fn prompt_user(message: &str) -> PermissionState {
-    if opts::get().headless {
+fn prompt_user(message: &str, headless: bool) -> PermissionState {
+    if headless {
         return PermissionState::Denied;
     }
     match tinyfiledialogs::message_box_yes_no(
@@ -367,7 +367,7 @@ fn prompt_user(message: &str) -> PermissionState {
 }
 
 #[cfg(not(target_os = "linux"))]
-fn prompt_user(_message: &str) -> PermissionState {
+fn prompt_user(_message: &str, _headless: bool) -> PermissionState {
     // TODO popup only supported on linux
     PermissionState::Denied
 }
diff --git a/components/script/dom/userscripts.rs b/components/script/dom/userscripts.rs
index 1ba79ac5b69..af7c2b6d3f1 100644
--- a/components/script/dom/userscripts.rs
+++ b/components/script/dom/userscripts.rs
@@ -8,17 +8,16 @@ use crate::dom::globalscope::GlobalScope;
 use crate::dom::htmlheadelement::HTMLHeadElement;
 use crate::dom::node::document_from_node;
 use js::jsval::UndefinedValue;
-use servo_config::opts;
 use std::fs::{read_dir, File};
 use std::io::Read;
 use std::path::PathBuf;
 
 pub fn load_script(head: &HTMLHeadElement) {
-    let path_str = match opts::get().userscripts.clone() {
+    let doc = document_from_node(head);
+    let path_str = match doc.window().get_userscripts_path() {
         Some(p) => p,
         None => return,
     };
-    let doc = document_from_node(head);
     let win = Trusted::new(doc.window());
     doc.add_delayed_task(task!(UserScriptExecute: move || {
         let win = win.root();
diff --git a/components/script/dom/window.rs b/components/script/dom/window.rs
index ed87fa5e949..a1afdc34a82 100644
--- a/components/script/dom/window.rs
+++ b/components/script/dom/window.rs
@@ -106,9 +106,9 @@ use script_traits::{ConstellationControlMsg, DocumentState, LoadData};
 use script_traits::{ScriptMsg, ScriptToConstellationChan, ScrollState, TimerEvent, TimerEventId};
 use script_traits::{TimerSchedulerMsg, WindowSizeData, WindowSizeType};
 use selectors::attr::CaseSensitivity;
-use servo_config::opts;
 use servo_geometry::{f32_rect_to_au_rect, MaxRect};
 use servo_url::{Host, ImmutableOrigin, MutableOrigin, ServoUrl};
+use std::borrow::Cow;
 use std::borrow::ToOwned;
 use std::cell::Cell;
 use std::collections::hash_map::Entry;
@@ -299,6 +299,24 @@ pub struct Window {
     /// Flag that indicates if the layout thread is busy handling a request.
     #[ignore_malloc_size_of = "Arc<T> is hard"]
     layout_is_busy: Arc<AtomicBool>,
+
+    /// Emits notifications when there is a relayout.
+    relayout_event: bool,
+
+    /// True if it is safe to write to the image.
+    prepare_for_screenshot: bool,
+
+    /// Unminify Javascript.
+    unminify_js: bool,
+
+    /// Where to load userscripts from, if any. An empty string will load from
+    /// the resources/user-agent-js directory, and if the option isn't passed userscripts
+    /// won't be loaded.
+    userscripts_path: Option<String>,
+
+    /// Replace unpaired surrogates in DOM strings with U+FFFD.
+    /// See <https://github.com/servo/servo/issues/6564>
+    replace_surrogates: bool,
 }
 
 impl Window {
@@ -450,6 +468,18 @@ impl Window {
     pub fn get_webrender_api_sender(&self) -> RenderApiSender {
         self.webrender_api_sender.clone()
     }
+
+    pub fn get_userscripts_path(&self) -> Option<String> {
+        self.userscripts_path.clone()
+    }
+
+    pub fn replace_surrogates(&self) -> bool {
+        self.replace_surrogates
+    }
+
+    pub fn unminify_js(&self) -> bool {
+        self.unminify_js
+    }
 }
 
 // https://html.spec.whatwg.org/multipage/#atob
@@ -1402,7 +1432,7 @@ impl Window {
         let (join_chan, join_port) = unbounded();
 
         // On debug mode, print the reflow event information.
-        if opts::get().relayout_event {
+        if self.relayout_event {
             debug_reflow_events(
                 self.upcast::<GlobalScope>().pipeline_id(),
                 &reflow_goal,
@@ -1540,11 +1570,7 @@ impl Window {
         // When all these conditions are met, notify the constellation
         // that this pipeline is ready to write the image (from the script thread
         // perspective at least).
-        if (opts::get().output_file.is_some() ||
-            opts::get().exit_after_load ||
-            opts::get().webdriver_port.is_some()) &&
-            for_display
-        {
+        if self.prepare_for_screenshot && for_display {
             let document = self.Document();
 
             // Checks if the html element has reftest-wait attribute present.
@@ -1704,7 +1730,7 @@ impl Window {
         assert!(self.document.get().is_none());
         assert!(document.window() == self);
         self.document.set(Some(&document));
-        if !opts::get().unminify_js {
+        if !self.unminify_js {
             return;
         }
         // Create a folder for the document host to store unminified scripts.
@@ -2043,6 +2069,13 @@ impl Window {
         webrender_document: DocumentId,
         webrender_api_sender: RenderApiSender,
         layout_is_busy: Arc<AtomicBool>,
+        relayout_event: bool,
+        prepare_for_screenshot: bool,
+        unminify_js: bool,
+        userscripts_path: Option<String>,
+        is_headless: bool,
+        replace_surrogates: bool,
+        user_agent: Cow<'static, str>,
     ) -> DomRoot<Self> {
         let layout_rpc: Box<dyn LayoutRPC + Send> = {
             let (rpc_send, rpc_recv) = unbounded();
@@ -2065,6 +2098,8 @@ impl Window {
                 timer_event_chan,
                 origin,
                 microtask_queue,
+                is_headless,
+                user_agent,
             ),
             script_chan,
             task_manager,
@@ -2116,6 +2151,11 @@ impl Window {
             webrender_api_sender,
             has_sent_idle_message: Cell::new(false),
             layout_is_busy,
+            relayout_event,
+            prepare_for_screenshot,
+            unminify_js,
+            userscripts_path,
+            replace_surrogates,
         });
 
         unsafe { WindowBinding::Wrap(runtime.cx(), win) }
diff --git a/components/script/dom/workerglobalscope.rs b/components/script/dom/workerglobalscope.rs
index 87722f2358e..04aabe6db17 100644
--- a/components/script/dom/workerglobalscope.rs
+++ b/components/script/dom/workerglobalscope.rs
@@ -73,6 +73,8 @@ pub fn prepare_workerscope_init(
         worker_id: global.get_next_worker_id(),
         pipeline_id: global.pipeline_id(),
         origin: global.origin().immutable().clone(),
+        is_headless: global.is_headless(),
+        user_agent: global.get_user_agent(),
     };
 
     init
@@ -132,6 +134,8 @@ impl WorkerGlobalScope {
                 timer_event_chan,
                 MutableOrigin::new(init.origin),
                 runtime.microtask_queue.clone(),
+                init.is_headless,
+                init.user_agent,
             ),
             worker_id: init.worker_id,
             worker_name,
diff --git a/components/script/dom/workernavigator.rs b/components/script/dom/workernavigator.rs
index 6c4867eda9d..92dfa9951e5 100644
--- a/components/script/dom/workernavigator.rs
+++ b/components/script/dom/workernavigator.rs
@@ -79,7 +79,7 @@ impl WorkerNavigatorMethods for WorkerNavigator {
 
     // https://html.spec.whatwg.org/multipage/#dom-navigator-useragent
     fn UserAgent(&self) -> DOMString {
-        navigatorinfo::UserAgent()
+        navigatorinfo::UserAgent(self.global().get_user_agent())
     }
 
     // https://html.spec.whatwg.org/multipage/#dom-navigator-appversion
diff --git a/components/script/dom/workletglobalscope.rs b/components/script/dom/workletglobalscope.rs
index 7532ff1aca8..20f99c76ee2 100644
--- a/components/script/dom/workletglobalscope.rs
+++ b/components/script/dom/workletglobalscope.rs
@@ -30,6 +30,7 @@ use servo_atoms::Atom;
 use servo_url::ImmutableOrigin;
 use servo_url::MutableOrigin;
 use servo_url::ServoUrl;
+use std::borrow::Cow;
 use std::sync::Arc;
 
 #[dom_struct]
@@ -72,6 +73,8 @@ impl WorkletGlobalScope {
                 timer_event_chan,
                 MutableOrigin::new(ImmutableOrigin::new_opaque()),
                 Default::default(),
+                init.is_headless,
+                init.user_agent.clone(),
             ),
             base_url,
             to_script_thread_sender: init.to_script_thread_sender.clone(),
@@ -153,6 +156,10 @@ pub struct WorkletGlobalScopeInit {
     pub scheduler_chan: IpcSender<TimerSchedulerMsg>,
     /// The image cache
     pub image_cache: Arc<dyn ImageCache>,
+    /// True if in headless mode
+    pub is_headless: bool,
+    /// An optional string allowing the user agent to be set for testing
+    pub user_agent: Cow<'static, str>,
 }
 
 /// <https://drafts.css-houdini.org/worklets/#worklet-global-scope-type>
diff --git a/components/script/script_thread.rs b/components/script/script_thread.rs
index a0c8ad3ab43..e2ea62c1fc3 100644
--- a/components/script/script_thread.rs
+++ b/components/script/script_thread.rs
@@ -135,8 +135,8 @@ use script_traits::{ScriptToConstellationChan, TimerEvent, TimerSchedulerMsg};
 use script_traits::{TimerSource, TouchEventType, TouchId, UntrustedNodeAddress, WheelDelta};
 use script_traits::{UpdatePipelineIdReason, WindowSizeData, WindowSizeType};
 use servo_atoms::Atom;
-use servo_config::opts;
 use servo_url::{ImmutableOrigin, MutableOrigin, ServoUrl};
+use std::borrow::Cow;
 use std::cell::Cell;
 use std::cell::RefCell;
 use std::collections::{hash_map, HashMap, HashSet};
@@ -644,6 +644,36 @@ pub struct ScriptThread {
 
     /// FIXME(victor):
     webrender_api_sender: RenderApiSender,
+
+    /// Periodically print out on which events script threads spend their processing time.
+    profile_script_events: bool,
+
+    /// Print Progressive Web Metrics to console.
+    print_pwm: bool,
+
+    /// Emits notifications when there is a relayout.
+    relayout_event: bool,
+
+    /// True if it is safe to write to the image.
+    prepare_for_screenshot: bool,
+
+    /// Unminify Javascript.
+    unminify_js: bool,
+
+    /// Where to load userscripts from, if any. An empty string will load from
+    /// the resources/user-agent-js directory, and if the option isn't passed userscripts
+    /// won't be loaded
+    userscripts_path: Option<String>,
+
+    /// True if headless mode.
+    headless: bool,
+
+    /// Replace unpaired surrogates in DOM strings with U+FFFD.
+    /// See <https://github.com/servo/servo/issues/6564>
+    replace_surrogates: bool,
+
+    /// An optional string allowing the user agent to be set for testing.
+    user_agent: Cow<'static, str>,
 }
 
 /// In the event of thread panic, all data on the stack runs its destructor. However, there
@@ -681,6 +711,15 @@ impl ScriptThreadFactory for ScriptThread {
     fn create(
         state: InitialScriptState,
         load_data: LoadData,
+        profile_script_events: bool,
+        print_pwm: bool,
+        relayout_event: bool,
+        prepare_for_screenshot: bool,
+        unminify_js: bool,
+        userscripts_path: Option<String>,
+        headless: bool,
+        replace_surrogates: bool,
+        user_agent: Cow<'static, str>,
     ) -> (Sender<message::Msg>, Receiver<message::Msg>) {
         let (script_chan, script_port) = unbounded();
 
@@ -703,7 +742,20 @@ impl ScriptThreadFactory for ScriptThread {
                 let window_size = state.window_size;
                 let layout_is_busy = state.layout_is_busy.clone();
 
-                let script_thread = ScriptThread::new(state, script_port, script_chan.clone());
+                let script_thread = ScriptThread::new(
+                    state,
+                    script_port,
+                    script_chan.clone(),
+                    profile_script_events,
+                    print_pwm,
+                    relayout_event,
+                    prepare_for_screenshot,
+                    unminify_js,
+                    userscripts_path,
+                    headless,
+                    replace_surrogates,
+                    user_agent,
+                );
 
                 SCRIPT_THREAD_ROOT.with(|root| {
                     root.set(Some(&script_thread as *const _));
@@ -963,6 +1015,8 @@ impl ScriptThread {
                         to_constellation_sender: script_thread.script_sender.clone(),
                         scheduler_chan: script_thread.scheduler_chan.clone(),
                         image_cache: script_thread.image_cache.clone(),
+                        is_headless: script_thread.headless,
+                        user_agent: script_thread.user_agent.clone(),
                     };
                     Rc::new(WorkletThreadPool::spawn(init))
                 })
@@ -1056,6 +1110,15 @@ impl ScriptThread {
         state: InitialScriptState,
         port: Receiver<MainThreadScriptMsg>,
         chan: Sender<MainThreadScriptMsg>,
+        profile_script_events: bool,
+        print_pwm: bool,
+        relayout_event: bool,
+        prepare_for_screenshot: bool,
+        unminify_js: bool,
+        userscripts_path: Option<String>,
+        headless: bool,
+        replace_surrogates: bool,
+        user_agent: Cow<'static, str>,
     ) -> ScriptThread {
         let runtime = new_rt_and_cx();
         let cx = runtime.cx();
@@ -1159,6 +1222,18 @@ impl ScriptThread {
 
             webrender_document: state.webrender_document,
             webrender_api_sender: state.webrender_api_sender,
+
+            profile_script_events,
+            print_pwm,
+
+            relayout_event,
+            prepare_for_screenshot,
+            unminify_js,
+
+            userscripts_path,
+            headless,
+            replace_surrogates,
+            user_agent,
         }
     }
 
@@ -1537,7 +1612,7 @@ impl ScriptThread {
     {
         self.notify_activity_to_hang_monitor(&category);
         let start = precise_time_ns();
-        let value = if opts::get().profile_script_events {
+        let value = if self.profile_script_events {
             let profiler_cat = match category {
                 ScriptThreadEventCategory::AttachLayout => ProfilerCategory::ScriptAttachLayout,
                 ScriptThreadEventCategory::ConstellationMsg => {
@@ -1586,7 +1661,7 @@ impl ScriptThread {
         for (doc_id, doc) in self.documents.borrow().iter() {
             if let Some(pipeline_id) = pipeline_id {
                 if pipeline_id == doc_id && end - start > MAX_TASK_NS {
-                    if opts::get().print_pwm {
+                    if self.print_pwm {
                         println!(
                             "Task took longer than max allowed ({:?}) {:?}",
                             category,
@@ -2897,6 +2972,13 @@ impl ScriptThread {
             self.webrender_document,
             self.webrender_api_sender.clone(),
             incomplete.layout_is_busy,
+            self.relayout_event,
+            self.prepare_for_screenshot,
+            self.unminify_js,
+            self.userscripts_path.clone(),
+            self.headless,
+            self.replace_surrogates,
+            self.user_agent.clone(),
         );
 
         // Initialize the browsing context for the window.
diff --git a/components/script_traits/lib.rs b/components/script_traits/lib.rs
index 2dbcf6fbde3..c41f215d6ad 100644
--- a/components/script_traits/lib.rs
+++ b/components/script_traits/lib.rs
@@ -49,6 +49,7 @@ use serde::{Deserialize, Deserializer, Serialize, Serializer};
 use servo_atoms::Atom;
 use servo_url::ImmutableOrigin;
 use servo_url::ServoUrl;
+use std::borrow::Cow;
 use std::collections::HashMap;
 use std::fmt;
 use std::sync::atomic::AtomicBool;
@@ -644,6 +645,15 @@ pub trait ScriptThreadFactory {
     fn create(
         state: InitialScriptState,
         load_data: LoadData,
+        profile_script_events: bool,
+        print_pwm: bool,
+        relayout_event: bool,
+        prepare_for_screenshot: bool,
+        unminify_js: bool,
+        userscripts_path: Option<String>,
+        headless: bool,
+        replace_surrogates: bool,
+        user_agent: Cow<'static, str>,
     ) -> (Sender<Self::Message>, Receiver<Self::Message>);
 }
 
@@ -878,6 +888,10 @@ pub struct WorkerGlobalScopeInit {
     pub pipeline_id: PipelineId,
     /// The origin
     pub origin: ImmutableOrigin,
+    /// True if headless mode
+    pub is_headless: bool,
+    /// An optional string allowing the user agnet to be set for testing.
+    pub user_agent: Cow<'static, str>,
 }
 
 /// Common entities representing a network load origin