--- a/servo/components/style/build_gecko.rs
+++ b/servo/components/style/build_gecko.rs
@@ -607,19 +607,21 @@ mod bindings {
             "RawGeckoKeyframeList",
             "RawGeckoComputedKeyframeValuesList",
             "RawGeckoFontFaceRuleList",
             "RawGeckoNode",
             "RawGeckoAnimationValueList",
             "RawServoAnimationValue",
             "RawServoAnimationValueMap",
             "RawServoDeclarationBlock",
+            "RawServoStyleRule",
             "RawGeckoPresContext",
             "RawGeckoPresContextOwned",
             "RawGeckoStyleAnimationList",
+            "RawGeckoServoStyleRuleList",
             "RawGeckoURLExtraData",
             "RefPtr",
             "CSSPseudoClassType",
             "TraversalRestyleBehavior",
             "TraversalRootBehavior",
             "ComputedTimingFunction_BeforeFlag",
             "FontFamilyList",
             "FontFamilyType",
@@ -723,16 +725,17 @@ mod bindings {
             "nsCSSValue",
             "nsTimingFunction",
             "RawGeckoAnimationPropertySegment",
             "RawGeckoAnimationValueList",
             "RawGeckoComputedTiming",
             "RawGeckoKeyframeList",
             "RawGeckoComputedKeyframeValuesList",
             "RawGeckoFontFaceRuleList",
+            "RawGeckoServoStyleRuleList",
         ];
         for &ty in structs_types.iter() {
             builder = builder.hide_type(ty)
                 .raw_line(format!("use gecko_bindings::structs::{};", ty));
             // TODO this is hacky, figure out a better way to do it without
             // hardcoding everything...
             if ty.starts_with("nsStyle") {
                 builder = builder

--- a/servo/components/style/gecko/arc_types.rs
+++ b/servo/components/style/gecko/arc_types.rs
@@ -4,19 +4,20 @@
 
 //! This file lists all arc FFI types and defines corresponding addref
 //! and release functions. This list corresponds to ServoArcTypeList.h
 //! file in Gecko.
 
 #![allow(non_snake_case, missing_docs)]
 
 use gecko_bindings::bindings::{RawServoMediaList, RawServoMediaRule, RawServoNamespaceRule};
-use gecko_bindings::bindings::{RawServoStyleSheet, RawServoStyleRule, RawServoImportRule};
+use gecko_bindings::bindings::{RawServoStyleSheet, RawServoImportRule};
 use gecko_bindings::bindings::{ServoComputedValues, ServoCssRules};
-use gecko_bindings::structs::{RawServoAnimationValue, RawServoAnimationValueMap, RawServoDeclarationBlock};
+use gecko_bindings::structs::{RawServoAnimationValue, RawServoAnimationValueMap};
+use gecko_bindings::structs::{RawServoDeclarationBlock, RawServoStyleRule};
 use gecko_bindings::sugar::ownership::{HasArcFFI, HasFFI};
 use media_queries::MediaList;
 use parking_lot::RwLock;
 use properties::{ComputedValues, PropertyDeclarationBlock};
 use properties::animated_properties::{AnimationValue, AnimationValueMap};
 use shared_lock::Locked;
 use stylesheets::{CssRules, Stylesheet, StyleRule, ImportRule, MediaRule, NamespaceRule};
 

--- a/servo/ports/geckolib/glue.rs
+++ b/servo/ports/geckolib/glue.rs
@@ -27,42 +27,43 @@ use style::gecko::selector_parser::{Sele
 use style::gecko::traversal::RecalcStyleOnly;
 use style::gecko::wrapper::GeckoElement;
 use style::gecko_bindings::bindings;
 use style::gecko_bindings::bindings::{RawGeckoKeyframeListBorrowed, RawGeckoKeyframeListBorrowedMut};
 use style::gecko_bindings::bindings::{RawServoDeclarationBlockBorrowed, RawServoDeclarationBlockStrong};
 use style::gecko_bindings::bindings::{RawServoMediaListBorrowed, RawServoMediaListStrong};
 use style::gecko_bindings::bindings::{RawServoMediaRule, RawServoMediaRuleBorrowed};
 use style::gecko_bindings::bindings::{RawServoNamespaceRule, RawServoNamespaceRuleBorrowed};
-use style::gecko_bindings::bindings::{RawServoStyleRule, RawServoStyleRuleBorrowed};
 use style::gecko_bindings::bindings::{RawServoStyleSetBorrowed, RawServoStyleSetOwned};
 use style::gecko_bindings::bindings::{RawServoStyleSheetBorrowed, ServoComputedValuesBorrowed};
 use style::gecko_bindings::bindings::{RawServoStyleSheetStrong, ServoComputedValuesStrong};
 use style::gecko_bindings::bindings::{ServoCssRulesBorrowed, ServoCssRulesStrong};
 use style::gecko_bindings::bindings::{nsACString, nsAString};
 use style::gecko_bindings::bindings::Gecko_AnimationAppendKeyframe;
 use style::gecko_bindings::bindings::RawGeckoAnimationPropertySegmentBorrowed;
 use style::gecko_bindings::bindings::RawGeckoComputedKeyframeValuesListBorrowedMut;
 use style::gecko_bindings::bindings::RawGeckoComputedTimingBorrowed;
 use style::gecko_bindings::bindings::RawGeckoElementBorrowed;
 use style::gecko_bindings::bindings::RawGeckoFontFaceRuleListBorrowedMut;
+use style::gecko_bindings::bindings::RawGeckoServoStyleRuleListBorrowedMut;
 use style::gecko_bindings::bindings::RawServoAnimationValueBorrowed;
 use style::gecko_bindings::bindings::RawServoAnimationValueMapBorrowed;
 use style::gecko_bindings::bindings::RawServoAnimationValueStrong;
 use style::gecko_bindings::bindings::RawServoImportRuleBorrowed;
+use style::gecko_bindings::bindings::RawServoStyleRuleBorrowed;
 use style::gecko_bindings::bindings::ServoComputedValuesBorrowedOrNull;
 use style::gecko_bindings::bindings::nsTArrayBorrowed_uintptr_t;
 use style::gecko_bindings::bindings::nsTimingFunctionBorrowed;
 use style::gecko_bindings::bindings::nsTimingFunctionBorrowedMut;
 use style::gecko_bindings::structs;
 use style::gecko_bindings::structs::{SheetParsingMode, nsIAtom, nsCSSPropertyID};
 use style::gecko_bindings::structs::{nsRestyleHint, nsChangeHint, nsCSSFontFaceRule};
 use style::gecko_bindings::structs::Loader;
 use style::gecko_bindings::structs::RawGeckoPresContextOwned;
-use style::gecko_bindings::structs::ServoStyleSheet;
+use style::gecko_bindings::structs::{RawServoStyleRule, ServoStyleSheet};
 use style::gecko_bindings::structs::URLExtraData;
 use style::gecko_bindings::structs::nsCSSValueSharedList;
 use style::gecko_bindings::structs::nsresult;
 use style::gecko_bindings::sugar::ownership::{FFIArcHelpers, HasFFI, HasArcFFI, HasBoxFFI};
 use style::gecko_bindings::sugar::ownership::{HasSimpleFFI, Strong};
 use style::gecko_bindings::sugar::refptr::RefPtr;
 use style::gecko_properties::{self, style_structs};
 use style::keyframes::KeyframesStepValue;
@@ -70,16 +71,17 @@ use style::media_queries::{MediaList, pa
 use style::parallel;
 use style::parser::ParserContext;
 use style::properties::{CascadeFlags, ComputedValues, Importance, ParsedDeclaration};
 use style::properties::{PropertyDeclarationBlock, PropertyId};
 use style::properties::SKIP_ROOT_AND_ITEM_BASED_DISPLAY_FIXUP;
 use style::properties::animated_properties::{AnimationValue, Interpolate, TransitionProperty};
 use style::properties::parse_one_declaration;
 use style::restyle_hints::{self, RestyleHint};
+use style::rule_tree::StyleSource;
 use style::selector_parser::PseudoElementCascadeType;
 use style::sequential;
 use style::shared_lock::{SharedRwLock, SharedRwLockReadGuard, StylesheetGuards, ToCssWithGuard, Locked};
 use style::string_cache::Atom;
 use style::stylesheets::{CssRule, CssRules, ImportRule, MediaRule, NamespaceRule};
 use style::stylesheets::{Origin, Stylesheet, StyleRule};
 use style::stylesheets::StylesheetLoader as StyleStylesheetLoader;
 use style::supports::parse_condition_or_declaration;
@@ -1528,16 +1530,40 @@ pub extern "C" fn Servo_Element_GetSnaps
         },
     };
 
     debug!("Servo_Element_GetSnapshot: {:?}: {:?}", element, snapshot);
     snapshot
 }
 
 #[no_mangle]
+pub extern "C" fn Servo_Element_GetStyleRuleList(element: RawGeckoElementBorrowed,
+                                                 rules: RawGeckoServoStyleRuleListBorrowedMut) {
+    let element = GeckoElement(element);
+    let data = match element.borrow_data() {
+        Some(element_data) => element_data,
+        None => return,
+    };
+    let computed = match data.get_styles() {
+        Some(styles) => &styles.primary,
+        None => return,
+    };
+    let mut result = vec![];
+    for rule_node in computed.rules.self_and_ancestors() {
+        if let Some(&StyleSource::Style(ref rule)) = rule_node.style_source() {
+            result.push(Locked::<StyleRule>::arc_as_borrowed(&rule));
+        }
+    }
+    unsafe { rules.set_len(result.len() as u32) };
+    for (&src, dest) in result.into_iter().zip(rules.iter_mut()) {
+        *dest = src;
+    }
+}
+
+#[no_mangle]
 pub extern "C" fn Servo_NoteExplicitHints(element: RawGeckoElementBorrowed,
                                           restyle_hint: nsRestyleHint,
                                           change_hint: nsChangeHint) {
     let element = GeckoElement(element);
     let damage = GeckoRestyleDamage::new(change_hint);
     debug!("Servo_NoteExplicitHints: {:?}, restyle_hint={:?}, change_hint={:?}",
            element, restyle_hint, change_hint);
     debug_assert!(restyle_hint == structs::nsRestyleHint_eRestyle_CSSAnimations ||