diff --git a/crates/webidl/src/lib.rs b/crates/webidl/src/lib.rs
index adec017de..b78e52a09 100755
--- a/crates/webidl/src/lib.rs
+++ b/crates/webidl/src/lib.rs
@@ -164,6 +164,10 @@ impl WebidlParse<()> for webidl::ast::NonPartialInterface {
             }),
         });
 
+        for extended_attribute in &self.extended_attributes {
+            extended_attribute.webidl_parse(program, self)?;
+        }
+
         for member in &self.members {
             member.webidl_parse(program, &self.name)?;
         }
@@ -172,6 +176,61 @@ impl WebidlParse<()> for webidl::ast::NonPartialInterface {
     }
 }
 
+impl<'a> WebidlParse<&'a webidl::ast::NonPartialInterface> for webidl::ast::ExtendedAttribute {
+    fn webidl_parse(
+        &self,
+        program: &mut backend::ast::Program,
+        interface: &'a webidl::ast::NonPartialInterface,
+    ) -> Result<()> {
+        let mut add_constructor = |arguments: &[webidl::ast::Argument]| {
+            let self_ty = ident_ty(rust_ident(&interface.name));
+            let kind = backend::ast::ImportFunctionKind::JsConstructor {
+                class: interface.name.to_string(),
+                ty: self_ty.clone(),
+            };
+            create_function(
+                "new",
+                arguments
+                    .iter()
+                    .map(|arg| (&*arg.name, &*arg.type_, arg.variadic)),
+                kind,
+                Some(self_ty),
+                vec![backend::ast::BindgenAttr::Constructor],
+            ).map(|function| {
+                program.imports.push(backend::ast::Import {
+                    module: None,
+                    version: None,
+                    js_namespace: None,
+                    kind: backend::ast::ImportKind::Function(function),
+                })
+            })
+        };
+
+        match self {
+            webidl::ast::ExtendedAttribute::ArgumentList(
+                webidl::ast::ArgumentListExtendedAttribute { arguments, name },
+            ) if name == "Constructor" =>
+            {
+                add_constructor(&*arguments);
+            }
+            webidl::ast::ExtendedAttribute::NoArguments(webidl::ast::Other::Identifier(name))
+                if name == "Constructor" =>
+            {
+                add_constructor(&[] as &[_]);
+            }
+            webidl::ast::ExtendedAttribute::ArgumentList(_)
+            | webidl::ast::ExtendedAttribute::Identifier(_)
+            | webidl::ast::ExtendedAttribute::IdentifierList(_)
+            | webidl::ast::ExtendedAttribute::NamedArgumentList(_)
+            | webidl::ast::ExtendedAttribute::NoArguments(_) => {
+                warn!("Unsupported WebIDL extended attribute: {:?}", self);
+            }
+        }
+
+        Ok(())
+    }
+}
+
 impl<'a> WebidlParse<&'a str> for webidl::ast::InterfaceMember {
     fn webidl_parse(&self, program: &mut backend::ast::Program, self_name: &'a str) -> Result<()> {
         match *self {
diff --git a/crates/webidl/tests/expected/Event.rs b/crates/webidl/tests/expected/Event.rs
index e19cabc54..51807c4db 100644
--- a/crates/webidl/tests/expected/Event.rs
+++ b/crates/webidl/tests/expected/Event.rs
@@ -55,6 +55,55 @@ impl From<Event> for ::wasm_bindgen::JsValue {
 }
 #[no_mangle]
 #[allow(non_snake_case)]
+pub extern "C" fn __wbindgen_describe___widl_f_new_Event() {
+    use wasm_bindgen::describe::*;
+    inform(FUNCTION);
+    inform(2u32);
+    <&str as WasmDescribe>::describe();
+    <EventInit as WasmDescribe>::describe();
+    inform(1);
+    <Event as WasmDescribe>::describe();
+}
+impl Event {
+    #[allow(bad_style)]
+    #[cfg(all(target_arch = "wasm32", not(target_os = "emscripten")))]
+    pub extern "C" fn new(type_: &str, event_init_dict: EventInit) -> Event {
+        ::wasm_bindgen::__rt::link_this_library();
+        #[wasm_import_module = "__wbindgen_placeholder__"]
+        extern "C" {
+            fn __widl_f_new_Event(
+                type_: <&str as ::wasm_bindgen::convert::IntoWasmAbi>::Abi,
+                event_init_dict: <EventInit as ::wasm_bindgen::convert::IntoWasmAbi>::Abi,
+            ) -> <Event as ::wasm_bindgen::convert::FromWasmAbi>::Abi;
+        }
+        unsafe {
+            let _ret = {
+                let mut __stack = ::wasm_bindgen::convert::GlobalStack::new();
+                let type_ =
+                    <&str as ::wasm_bindgen::convert::IntoWasmAbi>::into_abi(type_, &mut __stack);
+                let event_init_dict = <EventInit as ::wasm_bindgen::convert::IntoWasmAbi>::into_abi(
+                    event_init_dict,
+                    &mut __stack,
+                );
+                __widl_f_new_Event(type_, event_init_dict)
+            };
+            <Event as ::wasm_bindgen::convert::FromWasmAbi>::from_abi(
+                _ret,
+                &mut ::wasm_bindgen::convert::GlobalStack::new(),
+            )
+        }
+    }
+    #[allow(bad_style, unused_variables)]
+    #[cfg(not(all(target_arch = "wasm32", not(target_os = "emscripten"))))]
+    pub extern "C" fn new(type_: &str, event_init_dict: EventInit) -> Event {
+        panic!(
+            "cannot call wasm-bindgen imported functions on \
+             non-wasm targets"
+        );
+    }
+}
+#[no_mangle]
+#[allow(non_snake_case)]
 pub extern "C" fn __wbindgen_describe___widl_f_event_phase_Event() {
     use wasm_bindgen::describe::*;
     inform(FUNCTION);
@@ -700,6 +749,8 @@ impl Event {
 }
 #[allow(non_camel_case_types)]
 pub type DOMHighResTimeStamp = f64;
+#[allow(non_camel_case_types)]
+pub type EventInit = bool;
 #[allow(non_upper_case_globals)]
 #[wasm_custom_section = "__wasm_bindgen_unstable"]
-const __WASM_BINDGEN_GENERATED_wasm_bindgen_webidl_0_2_11_0 : [ u8 ; 4213usize ] = * b"q\x10\0\0{\"exports\":[],\"enums\":[],\"imports\":[{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"type\"}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_event_phase_Event\",\"catch\":false,\"method\":true,\"js_new\":false,\"structural\":false,\"getter\":\"eventPhase\",\"setter\":null,\"class\":\"Event\",\"function\":{\"name\":\"eventPhase\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_stop_propagation_Event\",\"catch\":false,\"method\":true,\"js_new\":false,\"structural\":false,\"getter\":null,\"setter\":null,\"class\":\"Event\",\"function\":{\"name\":\"stopPropagation\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_stop_immediate_propagation_Event\",\"catch\":false,\"method\":true,\"js_new\":false,\"structural\":false,\"getter\":null,\"setter\":null,\"class\":\"Event\",\"function\":{\"name\":\"stopImmediatePropagation\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_bubbles_Event\",\"catch\":false,\"method\":true,\"js_new\":false,\"structural\":false,\"getter\":\"bubbles\",\"setter\":null,\"class\":\"Event\",\"function\":{\"name\":\"bubbles\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_cancelable_Event\",\"catch\":false,\"method\":true,\"js_new\":false,\"structural\":false,\"getter\":\"cancelable\",\"setter\":null,\"class\":\"Event\",\"function\":{\"name\":\"cancelable\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_prevent_default_Event\",\"catch\":false,\"method\":true,\"js_new\":false,\"structural\":false,\"getter\":null,\"setter\":null,\"class\":\"Event\",\"function\":{\"name\":\"preventDefault\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_default_prevented_Event\",\"catch\":false,\"method\":true,\"js_new\":false,\"structural\":false,\"getter\":\"defaultPrevented\",\"setter\":null,\"class\":\"Event\",\"function\":{\"name\":\"defaultPrevented\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_default_prevented_by_chrome_Event\",\"catch\":false,\"method\":true,\"js_new\":false,\"structural\":false,\"getter\":\"defaultPreventedByChrome\",\"setter\":null,\"class\":\"Event\",\"function\":{\"name\":\"defaultPreventedByChrome\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_default_prevented_by_content_Event\",\"catch\":false,\"method\":true,\"js_new\":false,\"structural\":false,\"getter\":\"defaultPreventedByContent\",\"setter\":null,\"class\":\"Event\",\"function\":{\"name\":\"defaultPreventedByContent\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_composed_Event\",\"catch\":false,\"method\":true,\"js_new\":false,\"structural\":false,\"getter\":\"composed\",\"setter\":null,\"class\":\"Event\",\"function\":{\"name\":\"composed\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_is_trusted_Event\",\"catch\":false,\"method\":true,\"js_new\":false,\"structural\":false,\"getter\":\"isTrusted\",\"setter\":null,\"class\":\"Event\",\"function\":{\"name\":\"isTrusted\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_time_stamp_Event\",\"catch\":false,\"method\":true,\"js_new\":false,\"structural\":false,\"getter\":\"timeStamp\",\"setter\":null,\"class\":\"Event\",\"function\":{\"name\":\"timeStamp\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_init_event_Event\",\"catch\":false,\"method\":true,\"js_new\":false,\"structural\":false,\"getter\":null,\"setter\":null,\"class\":\"Event\",\"function\":{\"name\":\"initEvent\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_cancel_bubble_Event\",\"catch\":false,\"method\":true,\"js_new\":false,\"structural\":false,\"getter\":\"cancelBubble\",\"setter\":null,\"class\":\"Event\",\"function\":{\"name\":\"cancelBubble\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_set_cancel_bubble_Event\",\"catch\":false,\"method\":true,\"js_new\":false,\"structural\":false,\"getter\":null,\"setter\":\"cancelBubble\",\"class\":\"Event\",\"function\":{\"name\":\"set_CancelBubble\"}}}],\"structs\":[],\"version\":\"0.2.11 (0cd767c9d)\",\"schema_version\":\"4\"}" ;
+const __WASM_BINDGEN_GENERATED_wasm_bindgen_webidl_0_2_11_0 : [ u8 ; 4451usize ] = * b"_\x11\0\0{\"exports\":[],\"enums\":[],\"imports\":[{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"type\"}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_new_Event\",\"catch\":false,\"method\":false,\"js_new\":true,\"structural\":false,\"getter\":null,\"setter\":null,\"class\":\"Event\",\"function\":{\"name\":\"new\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_event_phase_Event\",\"catch\":false,\"method\":true,\"js_new\":false,\"structural\":false,\"getter\":\"eventPhase\",\"setter\":null,\"class\":\"Event\",\"function\":{\"name\":\"eventPhase\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_stop_propagation_Event\",\"catch\":false,\"method\":true,\"js_new\":false,\"structural\":false,\"getter\":null,\"setter\":null,\"class\":\"Event\",\"function\":{\"name\":\"stopPropagation\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_stop_immediate_propagation_Event\",\"catch\":false,\"method\":true,\"js_new\":false,\"structural\":false,\"getter\":null,\"setter\":null,\"class\":\"Event\",\"function\":{\"name\":\"stopImmediatePropagation\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_bubbles_Event\",\"catch\":false,\"method\":true,\"js_new\":false,\"structural\":false,\"getter\":\"bubbles\",\"setter\":null,\"class\":\"Event\",\"function\":{\"name\":\"bubbles\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_cancelable_Event\",\"catch\":false,\"method\":true,\"js_new\":false,\"structural\":false,\"getter\":\"cancelable\",\"setter\":null,\"class\":\"Event\",\"function\":{\"name\":\"cancelable\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_prevent_default_Event\",\"catch\":false,\"method\":true,\"js_new\":false,\"structural\":false,\"getter\":null,\"setter\":null,\"class\":\"Event\",\"function\":{\"name\":\"preventDefault\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_default_prevented_Event\",\"catch\":false,\"method\":true,\"js_new\":false,\"structural\":false,\"getter\":\"defaultPrevented\",\"setter\":null,\"class\":\"Event\",\"function\":{\"name\":\"defaultPrevented\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_default_prevented_by_chrome_Event\",\"catch\":false,\"method\":true,\"js_new\":false,\"structural\":false,\"getter\":\"defaultPreventedByChrome\",\"setter\":null,\"class\":\"Event\",\"function\":{\"name\":\"defaultPreventedByChrome\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_default_prevented_by_content_Event\",\"catch\":false,\"method\":true,\"js_new\":false,\"structural\":false,\"getter\":\"defaultPreventedByContent\",\"setter\":null,\"class\":\"Event\",\"function\":{\"name\":\"defaultPreventedByContent\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_composed_Event\",\"catch\":false,\"method\":true,\"js_new\":false,\"structural\":false,\"getter\":\"composed\",\"setter\":null,\"class\":\"Event\",\"function\":{\"name\":\"composed\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_is_trusted_Event\",\"catch\":false,\"method\":true,\"js_new\":false,\"structural\":false,\"getter\":\"isTrusted\",\"setter\":null,\"class\":\"Event\",\"function\":{\"name\":\"isTrusted\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_time_stamp_Event\",\"catch\":false,\"method\":true,\"js_new\":false,\"structural\":false,\"getter\":\"timeStamp\",\"setter\":null,\"class\":\"Event\",\"function\":{\"name\":\"timeStamp\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_init_event_Event\",\"catch\":false,\"method\":true,\"js_new\":false,\"structural\":false,\"getter\":null,\"setter\":null,\"class\":\"Event\",\"function\":{\"name\":\"initEvent\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_cancel_bubble_Event\",\"catch\":false,\"method\":true,\"js_new\":false,\"structural\":false,\"getter\":\"cancelBubble\",\"setter\":null,\"class\":\"Event\",\"function\":{\"name\":\"cancelBubble\"}}},{\"module\":null,\"version\":null,\"js_namespace\":null,\"kind\":{\"kind\":\"function\",\"shim\":\"__widl_f_set_cancel_bubble_Event\",\"catch\":false,\"method\":true,\"js_new\":false,\"structural\":false,\"getter\":null,\"setter\":\"cancelBubble\",\"class\":\"Event\",\"function\":{\"name\":\"set_CancelBubble\"}}}],\"structs\":[],\"version\":\"0.2.11 (0cd767c9d)\",\"schema_version\":\"4\"}" ;
diff --git a/crates/webidl/tests/fixtures/Event.webidl b/crates/webidl/tests/fixtures/Event.webidl
index 8dea443a8..78ab021bd 100644
--- a/crates/webidl/tests/fixtures/Event.webidl
+++ b/crates/webidl/tests/fixtures/Event.webidl
@@ -13,6 +13,9 @@
 // TODO: don't include this here, use Performance.webidl instead
 typedef double DOMHighResTimeStamp;
 
+// TODO: remove this when dicts are resolved
+typedef boolean EventInit;
+
 [Constructor(DOMString type, optional EventInit eventInitDict),
  Exposed=(Window,Worker,System), ProbablyShortLivingWrapper]
 interface Event {
@@ -60,3 +63,9 @@ interface Event {
                  optional boolean cancelable = false);
   attribute boolean cancelBubble;
 };
+
+dictionary EventInit {
+  boolean bubbles = false;
+  boolean cancelable = false;
+  boolean composed = false;
+};
diff --git a/tests/all/webidl/simple.rs b/tests/all/webidl/simple.rs
index d13a228e5..7b67d6cc0 100644
--- a/tests/all/webidl/simple.rs
+++ b/tests/all/webidl/simple.rs
@@ -1,15 +1,15 @@
 use super::project;
 
 #[test]
-fn webidl() {
+fn method() {
     project()
         .file(
             "foo.webidl",
             r#"
-            [Constructor(float value)]
+            [Constructor(double value)]
             interface Foo {
                 [Pure]
-                boolean my_cmp(Foo bar);
+                boolean myCmp(Foo bar);
             };
         "#,
         )
@@ -17,11 +17,10 @@ fn webidl() {
             "foo.ts",
             r#"
             export class Foo {
-                value: number;
-                constructor(value: number) {
+                constructor(private value: number) {
                     this.value = value;
                 }
-                my_cmp(other: Foo): boolean {
+                myCmp(other: Foo): boolean {
                     return this.value === other.value;
                 }
             }
@@ -38,26 +37,82 @@ fn webidl() {
 
             pub mod foo;
 
-            #[wasm_bindgen]
-            pub fn call_my_cmp(first: &foo::Foo, second: foo::Foo) -> bool {
-                first.my_cmp(second)
-            }
-        "#,
-        )
-        .file(
-            "test.ts",
-            r#"
-            import * as assert from 'assert';
-            import * as wasm from './out';
-            import {Foo} from './foo';
+            use foo::Foo;
 
-            export function test() {
-                const pi = new Foo(3.14159);
-                const e = new Foo(2.71828);
-                assert.strictEqual(wasm.call_my_cmp(pi, pi), true);
-                assert.strictEqual(wasm.call_my_cmp(pi, e), false);
-                assert.strictEqual(wasm.call_my_cmp(e, pi), false);
-                assert.strictEqual(wasm.call_my_cmp(e, e), true);
+            #[wasm_bindgen]
+            pub fn test() {
+                let pi = Foo::new(3.14159);
+                let e = Foo::new(2.71828);
+                let tmp = pi.my_cmp(Foo::new(3.14159));
+                assert!(tmp);
+                let tmp =!pi.my_cmp(Foo::new(2.71828));
+                assert!(tmp);
+                let tmp = !e.my_cmp(Foo::new(3.14159));
+                assert!(tmp);
+                let tmp = e.my_cmp(Foo::new(2.71828));
+                assert!(tmp);
+            }
+        "#,
+        )
+        .test();
+}
+
+#[test]
+fn property() {
+    project()
+        .file(
+            "foo.webidl",
+            r#"
+            [Constructor(double value)]
+            interface Foo {
+                [Pure]
+                attribute double value;
+            };
+        "#,
+        )
+        .file(
+            "foo.ts",
+            r#"
+            export class Foo {
+                constructor(private _value: number) {
+                    this._value = _value;
+                }
+
+                get value(): number {
+                    return this._value;
+                }
+
+                set value(_value: number) {
+                    this._value = _value;
+                }
+            }
+            "#,
+        )
+        .file(
+            "src/lib.rs",
+            r#"
+            #![feature(proc_macro, wasm_custom_section, wasm_import_module)]
+
+            extern crate wasm_bindgen;
+
+            use wasm_bindgen::prelude::*;
+
+            pub mod foo;
+
+            use foo::Foo;
+
+            #[wasm_bindgen]
+            pub fn test() {
+                let x = Foo::new(3.14159);
+                let tmp = x.value() == 3.14159;
+                assert!(tmp);
+                let tmp = x.value() != 2.71828;
+                assert!(tmp);
+                x.set_value(2.71828);
+                let tmp = x.value() != 3.14159;
+                assert!(tmp);
+                let tmp = x.value() == 2.71828;
+                assert!(tmp);
             }
         "#,
         )