diff --git a/CHANGELOG.md b/CHANGELOG.md
index e05d34f..12573d6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,7 @@
 ## 0.3.4
+* Element#children=
+* Support more methods on Media
+* Event::Custom to support non-enumerable properties
 * DOM::Element::Form: #valid?, #request_submit, #ajax_submit
 * Compatibility for Opal-RSpec 1.0
 
diff --git a/opal/browser/dom/element.rb b/opal/browser/dom/element.rb
index a219167..7eb0173 100644
--- a/opal/browser/dom/element.rb
+++ b/opal/browser/dom/element.rb
@@ -1,3 +1,5 @@
+# backtick_javascript: true
+
 # Requires are moved to the bottom of this file.
 
 module Browser; module DOM
@@ -367,6 +369,8 @@ def inner_dom=(node)
     self << node
   end
 
+  alias children= inner_dom=
+
   # @!attribute inner_html
   # @return [String] the inner HTML of the element
   def inner_html
diff --git a/opal/browser/dom/element/attributes.rb b/opal/browser/dom/element/attributes.rb
index 34756c7..18c64a2 100644
--- a/opal/browser/dom/element/attributes.rb
+++ b/opal/browser/dom/element/attributes.rb
@@ -1,3 +1,5 @@
+# backtick_javascript: true
+
 module Browser; module DOM; class Element < Node
 
 class Attributes
diff --git a/opal/browser/dom/element/button.rb b/opal/browser/dom/element/button.rb
index c04b036..37fa859 100644
--- a/opal/browser/dom/element/button.rb
+++ b/opal/browser/dom/element/button.rb
@@ -1,3 +1,5 @@
+# backtick_javascript: true
+
 module Browser; module DOM; class Element < Node
 
 class Button < Element
diff --git a/opal/browser/dom/element/custom.rb b/opal/browser/dom/element/custom.rb
index 747b621..94f9305 100644
--- a/opal/browser/dom/element/custom.rb
+++ b/opal/browser/dom/element/custom.rb
@@ -1,5 +1,6 @@
 # use_strict: true
 # helpers: truthy
+# backtick_javascript: true
 
 module Browser; module DOM; class Element < Node
 
@@ -174,4 +175,4 @@ def detached_once
   include Mixin
 end
 
-end; end; end
\ No newline at end of file
+end; end; end
diff --git a/opal/browser/dom/element/data.rb b/opal/browser/dom/element/data.rb
index fea87b0..e142ab3 100644
--- a/opal/browser/dom/element/data.rb
+++ b/opal/browser/dom/element/data.rb
@@ -1,3 +1,5 @@
+# backtick_javascript: true
+
 module Browser; module DOM; class Element < Node
 
 class Data
diff --git a/opal/browser/dom/element/editable.rb b/opal/browser/dom/element/editable.rb
index 0f536bc..99f5308 100644
--- a/opal/browser/dom/element/editable.rb
+++ b/opal/browser/dom/element/editable.rb
@@ -1,3 +1,5 @@
+# backtick_javascript: true
+
 module Browser; module DOM
 
 class Element < Node
diff --git a/opal/browser/dom/element/form.rb b/opal/browser/dom/element/form.rb
index 27e7cd5..c1986d0 100644
--- a/opal/browser/dom/element/form.rb
+++ b/opal/browser/dom/element/form.rb
@@ -1,3 +1,5 @@
+# backtick_javascript: true
+
 module Browser; module DOM; class Element < Node
 
 class Form < Element
diff --git a/opal/browser/dom/element/iframe.rb b/opal/browser/dom/element/iframe.rb
index 949e4ff..91789f4 100644
--- a/opal/browser/dom/element/iframe.rb
+++ b/opal/browser/dom/element/iframe.rb
@@ -1,3 +1,5 @@
+# backtick_javascript: true
+
 module Browser; module DOM; class Element < Node
 
 class Iframe < Element
diff --git a/opal/browser/dom/element/image.rb b/opal/browser/dom/element/image.rb
index 6dd23fe..d47d745 100644
--- a/opal/browser/dom/element/image.rb
+++ b/opal/browser/dom/element/image.rb
@@ -1,23 +1,14 @@
+# backtick_javascript: true
+
 module Browser; module DOM; class Element < Node
 
 class Image < Element
   def_selector "img"
 
-  def complete?
-    `#@native.complete`
-  end
-
-  def cross?
-    `#@native.crossOrigin`
-  end
-
-  def height
-    `#@native.naturalHeight`
-  end
-
-  def width
-    `#@native.naturalWidth`
-  end
+  alias_native :complete?, :complete
+  alias_native :cross?, :crossOrigin
+  alias_native :height, :naturalHeight
+  alias_native :width, :naturalWidth
 end
 
 Img = Image
diff --git a/opal/browser/dom/element/input.rb b/opal/browser/dom/element/input.rb
index d11c811..106f677 100644
--- a/opal/browser/dom/element/input.rb
+++ b/opal/browser/dom/element/input.rb
@@ -1,3 +1,5 @@
+# backtick_javascript: true
+
 module Browser; module DOM; class Element < Node
 
 class Input < Element
@@ -14,21 +16,11 @@ def value
     }
   end
 
-  def value=(value)
-    `#@native.value = #{value}`
-  end
-
-  def name_
-    `#@native.name`
-  end
-
-  def type
-    `#@native.type`
-  end
-
-  def checked?
-    `#@native.checked`
-  end
+  alias_native :value=
+  alias_native :name_, :name
+  alias_native :type
+  alias_native :checked?, :checked
+  alias_native :enabled?, :enabled
 
   def check!
     `#@native.checked = 'checked'`
@@ -38,10 +30,6 @@ def uncheck!
     `#@native.checked = ''`
   end
 
-  def enabled?
-    `#@native.enabled`
-  end
-
   def disable!
     `#@native.disabled = 'disabled'`
   end
diff --git a/opal/browser/dom/element/media.rb b/opal/browser/dom/element/media.rb
index 4d2078a..a1aa4ba 100644
--- a/opal/browser/dom/element/media.rb
+++ b/opal/browser/dom/element/media.rb
@@ -1,9 +1,10 @@
 module Browser; module DOM; class Element < Node
 
 class Media < Element
-  def play
-    `#@native.play()`
-  end
+  alias_native :play
+  alias_native :pause
+  alias_native :time, :currentTime
+  alias_native :time=, :currentTime
 end
 
 class Video < Media
diff --git a/opal/browser/dom/element/offset.rb b/opal/browser/dom/element/offset.rb
index 0089817..3d7688d 100644
--- a/opal/browser/dom/element/offset.rb
+++ b/opal/browser/dom/element/offset.rb
@@ -1,3 +1,5 @@
+# backtick_javascript: true
+
 module Browser; module DOM; class Element < Node
 
 class Offset
diff --git a/opal/browser/dom/element/scroll.rb b/opal/browser/dom/element/scroll.rb
index b7e8c15..de02820 100644
--- a/opal/browser/dom/element/scroll.rb
+++ b/opal/browser/dom/element/scroll.rb
@@ -1,3 +1,5 @@
+# backtick_javascript: true
+
 module Browser; module DOM; class Element < Node
 
 # @todo Consider using the new interfaces which allow for optional
diff --git a/opal/browser/dom/element/select.rb b/opal/browser/dom/element/select.rb
index c90657b..dc23960 100644
--- a/opal/browser/dom/element/select.rb
+++ b/opal/browser/dom/element/select.rb
@@ -1,3 +1,5 @@
+# backtick_javascript: true
+
 module Browser; module DOM; class Element < Node
 
 class Select < Element
@@ -14,9 +16,7 @@ def value
     }
   end
 
-  def value= value
-    `#@native.value = #{value.to_n}`
-  end
+  alias_native :value=
 
   def labels
     NodeSet[Native::Array.new(`#@native.labels`)]
@@ -30,10 +30,7 @@ def option
     DOM(`#@native.options[#@native.selectedIndex]`)
   end
 
-  def index
-    `#@native.selectedIndex`
-  end
-
+  alias_native :index, :selectedIndex
   alias_native :multiple?, :multiple
   alias_native :required?, :required
   alias_native :length
diff --git a/opal/browser/dom/element/size.rb b/opal/browser/dom/element/size.rb
index fb96225..6ca8fc9 100644
--- a/opal/browser/dom/element/size.rb
+++ b/opal/browser/dom/element/size.rb
@@ -1,6 +1,8 @@
 module Browser; module DOM; class Element < Node
 
 class Size
+  include Native::Wrapper
+
   attr_reader :element
 
   # @private
@@ -12,9 +14,7 @@ def initialize(element, *inc)
 
   # @!attribute width
   # @return [Integer] the element width
-  def width
-    `#@native.offsetWidth`
-  end
+  alias_native :width, :offsetWidth
 
   def width=(value)
     @element.style[:width] = value
@@ -22,9 +22,7 @@ def width=(value)
 
   # @!attribute height
   # @return [Integer] the element height
-  def height
-    `#@native.offsetHeight`
-  end
+  alias_native :height, :offsetHeight
 
   def height=(value)
     @element.style[:height] = value
@@ -32,15 +30,11 @@ def height=(value)
 
   # @!attribute client_width
   # @return [Integer] the content-box width of an element
-  def client_width
-    `#@native.clientWidth`
-  end
+  alias_native :client_width, :clientWidth
 
   # @!attribute client_height
   # @return [Integer] the content-box height of an element
-  def client_height
-    `#@native.clientHeight`
-  end
+  alias_native :client_height, :clientHeight
 end
 
 end; end; end
diff --git a/opal/browser/dom/element/template.rb b/opal/browser/dom/element/template.rb
index 2448663..e6ecf89 100644
--- a/opal/browser/dom/element/template.rb
+++ b/opal/browser/dom/element/template.rb
@@ -1,3 +1,5 @@
+# backtick_javascript: true
+
 module Browser; module DOM; class Element < Node
 
 class Template < Element
diff --git a/opal/browser/dom/element/textarea.rb b/opal/browser/dom/element/textarea.rb
index 5700718..338e8f6 100644
--- a/opal/browser/dom/element/textarea.rb
+++ b/opal/browser/dom/element/textarea.rb
@@ -1,3 +1,5 @@
+# backtick_javascript: true
+
 module Browser; module DOM; class Element < Node
 
 class Textarea < Element
@@ -14,9 +16,7 @@ def value
     }
   end
 
-  def value=(value)
-    `#@native.value = #{value}`
-  end
+  alias_native :value=
 
   def clear
     `#@native.value = ''`
diff --git a/opal/browser/event/animation.rb b/opal/browser/event/animation.rb
index e6b3c3d..c4a158b 100644
--- a/opal/browser/event/animation.rb
+++ b/opal/browser/event/animation.rb
@@ -1,3 +1,5 @@
+# backtick_javascript: true
+
 module Browser; class Event
 
 class Animation < Event
@@ -8,13 +10,9 @@ def self.supported?
   end
 
   class Definition < Definition
-    def animation=(value)
-      `#@native.animationName = #{value}`
-    end
-
-    def elapsed=(value)
-      `#@native.elapsedTime = #{value}`
-    end
+    alias_native :name=, :animationName=
+    alias_native :animation=, :animationName=
+    alias_native :elapsed=, :elapsedTime=
   end
 
   if Browser.supports? 'Event.constructor'
diff --git a/opal/browser/event/audio_processing.rb b/opal/browser/event/audio_processing.rb
index a712040..71aa7bd 100644
--- a/opal/browser/event/audio_processing.rb
+++ b/opal/browser/event/audio_processing.rb
@@ -1,3 +1,5 @@
+# backtick_javascript: true
+
 module Browser; class Event
 
 class AudioProcessing < Event
@@ -8,17 +10,9 @@ def self.supported?
   end
 
   class Definition < Definition
-    def time=(value)
-      `#@native.playbackTime = #{value}`
-    end
-
-    def input=(value)
-      `#@native.inputBuffer = #{value}`
-    end
-
-    def output=(value)
-      `#@native.outputBuffer = #{value}`
-    end
+    alias_native :time=, :playbackTime=
+    alias_native :input=, :inputBuffer=
+    alias_native :output=, :outputBuffer=
   end
 
   if Browser.supports? 'Event.constructor'
diff --git a/opal/browser/event/base.rb b/opal/browser/event/base.rb
index c812845..e8f3036 100644
--- a/opal/browser/event/base.rb
+++ b/opal/browser/event/base.rb
@@ -1,3 +1,5 @@
+# backtick_javascript: true
+
 module Browser
 
 class Event
@@ -16,14 +18,10 @@ def self.new(&block)
     end
 
     # Set the event as bubbling.
-    def bubbles=(value)
-      `#@native.bubbles = #{value}`
-    end
+    alias_native :bubbles=
 
     # Set the event as cancelable.
-    def cancelable=(value)
-      `#@native.cancelable = #{value}`
-    end
+    alias_native :cancelable=
   end
 
   module Target
diff --git a/opal/browser/event/before_unload.rb b/opal/browser/event/before_unload.rb
index 07bf528..5df430b 100644
--- a/opal/browser/event/before_unload.rb
+++ b/opal/browser/event/before_unload.rb
@@ -1,3 +1,5 @@
+# backtick_javascript: true
+
 module Browser; class Event
 
 class BeforeUnload < Event
diff --git a/opal/browser/event/clipboard.rb b/opal/browser/event/clipboard.rb
index 018763b..572f85d 100644
--- a/opal/browser/event/clipboard.rb
+++ b/opal/browser/event/clipboard.rb
@@ -1,3 +1,5 @@
+# backtick_javascript: true
+
 module Browser; class Event
 
 class Clipboard < Event
@@ -8,13 +10,8 @@ def self.supported?
   end
 
   class Definition < Definition
-    def data=(value)
-      `#@native.data = #{value}`
-    end
-
-    def type=(value)
-      `#@native.dataType = #{value}`
-    end
+    alias_native :data=
+    alias_native :type=, :dataType=
   end
 
   if Browser.supports? 'Event.constructor'
diff --git a/opal/browser/event/close.rb b/opal/browser/event/close.rb
index e181736..ead48a1 100644
--- a/opal/browser/event/close.rb
+++ b/opal/browser/event/close.rb
@@ -1,3 +1,5 @@
+# backtick_javascript: true
+
 module Browser; class Event
 
 class Close < Event
@@ -8,13 +10,8 @@ def self.supported?
   end
 
   class Definition < Definition
-    def code=(value)
-      `#@native.code = #{value}`
-    end
-
-    def reason=(value)
-      `#@native.reason = #{value}`
-    end
+    alias_native :code=
+    alias_native :reason=
 
     def clean!(value)
       `#@native.wasClean = true`
diff --git a/opal/browser/event/composition.rb b/opal/browser/event/composition.rb
index 88d3131..e992283 100644
--- a/opal/browser/event/composition.rb
+++ b/opal/browser/event/composition.rb
@@ -1,3 +1,5 @@
+# backtick_javascript: true
+
 module Browser; class Event
 
 class Composition < UI
@@ -8,13 +10,8 @@ def self.supported?
   end
 
   class Definition < UI::Definition
-    def data=(value)
-      `#@native.data = #{value}`
-    end
-
-    def locale=(value)
-      `#@native.locale = #{value}`
-    end
+    alias_native :data=
+    alias_native :locale=
   end
 
   if Browser.supports? 'Event.constructor'
diff --git a/opal/browser/event/custom.rb b/opal/browser/event/custom.rb
index c052a87..a47cf30 100644
--- a/opal/browser/event/custom.rb
+++ b/opal/browser/event/custom.rb
@@ -1,3 +1,5 @@
+# backtick_javascript: true
+
 require 'ostruct'
 
 module Browser; class Event
@@ -11,6 +13,8 @@ class Definition < Definition
     def method_missing(name, value)
       if name.end_with? ?=
         `#@native[#{name[0 .. -2]}] = value`
+      else
+        super
       end
     end
   end
@@ -51,12 +55,10 @@ def self.construct(name, desc)
 
   def initialize(event, callback = nil)
     super(event, callback)
-
-    @detail = Hash.new(`#{event}.detail`)
   end
 
   def method_missing(id, *)
-    return @detail[id] if @detail.has_key?(id)
+    `if (#@native.detail != null && Object.hasOwn(#@native.detail, id)) return #@native.detail[id]`
 
     super
   end
diff --git a/opal/browser/event/data_transfer.rb b/opal/browser/event/data_transfer.rb
index dba122e..555ec59 100644
--- a/opal/browser/event/data_transfer.rb
+++ b/opal/browser/event/data_transfer.rb
@@ -1,3 +1,5 @@
+# backtick_javascript: true
+
 require 'browser/blob'
 
 module Browser; class Event
@@ -92,4 +94,4 @@ def to_file
   end
 end
 
-end; end
\ No newline at end of file
+end; end
diff --git a/opal/browser/event/device_light.rb b/opal/browser/event/device_light.rb
index 402e2cb..252a14b 100644
--- a/opal/browser/event/device_light.rb
+++ b/opal/browser/event/device_light.rb
@@ -1,3 +1,5 @@
+# backtick_javascript: true
+
 module Browser; class Event
 
 class DeviceLight < Event
@@ -8,9 +10,7 @@ def self.supported?
   end
 
   class Definition < Definition
-    def value=(value)
-      `#@native.value = #{value}`
-    end
+    alias_native :value
   end
 
   if Browser.supports? 'Event.constructor'
diff --git a/opal/browser/event/device_motion.rb b/opal/browser/event/device_motion.rb
index 0f188d4..fccf39f 100644
--- a/opal/browser/event/device_motion.rb
+++ b/opal/browser/event/device_motion.rb
@@ -1,3 +1,5 @@
+# backtick_javascript: true
+
 module Browser; class Event
 
 class DeviceMotion < Event
@@ -10,21 +12,10 @@ def self.supported?
   Acceleration = Struct.new(:x, :y, :z)
 
   class Definition < Definition
-    def acceleration=(value)
-      `#@native.acceleration = #{value.to_n}`
-    end
-
-    def acceleration_with_gravity=(value)
-      `#@native.accelerationIncludingGravity = #{value.to_n}`
-    end
-
-    def rotation=(value)
-      `#@native.rotationRate = #{value}`
-    end
-
-    def interval=(value)
-      `#@native.interval = #{value}`
-    end
+    alias_native :acceleration=
+    alias_native :acceleration_with_gravity=, :accelerationIncludingGravity=
+    alias_native :rotation=, :rotationRate=
+    alias_native :interval=
   end
 
   if Browser.supports? 'Event.constructor'
diff --git a/opal/browser/event/device_orientation.rb b/opal/browser/event/device_orientation.rb
index 37e1465..099bff4 100644
--- a/opal/browser/event/device_orientation.rb
+++ b/opal/browser/event/device_orientation.rb
@@ -1,3 +1,5 @@
+# backtick_javascript: true
+
 module Browser; class Event
 
 class DeviceOrientation < Event
@@ -8,21 +10,10 @@ def self.supported?
   end
 
   class Definition < Definition
-    def absolute=(value)
-      `#@native.absolute = #{value}`
-    end
-
-    def alpha=(value)
-      `#@native.alpha = #{value}`
-    end
-
-    def beta=(value)
-      `#@native.beta = #{value}`
-    end
-
-    def gamma=(value)
-      `#@native.gamma = #{value}`
-    end
+    alias_native :absolute=
+    alias_native :alpha=
+    alias_native :beta=
+    alias_native :gamma=
   end
 
   if Browser.supports? 'Event.constructor'
diff --git a/opal/browser/event/device_proximity.rb b/opal/browser/event/device_proximity.rb
index 420f03c..11909c4 100644
--- a/opal/browser/event/device_proximity.rb
+++ b/opal/browser/event/device_proximity.rb
@@ -1,3 +1,5 @@
+# backtick_javascript: true
+
 module Browser; class Event
 
 class DeviceProximity < Event
@@ -8,17 +10,9 @@ def self.supported?
   end
 
   class Definition < Definition
-    def value=(value)
-      `#@native.value = #{value}`
-    end
-
-    def min=(value)
-      `#@native.min = #{value}`
-    end
-
-    def max=(value)
-      `#@native.max = #{value}`
-    end
+    alias_native :value=
+    alias_native :min=
+    alias_native :max=
   end
 
   if Browser.supports? 'Event.constructor'
diff --git a/opal/browser/event/drag.rb b/opal/browser/event/drag.rb
index bf46ec8..f6ec233 100644
--- a/opal/browser/event/drag.rb
+++ b/opal/browser/event/drag.rb
@@ -1,3 +1,5 @@
+# backtick_javascript: true
+
 module Browser; class Event
 
 class Drag < Event
@@ -12,25 +14,15 @@ class Definition < Definition
     class Client
       include Native::Wrapper
 
-      def x=(value)
-        `#@native.clientX = #{value}`
-      end
-
-      def y=(value)
-        `#@native.clientY = #{value}`
-      end
+      alias_native :x=, :clientX
+      alias_native :y=, :clientY
     end
 
     class Screen
       include Native::Wrapper
 
-      def x=(value)
-        `#@native.screenX = #{value}`
-      end
-
-      def y=(value)
-        `#@native.screenY = #{value}`
-      end
+      alias_native :x=, :screenX
+      alias_native :y=, :screenY
     end
 
     def alt!
diff --git a/opal/browser/event/focus.rb b/opal/browser/event/focus.rb
index 9493abb..18186b3 100644
--- a/opal/browser/event/focus.rb
+++ b/opal/browser/event/focus.rb
@@ -1,3 +1,5 @@
+# backtick_javascript: true
+
 module Browser; class Event
 
 class Focus < UI
@@ -8,13 +10,8 @@ def self.supported?
   end
 
   class Definition < UI::Definition
-    def view=(value)
-      `#@native.view = #{Native.convert(value)}`
-    end
-
-    def related=(elem)
-      `#@native.relatedTarget = #{Native.convert(elem)}`
-    end
+    alias_native :view=
+    alias_native :related=, :relatedTarget
   end
 
   if Browser.supports? 'Event.constructor'
diff --git a/opal/browser/event/gamepad.rb b/opal/browser/event/gamepad.rb
index 1e70f5f..06c85af 100644
--- a/opal/browser/event/gamepad.rb
+++ b/opal/browser/event/gamepad.rb
@@ -1,6 +1,8 @@
+# backtick_javascript: true
+
 module Browser; class Event
 
-class Gamepad < Event
+  class Gamepad < Event
   handles 'gamepadconnected', 'gamepaddisconnected'
 
   def self.supported?
diff --git a/opal/browser/event/hash_change.rb b/opal/browser/event/hash_change.rb
index f00d91c..d60a096 100644
--- a/opal/browser/event/hash_change.rb
+++ b/opal/browser/event/hash_change.rb
@@ -1,3 +1,5 @@
+# backtick_javascript: true
+
 module Browser; class Event
 
 class HashChange < Event
@@ -8,13 +10,8 @@ def self.supported?
   end
 
   class Definition < Definition
-    def old=(value)
-      `#@native.oldURL = #{value}`
-    end
-
-    def new=(value)
-      `#@native.newURL = #{value}`
-    end
+    alias_native :old=, :oldURL=
+    alias_native :new=, :newURL=
   end
 
   if Browser.supports? 'Event.constructor'
diff --git a/opal/browser/event/keyboard.rb b/opal/browser/event/keyboard.rb
index 58a5428..4205091 100644
--- a/opal/browser/event/keyboard.rb
+++ b/opal/browser/event/keyboard.rb
@@ -1,3 +1,5 @@
+# backtick_javascript: true
+
 module Browser; class Event
 
 class Keyboard < UI
diff --git a/opal/browser/event/message.rb b/opal/browser/event/message.rb
index 7571aaf..27fb046 100644
--- a/opal/browser/event/message.rb
+++ b/opal/browser/event/message.rb
@@ -1,3 +1,5 @@
+# backtick_javascript: true
+
 require 'buffer'
 
 module Browser; class Event
@@ -10,17 +12,9 @@ def self.supported?
   end
 
   class Definition < Definition
-    def data=(value)
-      `#@native.data = value`
-    end
-
-    def origin=(value)
-      `#@native.origin = value`
-    end
-
-    def source=(value)
-      `#@native.source = #{Native.convert(value)}`
-    end
+    alias_native :data=
+    alias_native :origin=
+    alias_native :source=
   end
 
   if Browser.supports? 'Event.constructor'
diff --git a/opal/browser/event/mouse.rb b/opal/browser/event/mouse.rb
index 5a5fab1..a628fd0 100644
--- a/opal/browser/event/mouse.rb
+++ b/opal/browser/event/mouse.rb
@@ -1,3 +1,5 @@
+# backtick_javascript: true
+
 module Browser; class Event
 
 class Mouse < UI
@@ -13,82 +15,51 @@ class Definition < UI::Definition
     class Client
       include Native::Wrapper
 
-      def x=(value)
-        `#@native.clientX = #{value}`
-      end
-
-      def y=(value)
-        `#@native.clientY = #{value}`
-      end
+      alias_native :x=, :clientX=
+      alias_native :y=, :clientY=
     end
 
     class Layer
       include Native::Wrapper
 
-      def x=(value)
-        `#@native.layerX = #{value}`
-      end
-
-      def y=(value)
-        `#@native.layerY = #{value}`
-      end
+      alias_native :x=, :layerX=
+      alias_native :y=, :layerY=
     end
 
     class Offset
       include Native::Wrapper
 
-      def x=(value)
-        `#@native.offsetX = #{value}`
-      end
-
-      def y=(value)
-        `#@native.offsetY= #{value}`
-      end
+      alias_native :x=, :offsetX=
+      alias_native :y=, :offsetY=
     end
 
     class Page
       include Native::Wrapper
 
-      def x=(value)
-        `#@native.pageX = #{value}`
-      end
-
-      def y=(value)
-        `#@native.pageY = #{value}`
-      end
+      alias_native :x=, :pageX=
+      alias_native :y=, :pageY=
     end
 
     class Screen
       include Native::Wrapper
 
-      def x=(value)
-        `#@native.screenX = #{value}`
-      end
-
-      def y=(value)
-        `#@native.screenY = #{value}`
-      end
+      alias_native :x=, :screenX=
+      alias_native :y=, :screenY=
     end
 
     class Ancestor
       include Native::Wrapper
 
-      def x=(value)
-        `#@native.x = #{value}`
-      end
-
-      def y=(value)
-        `#@native.y = #{value}`
-      end
-    end
-
-    def x=(value)
-      `#@native.screenX = #{value}`
+      alias_native :x=
+      alias_native :y=
     end
 
-    def y=(value)
-      `#@native.screenY = #{value}`
-    end
+    alias_native :x=, :screenX=
+    alias_native :y=, :screenY=
+    alias_native :button=
+    alias_native :related=, :relatedTarget=
+    alias_native :from=, :fromElement=
+    alias_native :to=, :toElement=
 
     def alt!
       `#@native.altKey = true`
@@ -102,10 +73,6 @@ def meta!
       `#@native.metaKey = true`
     end
 
-    def button=(value)
-      `#@native.button = #{value}`
-    end
-
     def client
       Client.new(@native)
     end
@@ -129,18 +96,6 @@ def screen
     def ancestor
       Ancestor.new(@native)
     end
-
-    def related=(elem)
-      `#@native.relatedTarget = #{Native.try_convert(elem)}`
-    end
-
-    def from=(elem)
-      `#@native.fromElement = #{Native.try_convert(elem)}`
-    end
-
-    def to=(elem)
-      `#@native.toElement = #{Native.try_convert(elem)}`
-    end
   end
 
   if Browser.supports? 'Event.constructor'
diff --git a/opal/browser/event/page_transition.rb b/opal/browser/event/page_transition.rb
index 3835412..69cdd2c 100644
--- a/opal/browser/event/page_transition.rb
+++ b/opal/browser/event/page_transition.rb
@@ -1,3 +1,5 @@
+# backtick_javascript: true
+
 module Browser; class Event
 
 class PageTransition < Event
@@ -8,9 +10,7 @@ def self.supported?
   end
 
   class Definition < Definition
-    def persisted=(value)
-      `#@native.persisted = #{value}`
-    end
+    alias_native :persisted=
   end
 
   if Browser.supports? 'Event.PageTransition'
diff --git a/opal/browser/event/pop_state.rb b/opal/browser/event/pop_state.rb
index 2ffc200..249b636 100644
--- a/opal/browser/event/pop_state.rb
+++ b/opal/browser/event/pop_state.rb
@@ -1,3 +1,5 @@
+# backtick_javascript: true
+
 module Browser; class Event
 
 class PopState < Event
@@ -9,7 +11,7 @@ def self.supported?
 
   class Definition < Definition
     def state=(value)
-      `#@native.state = #{value}`
+      alias_native :state=
     end
   end
 
diff --git a/opal/browser/event/progress.rb b/opal/browser/event/progress.rb
index 6fe513a..9f5e053 100644
--- a/opal/browser/event/progress.rb
+++ b/opal/browser/event/progress.rb
@@ -1,3 +1,5 @@
+# backtick_javascript: true
+
 module Browser; class Event
 
 class Progress < Event
@@ -8,17 +10,9 @@ def self.supported?
   end
 
   class Definition < Definition
-    def computable=(value)
-      `#@native.computableLength = #{value}`
-    end
-
-    def loaded=(value)
-      `#@native.loaded = #{value}`
-    end
-
-    def total=(value)
-      `#@native.total = #{value}`
-    end
+    alias_native :computable=, :computableLength=
+    alias_native :loaded=
+    alias_native :total=
   end
 
   if Browser.supports? 'Event.constructor'
diff --git a/opal/browser/event/sensor.rb b/opal/browser/event/sensor.rb
index 1dc0a97..5a1ff38 100644
--- a/opal/browser/event/sensor.rb
+++ b/opal/browser/event/sensor.rb
@@ -1,3 +1,5 @@
+# backtick_javascript: true
+
 module Browser; class Event
 
 class Sensor < Event
diff --git a/opal/browser/event/storage.rb b/opal/browser/event/storage.rb
index e02b258..8beaac7 100644
--- a/opal/browser/event/storage.rb
+++ b/opal/browser/event/storage.rb
@@ -1,3 +1,5 @@
+# backtick_javascript: true
+
 module Browser; class Event
 
 class Storage < Event
@@ -8,25 +10,11 @@ def self.supported?
   end
 
   class Definition < Definition
-    def key=(value)
-      `#@native.key = #{value}`
-    end
-
-    def new=(value)
-      `#@native.newValue = #{value}`
-    end
-
-    def old=(value)
-      `#@native.oldValue = #{value}`
-    end
-
-    def area=(value)
-      `#@native.storageArea = #{value}`
-    end
-
-    def url=(value)
-      `#@native.url = #{value}`
-    end
+    alias_native :key=
+    alias_native :new=, :newValue=
+    alias_native :old=, :oldValue=
+    alias_native :area=, :storageArea=
+    alias_native :url=
   end
 
   if Browser.supports? 'Event.constructor'
diff --git a/opal/browser/event/touch.rb b/opal/browser/event/touch.rb
index eb51436..1022b82 100644
--- a/opal/browser/event/touch.rb
+++ b/opal/browser/event/touch.rb
@@ -1,3 +1,5 @@
+# backtick_javascript: true
+
 module Browser; class Event
 
 class Touch < Event
diff --git a/opal/browser/event/ui.rb b/opal/browser/event/ui.rb
index 34a53d7..8ce7d66 100644
--- a/opal/browser/event/ui.rb
+++ b/opal/browser/event/ui.rb
@@ -1,3 +1,5 @@
+# backtick_javascript: true
+
 module Browser; class Event
 
 class UI < Event
@@ -6,13 +8,8 @@ def self.supported?
   end
 
   class Definition < Definition
-    def detail=(value)
-      `#@native.detail = #{value}`
-    end
-
-    def view=(value)
-      `#@native.view = #{value}`
-    end
+    alias_native :detail=
+    alias_native :view=
   end
 
   if Browser.supports? 'Event.constructor'
diff --git a/opal/browser/event/wheel.rb b/opal/browser/event/wheel.rb
index 7290ccc..9876525 100644
--- a/opal/browser/event/wheel.rb
+++ b/opal/browser/event/wheel.rb
@@ -1,3 +1,5 @@
+# backtick_javascript: true
+
 module Browser; class Event
 
 class Wheel < UI
@@ -8,17 +10,9 @@ def self.supported?
   end
 
   class Definition < Definition
-    def x=(value)
-      `#@native.deltaX = #{value}`
-    end
-
-    def y=(value)
-      `#@native.deltaY = #{value}`
-    end
-
-    def z=(value)
-      `#@native.deltaZ = #{value}`
-    end
+    alias_native :x=, :deltaX=
+    alias_native :y=, :deltaY=
+    alias_native :z=, :deltaZ=
 
     def mode=(value)
       value = case value
diff --git a/opal/browser/version.rb b/opal/browser/version.rb
index def5c48..e427ec4 100644
--- a/opal/browser/version.rb
+++ b/opal/browser/version.rb
@@ -1,3 +1,3 @@
 module Browser
-  VERSION = '0.3.3'
+  VERSION = '0.3.4'
 end
diff --git a/spec/event_spec.rb b/spec/event_spec.rb
index 3401f07..cec9fef 100644
--- a/spec/event_spec.rb
+++ b/spec/event_spec.rb
@@ -1,3 +1,5 @@
+# backtick_javascript: true
+
 require 'spec_helper'
 require 'browser/event'
 
@@ -153,4 +155,45 @@
       expect(count).to eq(3)
     end
   end
+
+  describe "#trigger" do
+    it "can set properties of custom events" do
+      elem  = $document["event-spec"]
+
+      count = 0
+      cb = elem.on :abcabc do |e|
+        count += e.thing
+      end
+
+      elem.trigger :abcabc do |e|
+        e.thing = 6
+      end
+
+      expect(count).to eq(6)
+
+      cb.off
+    end
+
+    it "works with non-enumerable properties" do
+      elem = $document["event-spec"]
+
+      count = 0
+      cb = elem.on :abcabcd do |e|
+        count += e.thing
+      end
+
+      elem.trigger :abcabcd do |e|
+        %x{
+          Object.defineProperty(e.native, "thing", {
+            value: 6,
+            enumerable: false
+          });
+        }
+      end
+
+      expect(count).to eq(6)
+
+      cb.off
+    end
+  end
 end