diff --git a/opal/browser/dom/element/input.rb b/opal/browser/dom/element/input.rb
index 63109f5..1bcd700 100644
--- a/opal/browser/dom/element/input.rb
+++ b/opal/browser/dom/element/input.rb
@@ -20,6 +20,14 @@ def checked?
     `#@native.checked`
   end
 
+  def check!
+    `#@native.checked = 'checked';`
+  end
+
+  def uncheck!
+    `#@native.checked = '';`
+  end
+
   def clear
     `#@native.value = ''`
   end