diff --git a/samples/html5Canvas/src/stubGenerator/kotlin/idl.kt b/samples/html5Canvas/src/stubGenerator/kotlin/idl.kt
index dfa9b17bc53..52fa6cfe7cb 100644
--- a/samples/html5Canvas/src/stubGenerator/kotlin/idl.kt
+++ b/samples/html5Canvas/src/stubGenerator/kotlin/idl.kt
@@ -5,9 +5,9 @@ import org.jetbrains.kotlin.konan.jsinterop.tool.Type.*
 // This shall be an output of Web IDL parser.
 val all = listOf(
     Interface("Context", 
-        Attribute("lineWidth", Integer, hasSetter = true),
-        Attribute("fillStyle", idlString, hasSetter = true),
-        Attribute("strokeStyle", idlString, hasSetter = true),
+        Attribute("lineWidth", Integer),
+        Attribute("fillStyle", idlString),
+        Attribute("strokeStyle", idlString),
 
         Operation("lineTo", Void, Arg("x", Integer), Arg("y", Integer)),
         Operation("moveTo", Void, Arg("x", Integer), Arg("y", Integer)),
@@ -19,10 +19,10 @@ val all = listOf(
         Operation("closePath", Void)
     ),
     Interface("DOMRect",
-        Attribute("left", Integer, hasGetter = true),
-        Attribute("right", Integer, hasGetter = true),
-        Attribute("top", Integer, hasGetter = true),
-        Attribute("bottom", Integer, hasGetter = true)
+        Attribute("left", Integer),
+        Attribute("right", Integer),
+        Attribute("top", Integer),
+        Attribute("bottom", Integer)
     ),
     Interface("Canvas",
         Operation("getContext", InterfaceRef("Context"), Arg("context", idlString)),
@@ -32,8 +32,8 @@ val all = listOf(
         Operation("getElementById", Object, Arg("id", idlString))
     ),
     Interface("MouseEvent",
-        Attribute("clientX", Integer, hasGetter = true),
-        Attribute("clientY", Integer, hasGetter = true)
+        Attribute("clientX", Integer, readOnly = true),
+        Attribute("clientY", Integer, readOnly = true)
     ),
     Interface("Response",
         Operation("json", Object)
@@ -42,7 +42,7 @@ val all = listOf(
         Operation("then", InterfaceRef("Promise"), Arg("lambda", Function))
     ),
     Interface("__Global",
-        Attribute("document", InterfaceRef("Document"), hasGetter = true),
+        Attribute("document", InterfaceRef("Document"), readOnly = true),
 
         Operation("fetch", InterfaceRef("Promise"), Arg("url", idlString)),
         Operation("setInterval", Void, Arg("lambda", Function), Arg("interval", Integer))
diff --git a/samples/html5Canvas/src/stubGenerator/kotlin/stubGenerator.kt b/samples/html5Canvas/src/stubGenerator/kotlin/stubGenerator.kt
index 28605299f38..8aca2908981 100644
--- a/samples/html5Canvas/src/stubGenerator/kotlin/stubGenerator.kt
+++ b/samples/html5Canvas/src/stubGenerator/kotlin/stubGenerator.kt
@@ -15,7 +15,7 @@ object Object: Type
 object Function: Type
 
 data class Attribute(val name: String, val type: Type, 
-    val hasGetter: Boolean = false, val hasSetter: Boolean = false): Member
+    val readOnly: Boolean = false): Member
 
 data class Arg(val name: String, val type: Type)
 
@@ -76,9 +76,9 @@ fun Type.wasmReturnMapping(value: String): String {
         is Void -> ""
         is Integer -> value
         is Floating -> value
-        is idlString -> TODO("Implement me")
+        is idlString -> "TODO(\"Implement me\")"
         is Object -> "JsValue(ArenaManager.currentArena, $value)"
-        is Function -> TODO("Implement me")
+        is Function -> "TODO(\"Implement me\")"
         is InterfaceRef -> "$name(ArenaManager.currentArena, $value)"
         else -> error("Unexpected type")
     }
@@ -132,7 +132,6 @@ fun Attribute.generateKotlinSetter(parent: Interface): String {
 }
 
 fun Attribute.generateKotlinGetter(parent: Interface): String {
-    //val kotlinType = type.toKotlinType()
     return "    get() {\n" +
     "      val wasmRetVal = ${wasmGetterName(name, parent.name)}(${(parent.wasmReceiverArgs + parent.wasmReturnArg()).joinToString(", ")})\n" + 
     "      return ${type.wasmReturnMapping("wasmRetVal")}\n"+
@@ -142,9 +141,10 @@ fun Attribute.generateKotlinGetter(parent: Interface): String {
 
 fun Attribute.generateKotlin(parent: Interface): String {
     val kotlinType = type.toKotlinType(name)
-    return "  var $name: $kotlinType\n" +
-    (if (hasGetter) generateKotlinGetter(parent) else "    get() = error(\"There is no getter for $name\")\n") + 
-    (if (hasSetter) generateKotlinSetter(parent) else "    set(_) = error(\"There is no setter for $name\")\n")
+    val varOrVal = if (readOnly) "val" else "var"
+    return "  $varOrVal $name: $kotlinType\n" +
+    generateKotlinGetter(parent) +
+    if (!readOnly) generateKotlinSetter(parent) else ""
 }
 
 val Interface.wasmTypedReceiverArgs get() = 
@@ -171,8 +171,8 @@ fun Attribute.generateWasmGetterStub(parent: Interface): String {
     "external public fun $wasmGetter($allArgs): Int\n\n"
 }
 fun Attribute.generateWasmStubs(parent: Interface) =
-    (if (hasGetter) generateWasmGetterStub(parent) else "") +
-    (if (hasSetter) generateWasmSetterStub(parent) else "")
+    generateWasmGetterStub(parent) +
+    if (!readOnly) generateWasmSetterStub(parent) else ""
 
 // TODO: consider using virtual mathods
 fun Member.generateKotlin(parent: Interface): String {
@@ -310,8 +310,8 @@ fun Attribute.generateJsGetter(parent: Interface): String {
 }
 
 fun Attribute.generateJs(parent: Interface) =
-    (if (hasGetter) generateJsGetter(parent) else "") + 
-    (if (hasSetter) generateJsSetter(parent) else "") 
+    generateJsGetter(parent) + 
+    if (!readOnly) ",\n${generateJsSetter(parent)}" else ""
 
 fun Member.generateJs(parent: Interface): String {
     return when (this) {