diff --git a/jslib/src/html5/core.kt b/jslib/src/html5/core.kt
new file mode 100644
index 00000000000..7cadb690977
--- /dev/null
+++ b/jslib/src/html5/core.kt
@@ -0,0 +1,63 @@
+package html5
+
+import js.annotations.Native
+
+Native
+class Context() {
+    fun save() {}
+    fun restore() {}
+
+    fun scale(x : Double, y : Double) {}
+    fun rotate(angle : Double) {}
+    fun translate(x : Double, y : Double) {}
+
+    fun fillRect(x : Double, y : Double, w : Double, h : Double) {}
+    fun strokeRect(x : Double, y : Double, w : Double, h : Double) {}
+
+    var globalAlpha : Double = 1.0;
+    var strokeStyle : String = ""
+    var fillStyle : String = ""
+    var lineWidth : Double = 1.0
+    var shadowOffsetX : Double = 0.0
+    var shadowOffsetY : Double = 0.0
+    var shadowBlur : Double = 0.0
+    var shadowColor : String = ""
+    var font : String = ""
+
+    fun beginPath() {}
+    fun moveTo(x : Double, y : Double) {}
+    fun closePath() {}
+
+    fun lineTo(x : Double, y : Double) {}
+    fun quadraticCurveTo(cpx : Double, cpy : Double, x : Double, y : Double) {}
+    fun bezierCurveTo(cp1x : Double, cp1y : Double, cp2x : Double, cp2y : Double, x : Double, y : Double) {}
+    fun arcTo(x1 : Double, y1 : Double, x2 : Double, y2 : Double, radius : Double) {}
+    fun arc(x : Double, y : Double, radius : Double, startAngle : Double, endAngle : Double, anticlockwise : Boolean= false) {}
+
+    fun rect(x : Double, y : Double, w : Double, h : Double) {}
+    fun fill() {}
+    fun stroke() {}
+
+    fun fillText(text : String, x : Double, y : Double) {}
+    fun fillText(text : String, x : Double, y : Double, maxWidth : Double) {}
+    fun strokeText(text : String, x : Double, y : Double) {}
+    fun strokeText(text : String, x : Double, y : Double, maxWidth : Double) {}
+
+    fun measureText(text : String)  : TextMetrics = TextMetrics();
+}
+
+Native
+class TextMetrics() {
+    val width : Int = 0
+}
+
+Native
+fun getContext() : Context = Context();
+
+Native
+fun random() : Double = 0.0
+
+Native
+fun getCanvasWidth() : Double = 0.0
+Native
+fun getCanvasHeight() : Double = 0.0
\ No newline at end of file
diff --git a/translator/src/org/jetbrains/k2js/translate/operation/OperatorTable.java b/translator/src/org/jetbrains/k2js/translate/operation/OperatorTable.java
index bcc4d882721..29796ce9483 100644
--- a/translator/src/org/jetbrains/k2js/translate/operation/OperatorTable.java
+++ b/translator/src/org/jetbrains/k2js/translate/operation/OperatorTable.java
@@ -13,7 +13,7 @@ import java.util.Map;
  * @author Pavel Talanov
  */
 
-//TODO: change using guava builders
+//TODO: refactor using guava builders
 public final class OperatorTable {
 
     private static final Map<JetToken, JsBinaryOperator> binaryOperatorsMap = new HashMap<JetToken, JsBinaryOperator>();
diff --git a/translator/testFiles/kotlin_lib.js b/translator/testFiles/kotlin_lib.js
index fab347c438f..ba7106ec77d 100644
--- a/translator/testFiles/kotlin_lib.js
+++ b/translator/testFiles/kotlin_lib.js
@@ -460,6 +460,10 @@
         }
     );
 
+    Kotlin.collectionsMax = function(col, comp) {
+
+    };
+
     Kotlin.StringBuilder = Kotlin.Class.create(
         {
             initialize:function () {