package com.vaadin.polymer.elemental;

import static jsinterop.annotations.JsPackage.GLOBAL;
import jsinterop.annotations.JsProperty;
import jsinterop.annotations.JsType;

@JsType(isNative=true, namespace=GLOBAL)
public interface DOMTokenList {

    @JsProperty
    int getLength();

    boolean contains();
}

@@ -300,11 +300,160 @@
 tains();
+%0A%0A    void add(String token);%0A%0A    void remove(String token);%0A%0A    void replace(String token, String replacement);%0A%0A    boolean toggle(String token);
 %0A%7D%0A

Make DOMTokenList mutable