on-tap is not triggered when pressing enter key

[filaraujo]

<polymer-element name="demo-test" attributes="">
            <template>
                <style>
                    :host {
                        display: block;
                    }
                </style>
                <button name="button" on-tap="{{ doSomething }}">doSomethingOnTap</button>
                <button name="button" on-click="{{ doSomething }}">doSomethingOnClick</button>
            </template>
            <script>
                Polymer('demo-test', {
                    doSomething: function() {
                        alert('something');
                    }
                });
            </script>
        </polymer-element>

<demo-test></demo-test>