class  {
    onCreate() {
        this.state = { count: 0 };
    }
}

<macro|input| name="fragment">
    <${input}/>
</macro>

<div.root key="root">
    <fragment>
        <if(state.count === 0)>
            <span>a</span>
            <span>b</span>
        </if>
        <fragment>
            <span>c</span>
        </fragment>
    </fragment>
</div>