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<script src="https://unpkg.com/vue@3"></script>
<script>
    const { createApp } = Vue
    createApp({
        data(){
            return {
                message:'hello'
            }
        }
    }).mount('#app')
</script>
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<script type="importmap">
    {
        "imports":{
            "vue":"https://unpkg.com/vue@3/dist/vue.esm-browser.js"
        }
    }
</script>
<script type="module">
    import { createApp } from 'vue';
    createApp({
        data(){
            return {
                message:'hello'
            }
        }
    }).mount('#app')
</script>