Vue 3 Teleport for Modals and Global Overlays

// components/AppModal.vue
<template>
  <teleport to="#modal-root">
    <div v-if="show" class="modal-overlay" @click.self="close">
      <div class="modal-content">
        <slot></slot>
        <button @click="close">Close</button>
      </div>
    </div>
  </teleport>
</template>

<script setup>
import { defineProps, defineEmits } from 'vue';

const props = defineProps({
  show: Boolean
});

const emit = defineEmits(['close']);

function close() {
  emit('close');
}
</script>

<style scoped>
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
}
.modal-content {
  background: white;
  padding: 20px;
  border-radius: 8px;
  min-width: 300px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}
</style>

// index.html (ensure this element exists in your public/index.html)
<!-- ... other html ... -->
<div id="app"></div>
<div id="modal-root"></div>

// App.vue
<template>
  <div>
    <h1>My Application</h1>
    <button @click="isModalOpen = true">Open Modal</button>
    <AppModal :show="isModalOpen" @close="isModalOpen = false">
      <h2>Hello from the Modal!</h2>
      <p>This content is rendered outside the normal Vue app mounting point.</p>
    </AppModal>
  </div>
</template>

<script setup>
import { ref } from 'vue';
import AppModal from './components/AppModal.vue';

const isModalOpen = ref(false);
</script>