Using `Teleport` for Modals and Global Overlays

// components/ModalDialog.vue
<template>
  <teleport to="body">
    <div v-if="isOpen" class="modal-backdrop" @click.self="closeModal">
      <div class="modal-content">
        <h2>{{ title }}</h2>
        <slot></slot>
        <button @click="closeModal">Close</button>
      </div>
    </div>
  </teleport>
</template>

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

const props = defineProps({
  isOpen: {
    type: Boolean,
    required: true,
  },
  title: {
    type: String,
    default: 'Modal Title',
  },
});

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

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

<style scoped>
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  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;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  min-width: 300px;
  text-align: center;
}
</style>

// App.vue
<template>
  <div>
    <h1>Teleport Example</h1>
    <button @click="showModal = true">Open Modal</button>
    
    <ModalDialog :is-open="showModal" title="My Awesome Modal" @close="showModal = false">
      <p>This content is rendered in the modal.</p>
      <p>Even though it's declared here, it teleports to the body!</p>
    </ModalDialog>
  </div>
</template>

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

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