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App.vue
main.js
 
<template>
  <p>Using the '.prop' shorthand so that 'v-bind:indeterminate.prop' becomes '.indeterminate':</p>
  <button v-on:click="indetVal = !indetVal">Toggle</button>
  <p>
    <input type="checkbox" .indeterminate="indetVal"> Checkbox
  </p>
</template>

<script>
export default {
  data() {
    return {
      indetVal: false
    };
  }
};
</script>

<style scoped>
input {
  margin: 10px;
  scale: 2;
}
</style>                  
http://localhost:5173/