<template v-for> key should be placed on the <template> tag.

Yes, in Vue.js, the `key` attribute should be placed on the element that is being repeated, not on the `<template>` tag itself. The `key` attribute is used to give each item in the list a unique identifier, allowing Vue.js to efficiently update and re-render the list when it changes.

Here's an example of how to use the `key` attribute correctly with the `v-for` directive:

<template v-for="item in items" :key="item.id">
  <div>{{ item.name }}</div>
</template>

In this example, the `key` attribute is placed on the `<div>` element, which is the element being repeated in the loop. The value of `item.id` is used as the unique identifier for each item in the list.

By using the `key` attribute correctly, you can help Vue.js optimize the rendering of lists and improve performance.