VueJS: Can't get elm from vnode in render function?

Question

Vue.js

Guys, please tell me why it is impossible to get elm from vnode in the render function? can i solve it somehow?

render (h) {
    this.$slots.default.forEach(vnode => {
      console.log(vnode.elm) // undefined
    })

    return h('div', {
      class: 'v-box'
    }, this.$slots.default)
  }

Maybe I just missed something. I'm trying to write a specific image grid, for this I need the sizes of all the images (in this case, the slots) and having obtained the sizes, calculate everything that is needed.
But due to the fact that I can not get the element, nothing happens.

Answer 1

Because they don't exist, the data will be there after the data is rendered https://vuejs.org/v2/guide/instance.html#Lifecycle...