Level 3 of 7 · siblings are set up first, mounted together
Two children mount
App renders a Header and a Footer. Both are set up before either is mounted.
What happensThe page loads. App renders <Header /> then <Footer />.
App.vue
Header.vue
Footer.vue
<!-- App.vue -->
<Header />
<Footer />Deck · tap a card to add it, or drag it into place
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