Question 1

What is Vapor mode in Vue 3.5+ and how does it differ from the virtual DOM?

Accepted Answer

**Target Audience:** Vue developers who know templates and reactivity and want to understand Vapor mode precisely, including its release status. No compiler background needed. **Difficulty:** Hard > **How to read this doc:** Ideas are explained in plain language first, then tagged with 📌 Interview term: so you also learn the words an interviewer listens for. Vapor output in this doc was produced with **vue 3.6.0-rc.12**, a release candidate: compiled with its @vue/compiler-s

Question 2

When should you choose Vapor over VDOM in a real app — trade-offs?

Accepted Answer

**Target Audience:** Senior Vue developers and tech leads deciding whether and where to adopt Vapor mode. Assumes you know what Vapor is; if not, read [What is Vapor mode](/interview-question/what-is-vapor-mode-in-vue-3-5-and-how-does-it-differ-from-the-virtual-dom) first. **Difficulty:** Hard > **How to read this doc:** Ideas are explained in plain language first, then tagged with 📌 Interview term: so you also learn the words an interviewer listens for. All numbers here were meas

Question 3

What is a custom renderer in Vue (createRenderer)?

Accepted Answer

**Target Audience:** Vue developers curious about how Vue is structured internally, or evaluating Vue for a non-DOM target (canvas, 3D, terminal, native). **Difficulty:** Hard > **How to read this doc:** Ideas are explained in plain language first, then tagged with 📌 Interview term: so you also learn the words an interviewer listens for. The runnable example passed scripts/verify-vue-example.mjs on Vue 3.5.44 (compiled and mounted in jsdom, button clicked). The termin

VUE.JSDECODED.

Hard

What is Vapor mode in Vue 3.5+ and how does it differ from the virtual DOM?

When should you choose Vapor over VDOM in a real app — trade-offs?

What is a custom renderer in Vue (createRenderer)?