When component needs a single root element?
Interviewer Expectations for this Question
01
Core Competency
Assesses fundamental understanding of Vue.js conventions, runtime behavior, and memory/performance considerations.
02
Evaluation Criteria
Hiring managers look for precision, avoidance of ambiguous jargon, and ability to explain trade-offs under real production conditions.
Comprehensive Model Answer
Verified Solution
In VueJS 2.x, every component must have a single root element when template has more than one element. In this
case, you need to wrap the elements with a parent element.
<template>
<div class="todo-item">
<h2>{{ title }}</h2>
<div v-html="content"></div>
</div>
</template>
Otherwise there will an error throwing, saying that "Component template should contain exactly one root
element...".
Whereas in 3.x, components now can have multiple root nodes. This way of adding multiple root nodes is called as
fragments.
<template>
<h2>{{ title }}</h2>
<div v-html="content"></div>
</template>
****
Candidate Response Strategy & Interview Tips
- Start with a concise one-sentence summary: Deliver a direct, confident answer first before expanding into nuances.
- Demonstrate real-world trade-offs: Discuss where this approach excels and when you would avoid it in production systems.
- Discuss complexity & edge cases: Proactively explain time/space complexity or boundary conditions (null values, scale limits).
- Prepare for interviewer follow-ups: Technical hiring panels frequently probe deeper into concurrency, backward compatibility, or alternative libraries.