Debug wrong DOM attributes in unknown framework

Q: Debug wrong DOM attributes in unknown framework

This question evaluates a candidate's ability to debug frontend DOM attribute mismatches by understanding framework-specific attribute/prop reflection, template/JSX compilation, SSR/hydration differences, and build-toolchain interactions.

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Question

Frontend Debugging Plan: Incorrect DOM Attributes in an Unfamiliar Framework

Context

You join a team using an unfamiliar frontend framework. In the browser DevTools, rendered DOM elements show incorrect attributes (e.g., className rendered instead of class, mis-cased data-*/aria-* attributes, or boolean props serialized as strings). You need to quickly isolate the root cause, implement a fix, and prevent regressions.

Task

Outline a step-by-step debugging plan that covers:

Creating a minimal reproduction.
Inspecting template-to-DOM compilation or JSX/TSX transforms.
Checking SSR vs client hydration mismatches.
Verifying component prop passthrough and attribute reflection (especially for custom elements).
Auditing build tooling and plugins.
Confirming reserved or framework-specific props behavior.
Isolating the root cause, implementing a fix, and adding safeguards (lint rules, type checks, tests) to prevent regressions.

Debug wrong DOM attributes in unknown framework

Frontend Debugging Plan: Incorrect DOM Attributes in an Unfamiliar Framework

Context

Task

Solution

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Debug wrong DOM attributes in unknown framework

Overview

Frontend Debugging Plan: Incorrect DOM Attributes in an Unfamiliar Framework

Context

Task

Solution

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