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Lesser-Known but Advanced Senior Frontend Interview Questions

Saurabh Mhatre
JavaScript in Plain English
5 min readFeb 10, 2025

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Lesser-Known but Advanced Senior Frontend Interview Questions

Hey everyone, continuing with the JSInterview30 series, today we are going to cover some lesser-known questions which are asked in senior frontend developer interviews. So let’s begin…

Q1.What is a render tree?

We all have heard about the DOM tree in HTML but don’t hear about the Render Tree often which makes it crucial to understand for preparation of senior-level interviews.
The render tree is a crucial concept in how browsers render a webpage. It is the structure that combines visual and layout information from the DOM tree and CSSOM tree, allowing the browser to determine what needs to be displayed and how it should appear on the screen. It is a tree-like structure of visual elements (render objects) that represent the content of the page.

Each node in the render tree corresponds to a visible element on the screen, combining:

  • DOM nodes (content).
  • CSSOM rules (styles like colours, sizes, visibility, etc.).

The render tree excludes non-visual elements, like <head> or elements styled with display: none; from its final representation. For each visible DOM node, a corresponding render object (render tree node) is created.

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Written by Saurabh Mhatre

Senior Frontend Developer with 9+ years industry experience. Content creator on Youtube and Medium. LinkedIn/Twitter/Instagram: @SaurabhNative

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