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Don’t Go for a FRONTEND Interview Without Understanding These 30 Browser-Related Topics

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SumitM
3 min readJan 26, 2025

As a frontend developer, your expertise is not just in writing HTML, CSS, and JavaScript but also in understanding how browsers work to render these elements into interactive web experiences. Here’s a comprehensive list of 30 browser-related topics you should know before stepping into any technical interview.

1. Components of a Browser and the Critical Rendering Path

  • Rendering Engine: This is where the HTML and CSS are parsed to create the DOM (Document Object Model) and CSSOM (CSS Object Model).
  • JavaScript Engine: Executes JavaScript code, which might manipulate the DOM.
  • Networking: Manages HTTP requests to fetch resources. Understanding the critical rendering path helps in optimizing load times by ensuring the browser constructs and renders the page as efficiently as possible.

2. Browser Processes

  • Modern browsers use a multi-process architecture for improved performance and stability. This contrasts with older single-threaded models where one script could block the entire page.

3. DOM and CSSOM

  • The DOM tree is constructed from HTML, while CSSOM is built from CSS, affecting how elements are styled.
  • Synchronous vs. Asynchronous Rendering: Synchronous blocks rendering until scripts are executed, while asynchronous…

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SumitM
SumitM

Written by SumitM

Author of a bestselling Java e-book | Dedicated to shaping the next gen of developers. https://msumit.gumroad.com/l/qturr

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