23-05-2026

Second Mock Interview

title: "Technical Interview Prep: Core HTML & CSS Concepts"

published: false

description: "Quick breakdown of essential web development concepts covering units, semantics, selectors, and Flexbox layout from my second mock interview."

tags: webdev, beginners, css, html

Sharing my notes from my second mock interview! Here is a quick breakdown of essential web development concepts.

1. Units: px vs vh

The main difference lies in whether the unit is fixed or fluid .

px (Pixel) : An absolute, fixed unit representing the smallest digital image point.

vh (Viewport Height) : A relative unit based on the browser window height.

Quick Reference

200px stays exactly 200 pixels wide on mobile, laptop, or 4K monitors.

1vh = 1% of the current viewport height.

100vh = 100% of the viewport height (fills the full screen vertically).

2. Structure: <footer> vs <div>

The core difference here is Semantics (meaning).

<div> (Division) : A generic, non-semantic block element.…