Web Development Web Development 3

Question 1

What is the difference between localStorage and sessionStorage in browsers?

Accepted Answer

localStorage persists until cleared; sessionStorage clears when the tab closes

Answer

localStorage persists indefinitely across sessions, while sessionStorage is cleared when the browser tab or window is closed.

Question 2

In JavaScript, what does the 'Event Loop' primarily manage?

Accepted Answer

Executing callback functions from the task queue when the call stack is empty

Answer

The event loop continuously checks if the call stack is empty, then pushes pending callbacks from the queue for execution.

Question 3

Which HTML element is semantically correct for the main navigation links of a website?

Accepted Answer

<nav>

Answer

The <nav> element is the semantic HTML5 landmark element specifically designed for major navigation link sections.

Question 4

What problem does CSS specificity solve?

Accepted Answer

It decides which CSS rule applies when multiple rules target the same element

Answer

CSS specificity is a weight system that determines which conflicting rule takes precedence when multiple selectors target the same element.

Question 5

Which JavaScript Promise method runs all promises in parallel and rejects as soon as any one fails?

Accepted Answer

Promise.all()

Answer

Promise.all() executes all promises concurrently and short-circuits with a rejection if any single promise rejects.

Web Development Practice Test