HTML5 HTML5 Web Storage and APIs 2

Question 1

Which HTML5 API allows web pages to run scripts in background threads?

Accepted Answer

Web Workers API

Answer

The Web Workers API lets you run JavaScript in a separate background thread, preventing heavy computations from blocking the main UI thread.

Question 2

What is the main use case of the Service Worker API?

Accepted Answer

Enabling offline functionality and caching via a proxy between browser and network

Answer

Service Workers act as a network proxy, enabling offline support, background sync, and push notifications by intercepting fetch requests.

Question 3

Which method removes a specific item from localStorage?

Accepted Answer

localStorage.removeItem(key)

Answer

The removeItem(key) method removes the key-value pair with the specified key from localStorage.

Question 4

What does the HTML5 Drag and Drop API's 'dataTransfer' object do?

Accepted Answer

Holds the data being dragged during a drag-and-drop operation

Answer

The dataTransfer object holds the data and state of a drag-and-drop operation, allowing you to set and retrieve data being dragged.

Question 5

Which HTML5 API allows a web page to request full-screen mode for an element?

Accepted Answer

Fullscreen API

Answer

The Fullscreen API provides methods like requestFullscreen() to display a specific element in full-screen mode.

HTML5 - HTML5 Web Development Practice Test