Cross-Browser Compatibility & Testing MCQs

16 MCQs — Multiple Browsers MCQs (Page 1 of 2)

Practice Cross-Browser Compatibility & Testing MCQs with correct answers and explanations. These questions are from the Multiple Browsers MCQs section.

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Multiple Browsers Subcategories

Browser Engines & History	Caching & Performance
Cross-Browser Compatibility & Testing	Developer Tools
Mobile & Embedded Browsers	Permissions & Browser Policies
Privacy, Cookies & Storage	Security Features

Which website is commonly used to check which browsers support a given HTML, CSS, or JavaScript feature?

w3schools.com/validate
whois.com
pagespeed.dev only
caniuse.com

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What is a polyfill?

An image compression tool
A CSS reset
Code that implements a missing modern feature in older browsers
A browser extension

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Which approach is recommended for handling browser differences?

Writing separate sites for each browser
Blocking unsupported browsers
Feature detection (checking whether an API exists) rather than User-Agent sniffing
Parsing the User-Agent string

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What were vendor prefixes such as -webkit-, -moz-, and -ms- used for in CSS?

Loading fonts
Experimental or non-standard implementations of CSS features in specific engines
Marking comments
Defining media queries

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Which tool automates real browsers (Chrome, Firefox, Edge, Safari) through browser-specific drivers such as chromedriver and geckodriver?

Postman
Selenium WebDriver
Wireshark
JUnit only

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What is a headless browser?

A browser without a homepage
A browser without JavaScript
A text-only browser such as Lynx
A browser that runs without a visible user interface, used for automated testing and scraping

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What does a web page that works in Chrome but breaks in Safari most likely indicate?

The page needs Flash
The server is down
The DNS is wrong
The page uses a feature or behavior that WebKit does not support, or supports differently

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Which plugin technology reached end of life in all major browsers in 2020–2021?

JavaScript
PDF viewing
Adobe Flash Player
WebAssembly

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What is WebAssembly (Wasm)?

A Chrome-only plugin
A new version of HTML
A CSS framework
A binary instruction format that runs at near-native speed in all major browsers

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Why must service workers run on HTTPS (except on localhost)?

Because HTTP lacks cookies
Because they are written in Java
To speed up caching
They can intercept and modify network requests, so they need a secure origin to prevent tampering

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