Below is the answer and explanation for the question which describes how a service worker operates?
Which describes how a service worker operates?
It runs a programmable network proxy ✅
It doesn’t handle network requests coming from the navigation on the website
It can be used only when the user is browsing the website
None of th...
Below is the answer for the question which of the following statements is true about the mobile experience of users?
Which of the following statements is true about the mobile experience of users?
It’s important to show as much information as possible on the visible part of a mobile site
Users are willing to accept longer load times for high-resolution images...
Below is the answer and explanation for the question what is it that the app shell helps with
What is it that the app shell helps with
Creating a fully optimized site
Improves elements of the UX
Making the full page load faster
Making transitions between pages faster ✅
correct answer
Making transiti...
Below is the answer and explanation for the question why did Facebook create “2G Tuesdays”?
Why did Facebook create “2G Tuesdays”?
To understand how people on 2G use their product ✅
To run a random experiment
Most users are on 2G
Facebook didn’t create “2G Tuesdays”
correct answer
To understand how...
Below is the answer and explanation for the question which is an example of a situation when an unnecessary resource negatively impacts the user experience.
Which is an example of a situation when an unnecessary resource negatively impacts the user experience.
Optimized images
Lazy loading
One web font
A photo carousel on the homepage tha...
Below is the answer and explanation for the question using a mix of desktop and mobile-optimized pages on mobile sites improves the user experience since some users are more familiar with the desktop version of the site.
Using a mix of desktop and mobile-optimized pages on mobile sites improves the user experience since some users are more familiar with the desktop version of the site.
Below is the answer and explanation for the question which components often account for most of the downloaded bytes on a web page?
Which components often account for most of the downloaded bytes on a web page?
Fonts
Articles
JavaScript
Images ✅
correct answer
Images ✅
explanation...
Below is the answer for the question how can you make the job a lot simpler for the browser?
How can you make the job a lot simpler for the browser?
Follow the style guide
Add more parents
Change the selector to a class ✅
Create more complex CSS
correct answer
Change the selector to a class ✅
Below is the answer and explanation for the question what’s the fastest and best-optimized resource?
What’s the fastest and best-optimized resource?
An image
The one not sent ✅
Javascript
Web fonts
correct answer
The one not sent ✅
explanation
The fastest and best-optimi...
Below is the answer and explanation for the question which allows for efficient font reuse between pages?
Which allows for efficient font reuse between pages?
The local() directive
The font matching algorithm
Revalidation token ✅
WOFF2 fonts
correct answer
Revalidation token ✅
expla...