Modern Web Design with HTML5, CSS3, and JavaScript - Using requestAnimationFrame() Method for Simple Counter

This video tutorial introduces the use of requestAnimationFrame in JavaScript to create a simple counter. It begins with setting up an HTML page with an H1 tag and a script. The tutorial then explains how to use requestAnimationFrame to perform animations by creating a step counter function. The counter is implemented to count milliseconds up to 5000, and the tutorial demonstrates how to update and format the output using string manipulation. The video concludes with a demonstration of the counter running smoothly and accurately.

What is the initial text set in the H1 tag during the HTML setup?

• JavaScript

• Counter

• Hello World

• Animation

What is the primary purpose of the requestAnimationFrame method?

• To perform an animation

• To log data to the console

• To create a new HTML element

• To fetch data from a server

Which function is used as a callback in requestAnimationFrame?

• updateFrame

• startAnimation

• stepCounter

• initCounter

What is the initial value set for the 'start' variable in the step counter?

• 5000

• 1000

• undefined

• 0

How is the count value updated in the step counter?

• By adding a fixed number

• By subtracting the current counter value from the start

• By multiplying by a factor

• By dividing by a constant

What method is used to round the count value before displaying it?

• Math.abs

• Math.floor

• Math.ceil

• Math.round

How are milliseconds extracted from the string representation of the count?

• Using replace

• Using split

• Using slice

• Using substring