HTML CSS and JavaScript for Beginners - A Web Design Course - Change Styles DOM

The video tutorial discusses the advantages of using classes for element selection in JavaScript, highlighting the efficiency of class-based selection over individual property updates. It demonstrates how to apply styles to elements using JavaScript, including changing background colors and manipulating style attributes. The tutorial further explores advanced style manipulation techniques, such as adjusting borders, font sizes, and display properties. Finally, it encourages viewers to practice these techniques and provides tips for effective styling, emphasizing the importance of understanding JavaScript objects and style properties.

What method is used to select elements by their class name in JavaScript?

• getElementById

• getElementsByClassName

• querySelector

• querySelectorAll

When applying styles using JavaScript, which attribute is updated?

• class

• id

• style

• data

How do you change the background color of an element to green using JavaScript?

• element.style.backgroundColor = 'green'

• element.style.background = 'green'

• element.style.borderColor = 'green'

• element.style.color = 'green'

What must you remember to do when specifying style properties in JavaScript?

• Use double quotes

• Use semicolons

• Use quotes around property names

• Use single quotes

Which property would you modify to hide an element using JavaScript?

• opacity

• hidden

• visibility

• display

What is the effect of setting an element's display property to 'block'?

• It makes the element inline

• It makes the element visible as a block

• It removes the element from the DOM

• It hides the element

Why is it important to practice the selection process in JavaScript?

• To improve typing speed

• To ensure correct element manipulation

• To learn new programming languages

• To debug JavaScript code