dom-manipulation

Question 1

What is the className property of element objects?

Answer 1

it gives you the class name of that element

Question 2

How do you update the CSS class attribute of an element using JavaScript?

Answer 2

.className

Question 3

What is the textContent property of element objects?

Answer 3

its a property that stores any text present as content in an element

Question 4

How do you update the text within an element using JavaScript?

Answer 4

var.textContent = newTextContent

Question 5

Is the event parameter of an event listener callback always useful?

Answer 5

the vast majority of the time; yes
but every once in a while you will need to be very very precise and only need it for one variable

Question 6

Would this assignment be simpler or more complicated if we didn’t use a variable to keep track of the number of clicks?

Answer 6

it would be more complicated because you would need to search the dom for clicks if you chose not to use a variable

Question 7

Why is storing information about a program in variables better than only storing it in the DOM?

Answer 7

so that you can keep all your data in javascript instead of having to search the dom all the time.
security and functionality concerns