Absolute Free Web-Development-Applications Exam Practice for Comprehensive Preparation 

Given the following code:

Which type of form validation is used?  

```javascript

function square(number) {

return number * number;

}

```

Which keyword causes the function to send back a result?

```css

p {

margin: 10px 20px 25px 30px;

}

```

How many pixels is the top margin?

Which type of user input does the developer request by specifying the pattern attribute?