Which color value will create a background color that is semitransparent?

In a grid layout, which property will create gaps between the rows in the grid?

You are creating a responsive design, but when you view your site on a smaller screen, you notice that images are causing a horizontal scroll bar. How can you solve this problem without stretching any images out of shape?

The CSS box model describes how the parts of a CSS box fit together and the size of the box. What is the actual width of the following box's visible part under the standard box model? box {width: 200px; padding: 10px; margin: 0 15px; border: 2px 5px;}

Which CSS property will not trigger layout recalculation?

Which attribute must have a unique value each time it is used in an HTML document?

When might an empty alt attribute be the correct value?

Why would you surround a piece of text with

Variables declared with the let keyword have what type of scope?