Is ::first-line a pseudo-element?

To create more space within a CSS3 button use:

To have a box-shadow inside of the div use:

Which one of these is not a font-weight descriptor in CSS3?

Is the following valid? "box-shadow: -5px -5px -5px #ccc;"

What does this code do? @import url("mystyle.css");

Which is not a valid value for the font-smooth property?

If the following rule is used, what will be the output? :focus,:active { outline-offset: 10px }

To which element can the min-width property not be applied?

Which property allow percentages in their value fields?

Which style is not valid for an image?