Which of the following specifies the width of an outline?

outline-size
outline-width
outline-height
both a and b

The correct answer is B. outline-width.

Outline-width is a CSS property that specifies the width of an outline. It is a length value, and the default value is 0.

Outline-size is a CSS property that specifies the size of an outline. It is a length value, and the default value is 0.

Outline-height is a CSS property that specifies the height of an outline. It is a length value, and the default value is 0.

Therefore, the only property that specifies the width of an outline is outline-width.

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