Which of the following measurement is relative to 1% of the height of the viewport?

ch
rem
%
vh

The correct answer is D. vh.

A viewport is the area of a web page that is visible in a browser window. The height of the viewport is the height of the browser window minus the height of the browser’s toolbars and status bar.

A vh unit is a relative unit of measurement that is equal to 1% of the height of the viewport. This means that a vh unit will always be the same size, regardless of the size of the browser window.

The other options are not relative units of measurement. A ch unit is a relative unit of measurement that is equal to the height of the current font. A rem unit is a relative unit of measurement that is equal to the font size of the root element. A % unit is a relative unit of measurement that is equal to a percentage of the parent element’s size.

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