File viewer iframe too high when set to parent height using sizeToParent

When setting the iframe of a fileviewer module to take up the parent's space by setting the 'sizeToParent' data-option to true when importing the Javascript library, the resulting iframe takes up more space than is available in the host window.

I did not test if this also applies to other modules.

See attached screenshot. Notice the scrollbar indicating the file viewer iframe goes beyond the bottom of the page.