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A student assumes that because rem and em are described as “modern spacing units,” they must only work inside modern layout systems like Flexbox or Grid, and won’t function in an older layout built without them. Is that assumption correct?

A developer wants to know what “root em” means as a way to remember what rem is calculated relative to. What’s accurate?

Ironclad Auto Repair’s service-menu table has a section header, ‘Brake Services’, that needs to visually span across both the ‘Service’ and ‘Price’ columns in its own row, sitting above the individual line items. What accomplishes this?

A martial arts dojo’s nav links only respond to clicks when a visitor’s cursor is precisely over the link text itself, not the surrounding padded area. What CSS change fixes this?

A designer wants to make an existing blue slightly darker without changing which color family it belongs to or how vivid it looks.

A student building a personal portfolio site for Comet Comics asks why the lesson specifically warns against tables for layout, given that colspan and rowspan seem flexible enough to arrange anything. What’s the actual reasoning behind the caution?

A developer needs to choose between em and rem for padding on a deeply nested element, where several ancestor elements each have their own font-size declared. What’s a key practical difference to be aware of?

A dojo styles its nav links with a background-color change that applies identically for both :hover and :focus. What does grouping nav a:hover, nav a:focus together in one rule accomplish?

Select the steps of the public health approach to gun violence designed by the CDC and WHO: 

Licensing and accreditation are both examples of state’s exercising their public health __________ powers.