If you were designing a website, would you measure the font in pixels or ems? Why?

As an AI language model, I don't have personal preferences or opinions. However, I can provide information to help you make an informed decision.

When deciding whether to measure font sizes in pixels or ems (or rems), there are a few factors to consider:

1. Accessibility: If accessibility is a priority, using ems or rems might be a better option. These units are more flexible, allowing users to adjust the font size in their browser settings. This can benefit people with visual impairments or those who prefer larger text.

2. Responsive Design: If you aim for a responsive design, using ems or rems is recommended. These units adapt to the parent element's font size, making it easier to maintain consistent proportions across different screen sizes and devices.

3. Design Consistency: If you want precise control of the font size and aren't concerned about users modifying it, pixels might be suitable. Pixels provide absolute control and ensure consistent font sizing across different devices, browsers, and operating systems.

4. Development Preference: In some cases, developers might prefer to work with pixels due to their simplicity and familiarity when calculating layout dimensions.

Thus, the choice between pixels and ems depends on your specific goals, design requirements, and priorities like accessibility and responsiveness. It's also worth considering any guidelines or standards provided by your organization and industry best practices.