How does responsive design affect test results across devices?

Responsive design creates testing complexity because variants may perform differently across devices:

Device-specific rendering means the "same" test may present differently on mobile versus desktop. A design that wins on desktop might lose on mobile.

Segment your analysis by device type to identify divergent patterns. Overall results may mask important device-specific insights.

Consider device distribution in your audience. If 70% open on mobile, mobile experience matters more than desktop perfection.

Test mobile-specific elements separately: touch target sizes, scroll length, image sizing, and single-column focus.

Account for rendering differences across email clients. What works in Apple Mail may break in Outlook.

Responsive design is not one design, it is many. Testing must account for how each variant actually appears to different audience segments.