Test methodology
What does Responsive Layout Capabilities measure?
It measures layout correctness and responsive behavior after controlled viewport and component-size changes. It does not measure layout speed.
Which viewport profiles are tested?
The profiles are mobile portrait at 360 x 640, tablet portrait at 768 x 1024, and desktop landscape at 1280 x 720.
How is responsive-layout coverage calculated?
The 19 testable established behaviors have equal weight. One limited-availability diagnostic and checks that cannot run reliably are excluded from coverage.
How is this different from CSS Capabilities?
CSS Capabilities checks individual CSS features. Responsive Layout Capabilities verifies that multiple layout features work together during controlled resizing.
Does the visible responsive preview affect the result?
No. It demonstrates the layout changes. Scoring evidence comes from isolated controlled frames.
How to interpret the result
The result reports established responsive-layout behavior across controlled viewport and component-size changes. Limited-availability diagnostics are separate.