A grid ruler in software testing (especially in UI/UX testing) is used mainly for visual layout validation
Alignment Checking:
- Ensures that elements like buttons, images, text boxes, and links are properly aligned with each other.
- Helps catch misaligned components that might not be obvious by just looking casually.
Consistent Spacing Validation:
- Verifies that padding and margins between UI components are consistent according to design guidelines.
- For example, making sure there’s a 16px space between cards across all screens.
Responsive Testing Support:
- When resizing screens (for mobiles, tablets, desktops), a grid ruler helps testers ensure that elements stay aligned and spaced properly across different screen sizes.
Pixel-Perfect UI Testing:
- In pixel-perfect testing, testers check if the developed UI matches the design mockups exactly.
- Using a grid ruler, you can measure dimensions, check symmetry, and spot minor inconsistencies.
Accessibility Checks:
- Proper alignment and spacing also affect accessibility. For example, consistent layouts help users with visual impairments better navigate the page with screen readers.