কম্প্যাটিবিলিটি টেস্টিং

JavaScript features unsupported in older browsers

CSS rendering differences causing layout breaks

Touch vs. mouse interaction differences

Mobile-specific memory and performance issues

Progressive enhancement gaps breaking core functionality

Browser-specific API behavior differences

Reach users across all environments

Reduce environment-specific bug reports

Prevent "works on my machine" production issues

Maintain consistent brand experience everywhere