What are the important aspects in Web testing? | Web Services Testing Interview Questions

Functional Testing (includes links testing, navigation testing etc...),
Security Testing,
Database Testing (includes Data integrity, data manipulations, data retrievals etc..),
Performance Testing (includes all types of performance like Load Testing, Stress Testing, Spike Testing, Endurance Testing and Data volume Testing),
Usability Testing,
Navigation testing,
Configuration Testing,
Compatibility Testing,
Reliability Testing,
Availability Testing,
Scalability Testing Etc...