I have been working as a QA engineer and my daily rolls and responsibilities is as following: 1) CSS validation 2) HTML or XHTML validation 3) Page validations with and without JavaScript enabled 4) Ajax and JQeury functionality 5) Font size validation 6) Page layout in different resolutions 7) All images and alignment 8 ) Header and footer sections 9) Page content alignment to center, LHS or RHS 10). Functional testing, 11). regression and retesting, 12). Validation testing, 13). Unit testing, 14). Mobile app testing 15). Usability testing. very familiar with mantis bug management tool.