Website:Browser Compatibility Statement
As of November 2010, this matrix covers 98% of requests.
|Win XP||Win 7||Mac 10.5||Mac 10.6|
Grade Level Definitions
A-grade support is the highest support level. By taking full advantage of the powerful capabilities of modern web standards, the A-grade experience provides advanced functionality and visual fidelity.
A-grade browsers are identified on a whitelist. Approximately 96% of our audience enjoys an A-grade experience.
Summary: A-grade browsers are identified, capable, modern and common. QA tests all A-grade browsers, and bugs are addressed with high priority.