Ability of a product to work with different input/output devices and rendering software. Including printers, email, mobile devices and different browsers.

• Cross Browser: Cross-browser refers to the ability of a website, web application, HTML construct or client-side script to function in environments that provide its required features and to bow out or degrade gracefully when features are absent or lacking.
• E-Mail: Preparing HTML based electronic mail.
• Keyboard: Working with keyboard input in a web browser.
• Mobile: Development of websites optimized for viewing on smartphone and tablet devices.
• Printers: Manipulation of printer output through CSS.
• Responsive Web Design (RWD): RWD responds to the needs of the users and the devices they’re using. The layout changes based on the size and capabilities of the device.
• Web Accessibility: Web accessibility means that people with disabilities can perceive, understand, navigate, and interact with the Web, and that they can contribute to the Web.