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Cross-browser compatibility is the ability of a website or web application to function across different browsers and degrade gracefully when browser features are absent or lacking.[not verified in body]
Creation of W3C and Web standardization
In the early part of the century, practices such as browser sniffing were deemed unusable for cross-browser scripting. The term "multi-browser" was coined to describe applications that relied on browser sniffing or made otherwise invalid assumptions about run-time environments, which at the time were almost invariably Web browsers. The term "cross-browser" took on its currently accepted meaning at this time as applications that once worked in Internet Explorer 4 and Netscape Navigator 4 and had since become unusable in modern browsers could not reasonably be described as "cross-browser". Colloquially, such multi-browser applications, as well as frameworks and libraries are still referred to as cross-browser.
Cross Browser Compatibility
Not to be confused with multi-browser compatible, cross browser compatible applications and websites will be stable in any version of a browser. The ability of a site to be easily viewed across different browsers is essential to usability for Internet users. A web application behaves exactly as desired in one browser but might have other issues in another browsers. So the issues will hamper the vigorous functionality of an application.