Cross browser web development.

The important challenge for any web developer is making the website work in many different types of browsers(IE, FireFox, Safari, and Chrome) and also in different browser versions.
To achieve this, we may need to write separate code for each browser if same code behaves differently in each browser, and need to use the respecive code based on the browser type.

In server side coding, it can be done using USER_AGENT. In client side coding it can be handled using 'navigator.appName' in javascript.

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