Apple’s iPhone presents a revolutionary user interface and interaction model. Users can view webpages,use web applications, and use built-in iPhone features, such as the email application, the iPod, andthe digital camera, wherever they go. Safari on iPhone, a unique implementation of Safari, is theapplication users use to browse the web on both iPhone and iPod touch. Note: Safari on iPhone behaves the same on iPhone and iPod touch except when users tap links to iPhone-only applications. See “Using iPhone Application Links” in Safari Web Content Guide for iPhonefor more information about links that behave differently on iPod touch. This document introduces you to the iPhone environment and how it shapes the user experience ofiPhone content. Then, it explains how to design a superlative user interface for your web content soit displays and works well on iPhone. It does this by first examining different types of iPhone contentand exploring how you can decide which type to create. It then discusses how to apply user interfacedesign principles to iPhone content, and finally provides numerous metrics and guidelines to helpyou handle specific design issues. For the implementation details and guidance you need to writethe code for your iPhone product, see the “See Also” section below.