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It's a set of tests used by browser makers to ensure interoperability, so your web content operates the way you expect across browsers. One way to measure that is web platform tests. We made a really big effort this year to improve Safari's interoperability with other browsers. But first, there's some really great news I want to share up front. I'll give you a tour of the new features and enhancements in WebKit and shipping in Safari 13.1 for macOS, Safari on iOS and iPadOS 13.4 and coming to Safari 14 on macOS, iOS an iPadOS. If you develop websites, web apps save to the home screen, or Web content used in apps, and want to learn about all of the latest technologies available in Safari and WebKit, this session is for you. I'm so excited to get to tell you about all of the new features and improvements for web developers this year. Hello and welcome to WWDC Hello I'm Jon Davis, Web Technologies evangelist for the Safari and WebKit teams.