Safari Technology Preview, a new version of its Safari web browser, is designed specifically for developers and is Apple's foray into the area of web development

It offers developers a sneak peek into what the Safari of the future would look and work like – including the latest visual effects and layout technologies - while giving them the opportunity to influence the direction it takes via feedback.

What you can do with Safari Technology Preview:

• Preview the latest advances in Safari web technologies, including HTML, JavaScript, and CSS.
• It supports ECMAScript 6, the latest iteration of the JavaScript programming language.
• Use the latest version of Web Inspector and Responsive Design Mode to modify, debug, and optimise websites.
• Use Bug Reporter to send feedback to the people building them when it’s most useful — early in development.
• The app works side-by-side with the current version of Safari, so you can continue to use and reference the current release.
• It supports the full set of iCloud-based Safari features, including iCloud History and iCloud Tabs.
• The WebKit blog keeps you up-to-date on the latest developments in HTML, JavaScript, and CSS.

Give it a try: You can experiment with these technologies by downloading Safari Technology Preview (OS X 10.11.4 or later) from Apple’s developer pages. Updates occur every few weeks and include the most recent additions and improvements to WebKit (the rendering engine that powers Safari).