Apple is asking developers testing the latest seeds to concentrate on subpixel rendering, which is now on by default for all Web content. According to the release notes, websites with in-app Web views may render differently depending on design constraints.
Additionally, the company requests focus on extension compatibility.
As for the new WebKit features, Apple notes the following:
- WebGL. Safari support for WebGL allows developers to create 3D experiences
that work natively without plug-ins.
- IndexedDB. The IndexedDB API allows web developers to store structured
data for web applications that work online or require large amounts of data to
be cached client side.
work with asynchronous programming patterns.
- CSS Shapes and Compositing. Using CSS, websites can now easily ??'ow text
around images and geometry shapes, and perform image compositing
operations on DOM elements.
Developers can download Safari 7.1 for Mavericks and version 6.2 for Mountain Lion via Apple's Developer Portal.