Safari 12.0.1 (High Sierra)

What's new in this version:

Web Animations:
- Implemented getTiming() and updateTiming()
- Implemented Animation.updatePlaybackRate()
- Changed to not reset pending tasks when setting a null effect
- Made document.getAnimations() return declarative animations in the correct order
- Updated the API to allow the auto composite value
- Updated the Web Animations API to remove all of the ReadOnly interfaces

Intersection Observer:
- Added support to allow cross-document intersection observing
- Fixed isIntersecting computation when 0 is not a threshold
- Updated to account for CSS zoom when computing client rects

CSS:
- Added CSS Custom Properties API Support for syntax="*" and with proper cycle handling
- Fixed container to update when the prefers-color-scheme media query changes
- Fixed CSS grid elements with justify-content:space-around that have extra whitespace
- Implemented text-underline-offset and text-decoration-thickness

WebRTC:
- Added support for sender and receiver getCapabilities
- Added onremovetrack support for RTCPeerConnection removed tracks
- Changed MediaRecorder to fire dataavailable event when all tracks are ended and stop() is called
- Fixed calling sender.replaceTrack() twice producing a new transceiver and its corresponding m= section
- Fixed sender.replaceTrack() fails with InvalidStateError if the transceiver.direction is “inactive”
- Fixed RTCTrackEvent.streams should be SameObject
- Updated to prevent revealing device IDs until the user has granted permission to capture
- Updated enumerateDevices to not expose devices that are not available to getUserMedia
- Updated to prevent prompting the user again after denying a getDisplayMedia request

Rendering:
- Fixed requestAnimationFrame causing bad location of position:fixed inside overflow:auto and iframe
- Fixed overlays with -webkit-overflow-scrolling:touch to become scrollable after added text makes it taller

Web Inspector:
- Added low-power video playback enter and exit events in Timelines and Network waterfalls
- Added support to show save and restore stack for recorded 2D Canvases
- Added missing context menu items for links in the Styles sidebar
- Added support to toggle selected properties by pressing Space or ⌘/ (Command-/) in the Styles sidebar
- Added support for multiple selection and multiple deletion of cookie records
- Created a setting for auto-recording newly created contexts in the Canvas tab
- Implemented copying and deletion of multiple properties in the Styles sidebar
- Updated to capture changes to (i.e., canvas size) that would affect the recorded context in the Canvas tab

Storage:
- Added a storage limit for IndexedDB
- Changed IndexedDB to allow storing RTCCertificate

Media:
- Fixed MediaSource.isTypeSupported('video/mp4; codecs="hvc1.1.6.L60.B0') getting improperly rejected

Payment Request:
- Changed the errorFields of PaymentResponse.retry() to be optional

Security UI:
- Added a warning in the Smart Search field when loading non-secure pages