CSS Properties and Values
CSS variables have stronger support in CSS Properties and Values API Level 1. Using it, variables can be registered as custom attributes to ensure that they are always of a specific type.
Native File System
The new Native File System API (Local File System API), currently an experimental function, enables developers to build powerful Web applications and interact with files on user's local devices, such as IDE, photo and video editors, text editors, etc. After the user grants access rights, this API allows the Web application to read or save changes to files and folders on the user's device directly. It does all this by calling the platform's own "Open and Save" dialog box. The following figure shows the pages invoked using the dialog box opened on the Mac.
SMS Receiver API
The site uses text messages to verify phone numbers and sends a one-time password for manual entry of forms. The native platform provides an API that provides programmatic access to such messages, allowing users to skip manual interaction with forms.
Other features in this release
Apply opacity to the default style of INPUT/TEXTAREA placeholders
Pop-up windows are not allowed when (page unload) pages are unloaded from memory
Improve Web Socket, Faster
Redaction address in PaymentRequest.onshippingaddresschange event
Synchronization XHR is not allowed in page deletion
Delete XSS Audito
For more details, see the release notes: