Microsoft Edge 原始试用版开发人员控制台
在固定时间段内进行安全试验，并通过 Microsoft Edge 原始试用版提供有关新平台功能的反馈
Microsoft PARAKEET Polyfill Testing
To enable the evaluation of PARAKEET by interested parties, we have created a Javascript based implementation built on top of existing web technologies. This polyfill will give developers early and frequent access to test the latest API shape and ergonomics for PARAKEET with test & prod data traffic while also allowing us to iterate quickly and address any changes needed prior to making this a part of the web platform natively.
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Protocol Launch Timing Extension to PerformanceNavigationTiming
To help web applications compute end-to-end telemetry for protocol launches we propose adding 2 new fields userAgentStart and protocolLaunchStart to the PerformanceNavigationTiming object. The parameter userAgentStart corresponds to a timestamp captured early in the startup of the browser application. The parameter protocolLaunchStart corresponds to the time when user action that initiated the protocol launch in the non-browser client application. For cold starts; when no browser process has yet been created; the protocolLaunchStart value will be lesser than the userAgentStart value. For warm starts; where one or more browser processes are already running; the protocolLaunchStart value may be higher than the userAgentStart value. These new fields are only populated for protocol launches.
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xHE-AAC Support for Edge on Windows
The MsMediaFoundationXHeAac origin trial allows web sites to use MediaSource.isTypeSupported to query the supportability of xHE-AAC audio mimeType by the user agent. If xHE-AAC audio decoding is supported, the user agent can only support the playback of xHE-AAC encoded audio through the MSE/EME protected media path.
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Trust Tokens API
This is a new API for propagating a notion of user authenticity across sites, without using cross-site persistent identifiers like third party cookies.
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HTML 'focusgroup' Attribute
This experimental attribute provides a grouping mechanism for a set of child focusable elements, and automatically enables arrow-key navigation among them. Focusgroups can be configured with a variety of options to suit particular layouts, and can be linked together to form hierarchies for non-trivial UI components. We are seeking feedback on the utility of the feature set, the ease of integration with web components (and Shadow DOM in particular), and any additional functionality you feel may be missing. Additional features are described in the explainer and will be made available during Origin Trial.
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