Date: 2018-08-26
| Standard/feature | Relation | Status |
|---|---|---|
| Web Packaging | Privacy-preserving preloading from cache under publisher URL | Initial version of spec final. Shipping in Chrome M73, IETF concensus seeking in progress |
| Portals | AMP Carousel like UI with navigation to publisher (alternative to iframe promotion) | Iterating on spec. Prototype implementation in Chromium |
| Performance Timeline | Real world metric collection. This is the framework. New metrics may be needed. | Shipping in first browsers |
| Paint Timing 1 | Initial paint related metrics (performance assessment | Shipping in first browsers |
| Perf metric: (Initial) Layout stability | Metric for how often layout changes without user action based on elements resizing (such as when an unsized image loads or an iframe resizes) | Standard draft published. Implemented in Chromium |
| Perf metric: Largest Contentful Pain | Better metric to reflect user perceived page load time | Standard draft published. Implemented in Chromium |
| Perf metric: Expected Queueing Time | Metric for how long it takes for main thread to react to user action | Feasibility exploration |
| Iframe performance isolation | Possible under current standards, but requires browsers to implement. Reduces need for embeds to behave well | Chrome has 2 efforts in progress (Site isolation, cooperative multitasking). Other browser plans unknown. |
| Feature Policy | Allows web pages to turn off legacy features or opt into new behavior. This is the framework. New policies may be needed | Shipping in first browsers |
| Transfer size policy: Limit amount of main thread JS | Incentivize off-main-thread computation. | Just an idea. |
| Feature Policy: Prevent navigation without user action | Similar to iframe sandbox but for top level window. | Just an idea. |
| CSP: Stricter CSP in pre-render mode | Allow pages to restrict and make it observable what they cannot do when being pre-rendered. | Just an idea. |
| Feature Policy: No unsized media | Prevent media (images) to resize based on intrinsic size | Under discussion |
| Feature Policy: No uncomposited animations | Allow pages to opt into only running animations that can be composited on the GPU. | Just an idea. |
| Responsive image preload | Allows pre-loading of responsive images. | Under discussion. In Chrome behind a flag. |