BroadcastChannel
BroadcastChannel allows scripts from the same origin but other browsing contexts (windows, workers) to send each other messages.
CSS background-position edge offsets
Allows CSS background images to be positioned relative to the specified edge using the 3 to 4 value syntax. For example: `background-position: right 5px bottom 5px;` for positioning 5px from the bottom-right corner.
CSS font-palette
The font-palette CSS property allows selecting a palette from a color font. In combination with the `@font-palette-values` at-rule, custom palettes can be defined.
CSS hanging-punctuation
Allows some punctuation characters from start (or the end) of text elements to be placed "outside" of the box in order to preserve the reading flow.
CSS Relative colors
The CSS Relative Color syntax allows a color to be defined relative to another color using the `from` keyword and optionally `calc()` for any of the color values.
EOT - Embedded OpenType fonts
Type of font that can be derived from a regular font, allowing small files and legal use of high-quality fonts. Usage is restricted by the file being tied to the website
CSS Font Loading
This CSS module defines a scripting interface to font faces in CSS, allowing font faces to be easily created and loaded from script. It also provides methods to track the loading status of an individual font, or of all the fonts on an entire page.
accept attribute for file input
Allows a filter to be defined for what type of files a user may pick with from an `<input type="file">` dialog
Directory selection from file input
The `webkitdirectory` attribute on the `<input type="file">` element allows entire directory with file contents (and any subdirectories) to be selected.
Media Source Extensions
API allowing media data to be accessed from HTML `video` and `audio` elements.
Push API
API to allow messages to be pushed from a server to a browser, even when the site isn't focused or even open in the browser.
'SameSite' cookie attribute
Same-site cookies ("First-Party-Only" or "First-Party") allow servers to mitigate the risk of CSRF and information leakage attacks by asserting that a particular cookie should only be sent with requests initiated from the same registrable domain.
Scoped attribute
Deprecated method of allowing scoped CSS styles using a "scoped" attribute. Now [removed from the specification](https://github.com/whatwg/html/issues/552) and replaced by the [@scope CSS rule](/css-cascade-scope).
Signed HTTP Exchanges (SXG)
Part of the Web Packaging spec, Signed HTTP Exchanges allow a different origin server to provide a resource, and this will be treated as if it came from the original server. This can be used with AMP CDNs, for example, to allow the original URL to be displayed in the URL bar.
mediasession api
headers http header: x-frame-options: allow-from
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