The Resource Timing API received an update and will soon include a renderBlockingStatus field to find render-blocking resources.
Topic: JavaScript – Page 6
Use the CSS Font Loading API to detect if a font is available in a browser.
Learn why the new script type
importmapimproves static file caching.Learn how to use a JavaScript Proxy to map object properties to
fetchcalls.The JavaScript "fetch" HTTP method supports a
keepaliveoption to replaceNavigator..sendBeacon()