March 2020 web platform update

Now widely available on the web platform
Widely available

font-stretch: The font-stretch CSS property selects a font face from a font family based on width, either by a keyword such as condensed or a percentage. Learn more.
Intl: The Intl API provides language sensitive string comparison, number formatting, date and time formatting, and more. Learn more.
Media capture: The navigator.mediaDevices.getUserMedia() API requests access to devices that produce audio or video streams, such as microphones or video cameras. Learn more.
Resource timing (initial support): PerformanceResourceTiming entries report when network events happen while loading a resource, such as when connections start and end. You can use this information to measure loading times. Learn more.

font-optical-sizing: The font-optical-sizing CSS property sets whether text rendering is optimized for viewing at different sizes. Learn more.
Q unit: The Q CSS length unit is an absolute length anchored to the physical measurement of quarter-millimeters. 1Q is equivalent to 1/40 of 1 centimeter. Learn more.
Import and export of mutable globals (WebAssembly): Mutable global variables are importable and exportable. Learn more.
Web animations: The animate() method of Element objects programmatically animates elements over time and can synchronize the animations of multiple elements. Learn more.