October 2019 web platform update

Now widely available on the web platform

Widely available

• Async functions: The async and await keywords allow you to use the asynchronous, promise-based behavior of a function without using promise chains. Learn more.

• Custom properties: Custom properties are CSS properties prefixed with -- that set values you can reuse with the var() function. For example, you can set a --key-color property to reuse as border-color: var(--key-color). Also known as CSS variables. Learn more.

Now available in Firefox

Limited availability

• Two-value display property: The display CSS property accepts multiple keyword values, such as inline flex or block flow, to explicitly set an element's inner and outer layout mode. Also known as 2-value, multi-keyword, or multiple value syntax. Learn more.