April 2017 web platform update

Newly available on the web platform

Newly 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.

• font-feature-settings: The font-feature-settings CSS property sets low-level OpenType feature tags for a font. When possible, use font-variant instead. Learn more.

• String padStart() and padEnd(): The padStart() and padEnd() methods of strings return a string lengthened to a minimum number of characters by adding characters to the start or end of the string. Learn more.