March 2019 web platform update

Now widely available on the web platform

Widely available

• Array copyWithin(): The copyWithin() method of arrays and typed arrays shifts or copies items of an array to another index of the array without changing its length. Learn more.

• Array fill(): The fill() method of arrays and typed arrays sets all or some items of an array to a given a value. Learn more.

• Array find() and findIndex(): The find() and findIndex() methods of arrays and typed arrays search an array for the first item that satisfies a test function. Learn more.

• Array.from(): The Array.from() and typed array .from() static methods copy items from an iterable or array-like object to make a new array. Learn more.

• Array includes(): The includes() method of arrays and typed arrays returns whether a given value appears in the array. Learn more.

• Array.of(): The Array.of() and typed array .of() static methods create new arrays from the values of any number of arguments. Learn more.

• background-repeat: The background-repeat CSS property sets how a background image is tiled. Learn more.

• filter: The filter CSS property applies one or more graphic effects to an element. You can use filter functions, such as blur() and drop-shadow(), alone or combined to produce different effects. Learn more.

• @font-face: The @font-face CSS at-rule creates a custom font-family value. The at-rule's descriptors set the font's name, source, and various display settings. Learn more.

• Generators: Generator functions (function*) create iterators that return multiple values, one after another, on-demand. Learn more.

• Proxy and Reflect: The Proxy and Reflect JavaScript built-ins intercept and define custom behavior for fundamental language operations (such as property lookup, assignment, enumeration, or function invocation). Learn more.

• String normalize(): The normalize() method of strings returns a Unicode normal form of a string as a new string. More than one code point sequence can represent the same characters. You can use the normalize() method to find canonically or compatibly equivalent strings. Learn more.

• @supports (compatibility prefix): The @supports (-webkit-transform-3d) CSS media query is a standardized compatibility alternative to @supports (transform-style). Learn more.

• Typed array iteration methods: Typed array iteration methods Learn more.

• Typed array iterators: Typed arrays are iterable with the for … of statement and enumerable with the methods entries(), keys(), and values(). Learn more.

Newly available on the web platform

Newly available

• Abortable fetch: If you construct a fetch request with an AbortSignal, you can cancel the request. Learn more.

• AbortController and AbortSignal: The AbortController and AbortSignal APIs allow you to cancel an ongoing operation, such as a fetch() request. Learn more.

• Intersection observer: The Intersection Observer API asynchronously observes changes in the intersection of a target element with an ancestor element or with a top-level document's viewport. Learn more.