BASELINE NowYouCanUse.com
Web Platform Baseline Status Breakdown Total Features: 1219
Widely Available 655 (53.73%)
Newly Available 120 (9.84%)
Limited 444 (36.43%)
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Status: All Widely Available
Categories: All Typed arrays (8) Arrays (6) JavaScript (4) WebGL extensions (4) Background (1)
CSS (1) Explicit defaults (1) Fonts (1) HTML elements (1) Iterators (1) Media queries (1) Parsing and serialization (1) Security (1) Strings (1) Typographic font features (1)
Years: All 2024 2022 2021 2020 2017 2016 2015
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Showing 4 of 4 features

2016

4 features
• September 2016

Let and const

JavaScript
Widely Available

The let and const declarations define block-scoped variables.

Chrome 49
Firefox 44
Safari 10
Edge 14
Baseline Date: Sep 20, 2016

Generators

JavaScript
Widely Available

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

Chrome 39
Firefox 26
Safari 10
Edge 13
Baseline Date: Sep 20, 2016

Proxy and Reflect

JavaScript
Widely Available

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).

Chrome 49
Firefox 18
Safari 10
Edge 12
Baseline Date: Sep 20, 2016
• March 2016

Classes

JavaScript
Widely Available

Classes are an object-oriented syntax for JavaScript prototypes.

Chrome 42
Firefox 45
Safari 9
Edge 13
Baseline Date: Mar 8, 2016