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modernizr

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Modernizr is a JavaScript library that detects HTML5 and CSS3 features in the user’s browser.

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/*! { "name": "ES6 Collections", "property": "es6collections", "notes": [{ "name": "unofficial ECMAScript 6 draft specification", "href": "https://people.mozilla.org/~jorendorff/es6-draft.html" }], "polyfills": ["es6shim", "weakmap"], "authors": ["Ron Waldon (@jokeyrhyme)"], "warnings": ["ECMAScript 6 is still a only a draft, so this detect may not match the final specification or implementations."], "tags": ["es6"] } !*/ /* DOC Check if browser implements ECMAScript 6 Map, Set, WeakMap and WeakSet */ define(['Modernizr'], function(Modernizr) { Modernizr.addTest('es6collections', !!( window.Map && window.Set && window.WeakMap && window.WeakSet )); });