Arrow function expressions - JavaScript | MDN
This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2016. Learn more See full compatibility Report feedback An arrow function expression is a compact alternative to a traditional function expression, with some semantic differences and deliberate limitations in usage: Arrow functions don't have their own bindings t
Promise - JavaScript | MDN
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015. * Some parts of this feature may have varying levels of support. Learn more See full compatibility Report feedback The Promise object represents the eventual completion (or failure) of an asynchronous operation and its resulting value. To learn about the way pro
Object initializer - JavaScript | MDN
o = { a: "foo", b: 42, c: {}, 1: "number literal property", "foo:bar": "string literal property", shorthandProperty, method(parameters) { // … }, get property() {}, set property(value) {}, [expression]: "computed property", __proto__: prototype, ...spreadProperty, }; Description An object initializer is an expression that describes the initialization of an Object. Objects consist of properties, wh
Introduction to Service Worker: How to use Service Worker - HTML5 Rocks
Service workers essentially act as proxy servers that sit between web applications, the browser, and the network (when available). They are intended, among other things, to enable the creation of effective offline experiences, intercept network requests, and take appropriate action based on whether the network is available, and update assets residing on the server. They will also allow access to p
ECMAScript 2016 to ES.Next support in Mozilla - Archive of obsolete content | MDN
ECMAScript Next refers to new features of the ECMA-262 standard (commonly referred to as JavaScript) introduced after ECMAScript 2015. New versions of ECMAScript specifications are released yearly. So far, ES2016, ES2017, and ES2018 have been released. This year, the ES2019 specification will be released and ES2020 is the current ECMAScript draft specification. You can see the latest proposals on
Array.prototype.filter() - JavaScript | MDN
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015. Learn more See full compatibility Report feedback The filter() method of Array instances creates a shallow copy of a portion of a given array, filtered down to just the elements from the given array that pass the test implemented by the provided function.
Using the Fetch API - Web APIs | MDN
The Fetch API provides a JavaScript interface for making HTTP requests and processing the responses. Fetch is the modern replacement for XMLHttpRequest: unlike XMLHttpRequest, which uses callbacks, Fetch is promise-based and is integrated with features of the modern web such as service workers and Cross-Origin Resource Sharing (CORS). With the Fetch API, you make a request by calling fetch(), whic
Cross-Origin Resource Sharing (CORS) - HTTP | MDN
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015. Learn more See full compatibility Report feedback Cross-Origin Resource Sharing (CORS) is an HTTP-header based mechanism that allows a server to indicate any origins (domain, scheme, or port) other than its own from which a browser should permit loading resource
Event: target プロパティ - Web API | MDN
// リストの作成 const ul = document.createElement("ul"); document.body.appendChild(ul); const li1 = document.createElement("li"); const li2 = document.createElement("li"); ul.appendChild(li1); ul.appendChild(li2); function hide(evt) { // evt.target はクリックされた <li> 要素を参照しています。 // これはこのコンテキストで親である <ul> を参照している evt.currentTarget とは異なります。 evt.target.style.visibility = "hidden"; } // リストにリスナーを接続します // <li> がクリ
Object.assign() - JavaScript | MDN
This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2015. Learn more See full compatibility Report feedback The Object.assign() static method copies all enumerable own properties from one or more source objects to a target object. It returns the modified target object.
Function.prototype.bind() - JavaScript | MDN
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015. Learn more See full compatibility Report feedback The bind() method of Function instances creates a new function that, when called, calls this function with its this keyword set to the provided value, and a given sequence of arguments preceding any provided when
Request - Web APIs | MDN
This feature is well established and works across many devices and browser versions. It’s been available across browsers since March 2017. * Some parts of this feature may have varying levels of support. Learn more See full compatibility Report feedback The Request interface of the Fetch API represents a resource request. You can create a new Request object using the Request() constructor, but you
Use data attributes - HTML | MDN
HTML is designed with extensibility in mind for data that should be associated with a particular element but need not have any defined meaning. data-* attributes allow us to store extra information on standard, semantic HTML elements without other hacks such as non-standard attributes, or extra properties on DOM. HTML syntax The syntax is simple. Any attribute on any element whose attribute name s
オリジン間リソース共有 (CORS) - HTTP | MDN
This feature is well established and works across many devices and browser versions. It’s been available across browsers since 2015年7月. Learn more See full compatibility Report feedback オリジン間リソース共有 (Cross-Origin Resource Sharing, CORS) は、 HTTP ヘッダーベースの仕組みを使用して、あるオリジンで動作しているウェブアプリケーションに、異なるオリジンにある選択されたリソースへのアクセス権を与えるようブラウザーに指示するための仕組みです。ウェブアプリケーションは、自分とは異なるオリジン (ドメイン、プロトコル、ポート番号) にあるリソースをリクエストするとき、
JavaScript language overview - JavaScript | MDN
JavaScript is a multi-paradigm, dynamic language with types and operators, standard built-in objects, and methods. Its syntax is based on the Java and C languages — many structures from those languages apply to JavaScript as well. JavaScript supports object-oriented programming with object prototypes and classes. It also supports functional programming since functions are first-class objects that
Getting started with app development - App Center | MDN
Web apps are apps built using standard Web technologies. They work in any modern Web browser, and can be developed using your favorite tools. Some characteristics that distinguish Web apps from websites: Apps are installed by a user, they are self-contained and don't always require the chrome of a browser window, and they can be built to run offline. Gmail, Twitter, and Etherpad are Web apps. The
Gaia 概論 - Archive of obsolete content | MDN
ロック画面はネットワークキャリアや、現在の時刻と日付、やユーザが電話のロック解除や直接カメラ撮影を起動するスライドバーを表示しています。ユーザがパスコードロックをセットしている場合、ロック画面はパスコード入力インターフェイスも表示します。 いくつかの端末で、デフォルトでロック画面が有効で、その場合端末を解除するデフォルト PIN は "0000" です。時間とともに、この機能は具体化されていくことでしょう。 Gaia のデフォルトインターフェイスは、ここで見られるとおり、代表的なスマートフォンで見られるものと似ています。 この画像は、もちろん、オペレーティングシステムとプレースホルダアイコン（といくつかのテストアプリケーション）のプレリリースバージョンです。一番上のステータスバーは操作しているスマートフォンのネットワーク（ネットワークのないデバイスに対しては"No SIM card"）、ネ
B2G OS - Archive of obsolete content | MDN
B2G OS は、オープンウェブのための完全にスタンドアロンなオペレーティングシステムです。これは、Mozilla コミュニティにより開発されたオープンソースプロジェクトであり、Firefox OS の基盤を形成します。 B2G OS は、コミュニティが保守するスマートフォンやタブレット、スマート TV、コネクテッドデバイス向けのオープンソースのオペレーティングシステムです。このプロジェクトは 2011 年に開始され、Linux カーネルと Gecko レンダリングエンジンをベースとしています。ユーザーインターフェイス全体が Web 技術 (HTML や CSS、JavaScript) で構築され、Web アプリケーションとして起動、使用することができます。Mozilla が商用 Firefox OS スマートフォンプログラムを終了したため、Firefox OS プロジェクトのスマートフォ
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Strict-Transport-Security header - HTTP | MDN
margin-bottom - CSS | MDN