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https://developer.mozilla.org/en-US/docs/Web/JavaScript JavaScript | MDN JavaScript (JS) is a lightweight interpreted (or just-in-time compiled) programming language with first-class functions. While it is most well-known as the... javascriptmdn https://developer.mozilla.org/en-US/docs/Web/HTML HTML: HyperText Markup Language | MDN HTML (HyperText Markup Language) is the most basic building block of the Web. It defines the meaning and structure of web content. Other technologies besides... hypertext markup languagehtmlmdn https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules JavaScript modules - JavaScript | MDN This guide gives you all you need to get started with JavaScript module syntax. javascript modulesmdn https://developer.mozilla.org/en-US/ MDN Web Docs The MDN Web Docs site provides information about Open Web technologies including HTML, CSS, and APIs for both Web sites and progressive web apps. mdnwebdocs https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API Canvas API - Web APIs | MDN canvas apiweb apismdn https://developer.mozilla.org/en-US/docs/Web/CSS CSS: Cascading Style Sheets | MDN Cascading Style Sheets (CSS) is a stylesheet language used to describe the presentation of a document written in HTML or XML (including XML dialects such as... cascading style sheetscssmdn https://developer.mozilla.org/en-US/docs/Web/API/WebGL_API WebGL: 2D and 3D graphics for the web - Web APIs | MDN WebGL (Web Graphics Library) is a JavaScript API for rendering high-performance interactive 3D and 2D graphics within any compatible web browser without the... for the webwebglgraphicsapismdn https://developer.mozilla.org/en-US/docs/Web/API/Web_Audio_API Web Audio API - Web APIs | MDN The Web Audio API provides a powerful and versatile system for controlling audio on the Web, allowing developers to choose audio sources, add effects to audio,... web audio apiapismdn https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Using_web_workers Using Web Workers - Web APIs | MDN Web Workers are a simple means for web content to run scripts in background threads. The worker thread can perform tasks without interfering with the user... web workersusingapismdn https://developer.mozilla.org/en-US/docs/Web/API/WebRTC_API WebRTC API - Web APIs | MDN WebRTC (Web Real-Time Communication) is a technology that enables Web applications and sites to capture and optionally stream audio and/or video media, as well... api webwebrtcapismdn https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/CSP Content Security Policy (CSP) - HTTP | MDN Content Security Policy (CSP) is a feature that helps to prevent or minimize the risk of certain types of security threats. It consists of a series of... content security policycsphttpmdn https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API Fetch API - Web APIs | MDN The Fetch API provides an interface for fetching resources (including across the network). It is a more powerful and flexible replacement for XMLHttpRequest. fetch apiweb apismdn https://developer.mozilla.org/en-US/docs/Web/API/View_Transition_API View Transition API - Web APIs | MDN The View Transition API provides a mechanism for easily creating animated transitions between different website and element views. This includes animating... api webviewtransitionapismdn https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise Promise - JavaScript | MDN The Promise object represents the eventual completion (or failure) of an asynchronous operation and its resulting value. promisejavascriptmdn https://developer.mozilla.org/en-US/docs/Web/SVG SVG: Scalable Vector Graphics | MDN Scalable Vector Graphics (SVG) is an XML-based markup language for describing two-dimensional based vector graphics. scalable vector graphicssvgmdn https://developer.mozilla.org/ja/ MDN Web Docs The MDN Web Docs site provides information about Open Web technologies including HTML, CSS, and APIs for both Web sites and progressive web apps. mdnwebdocs https://developer.mozilla.org/en-US/docs/Web/API/Request Request - Web APIs | MDN The Request interface of the Fetch API represents a resource request. web apisrequestmdn https://developer.mozilla.org/en-US/docs/Web/API/WebSockets_API WebSocket API (WebSockets) - Web APIs | MDN The WebSocket API makes it possible to open a two-way interactive communication session between the user's browser and a server. With this API, you can send... websocket apiwebsocketsapismdn https://developer.mozilla.org/en-US/docs/Glossary/HTML5 HTML5 - Glossary | MDN The term HTML5 is essentially a buzzword that refers to a set of modern web technologies. This includes the HTML Living Standard, along with JavaScript APIs to... glossarymdn https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map Map - JavaScript | MDN The Map object holds key-value pairs and remembers the original insertion order of the keys. Any value (both objects and primitive values) may be used as... mapjavascriptmdn https://developer.mozilla.org/en-US/docs/Web Web technology for developers | MDN The open Web presents incredible opportunities for developers. To take full advantage of these technologies, you need to know how to use them. Below you'll... web technologyfor developersmdn https://developer.mozilla.org/en-US/docs/Web/API/Web_Crypto_API Web Crypto API - Web APIs | MDN The Web Crypto API is an interface allowing a script to use cryptographic primitives in order to build systems using cryptography. web crypto apiapismdn https://developer.mozilla.org/en-US/docs/Web/API/Window/postMessage Window: postMessage() method - Web APIs | MDN The window.postMessage() method safely enables cross-origin communication between Window objects; e.g., between a page and a pop-up that it spawned, or between... web apiswindowpostmessagemethodmdn https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON JSON - JavaScript | MDN The JSON namespace object contains static methods for parsing values from and converting values to JavaScript Object Notation (JSON). jsonjavascriptmdn https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp RegExp - JavaScript | MDN The RegExp object is used for matching text with a pattern. regexpjavascriptmdn https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Temporal Temporal - JavaScript | MDN The Temporal object enables date and time management in various scenarios, including built-in time zone and calendar representation, wall-clock time... temporaljavascriptmdn https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/CORS Cross-Origin Resource Sharing (CORS) - HTTP | MDN 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... cross originresource sharingcorshttpmdn https://github.com/mdn MDN Web Docs · GitHub Data and tools related to MDN Web Docs (formerly Mozilla Developer Network, formerly Mozilla Developer Center...) - MDN Web Docs mdn web docsgithub https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API/Using_Fetch Using the Fetch API - Web APIs | MDN The Fetch API provides a JavaScript interface for making HTTP requests and processing the responses. fetch apiweb apisusingmdn https://developer.mozilla.org/en-US/docs/Web/API Web APIs | MDN When writing code for the Web, there are a large number of Web APIs available. Below is a list of all the APIs and interfaces (object types) that you may be... web apismdn https://developer.mozilla.org/en-US/docs/Web/Progressive_web_apps Progressive web apps | MDN A progressive web app (PWA) is an app that's built using web platform technologies, but that provides a user experience like that of a platform-specific app. progressive web appsmdn https://developer.mozilla.org/en-US/docs/Web/HTML/Reference/Elements/input/date input type="date" HTML attribute value - HTML | MDN type dateinputhtmlattributevalue https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/parse JSON.parse() - JavaScript | MDN The JSON.parse() static method parses a JSON string, constructing the JavaScript value or object described by the string. An optional reviver function can be... jsonparsejavascriptmdn https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/random Math.random() - JavaScript | MDN The Math.random() static method returns a floating-point, pseudo-random number that's greater than or equal to 0 and less than 1, with approximately uniform... mathrandomjavascriptmdn https://developer.mozilla.org/en-US/docs/Web/API/WebCodecs_API WebCodecs API - Web APIs | MDN The WebCodecs API enables web developers to encode and decode video and audio in the browser efficiently (using hardware acceleration) and with very low-level... api webwebcodecsapismdn https://developer.mozilla.org/en-US/observatory HTTP Header Security Test - HTTP Observatory | MDN Test your site’s HTTP headers, including CSP and HSTS, to find security problems and get actionable recommendations to make your website more secure. Test... http headersecurity testobservatorymdn https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Template_literals Template literals (Template strings) - JavaScript | MDN Template literals are literals delimited with backtick (`) characters, allowing for multi-line strings, string interpolation with embedded expressions, and... template literalsstringsjavascriptmdn https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Selectors/:scope :scope CSS pseudo-class - CSS | MDN The :scope CSS pseudo-class represents elements that are a reference point, or scope, for selectors to match against. scopecsspseudoclassmdn https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/sort Array.prototype.sort() - JavaScript | MDN The sort() method of Array instances sorts the elements of an array in place and returns the reference to the same array, now sorted. The default sort order is... arrayprototypesortjavascriptmdn https://developer.mozilla.org/en-US/docs/Web/API/Window/fetch Window: fetch() method - Web APIs | MDN The fetch() method of the Window interface starts the process of fetching a resource from the network, returning a promise that is fulfilled once the response... web apiswindowfetchmethodmdn https://developer.mozilla.org/en-US/docs/Web/API/Geolocation_API Geolocation API - Web APIs | MDN The Geolocation API allows the user to provide their location to web applications if they so desire. For privacy reasons, the user is asked for permission to... geolocation apiweb apismdn https://developer.mozilla.org/en-US/docs/Web/API/Web_Bluetooth_API Web Bluetooth API - Web APIs | MDN The Web Bluetooth API provides the ability to connect and interact with Bluetooth Low Energy peripherals. web bluetoothapi apismdn https://github.com/mdn/browser-compat-data GitHub - mdn/browser-compat-data: Browser compatibility data for Web technologies as displayed on... Browser compatibility data for Web technologies as displayed on MDN - mdn/browser-compat-data https://developer.mozilla.org/en-US/docs/Web/API/WebGLRenderingContext/stencilFunc WebGLRenderingContext: stencilFunc() method - Web APIs | MDN The WebGLRenderingContext.stencilFunc() method of the WebGL API sets the front and back function and reference value for stencil testing. web apismethodmdn https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array Array - JavaScript | MDN The Array object, as with arrays in other programming languages, enables storing a collection of multiple items under a single variable name, and has members... arrayjavascriptmdn https://developer.mozilla.org/en-US/docs/Web/API/IndexedDB_API IndexedDB API - Web APIs | MDN IndexedDB is a low-level API for client-side storage of significant amounts of structured data, including files/blobs. This API uses indexes to enable... api webindexeddbapismdn https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/import import - JavaScript | MDN The static import declaration is used to import read-only live bindings which are exported by another module. The imported bindings are called live bindings... importjavascriptmdn https://developer.mozilla.org/en-US/docs/Web/API/Headers/Headers Headers: Headers() constructor - Web APIs | MDN The Headers() constructor creates a new Headers object. constructor webheadersapismdn https://developer.mozilla.org/en-US/docs/Web/API/File File - Web APIs | MDN The File interface provides information about files and allows JavaScript in a web page to access their content. web apisfilemdn https://github.com/mdn/content GitHub - mdn/content: The official source for MDN Web Docs content. Home to over 14,000 pages of... The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more. - mdn/content https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Values/named-color named-color CSS type - CSS | MDN namedcolorcsstypemdn https://developer.mozilla.org/en-US/docs/Web/API/EventTarget EventTarget - Web APIs | MDN The EventTarget interface is implemented by objects that can receive events and may have listeners for them. In other words, any target of events implements... web apiseventtargetmdn https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Operator_precedence Operator precedence - JavaScript | MDN Operator precedence determines how operators are parsed concerning each other. Operators with higher precedence become the operands of operators with lower... operator precedencejavascriptmdn https://developer.mozilla.org/en-US/docs/Web/API/PaymentRequest PaymentRequest - Web APIs | MDN The Payment Request API's PaymentRequest interface is the primary access point into the API, and lets web content and apps accept payments from the end user on... web apismdn https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/ETag ETag header - HTTP | MDN The HTTP ETag (entity tag) response header is an identifier for a specific version of a resource. It lets caches be more efficient and save bandwidth, as a web... etagheaderhttpmdn https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/Arrow_functions Arrow function expressions - JavaScript | MDN An arrow function expression is a compact alternative to a traditional function expression, with some semantic differences and deliberate limitations in usage: arrow functionexpressionsjavascriptmdn https://mastodon.social/@mdn MDN Web Docs (@mdn@mastodon.social) - Mastodon 567 Posts, 3 Following, 2.88K Followers · The official MDN Web Docs account. We deliver the best web docs around. Visit → https://mdn.dev Contribute →... mdn web docsmastodonsocial https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/402 402 Payment Required - HTTP | MDN The HTTP 402 Payment Required client error response status code is a nonstandard response status code reserved for future use. paymentrequiredhttpmdn https://developer.mozilla.org/en-US/docs/Web/API/Node Node - Web APIs | MDN The DOM Node interface is an abstract base class upon which many other DOM API objects are based, thus letting those object types be used similarly and often... web apisnodemdn https://developer.mozilla.org/en-US/docs/Glossary/Inline-level_content Inline-level content - Glossary | MDN In CSS, content that participates in inline layout is called inline-level content. Most text sequences, replaced elements, and generated content are... inlinelevelcontentglossarymdn https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Access-Control-Allow-Origin Access-Control-Allow-Origin header - HTTP | MDN The HTTP Access-Control-Allow-Origin response header indicates whether the response can be shared with requesting code from the given origin. access controlalloworiginheaderhttp https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/304 304 Not Modified - HTTP | MDN The HTTP 304 Not Modified redirection response status code indicates that there is no need to retransmit the requested resources. modifiedhttpmdn https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Using_promises Using promises - JavaScript | MDN A Promise is an object representing the eventual completion or failure of an asynchronous operation. Since most people are consumers of already-created... using promisesjavascriptmdn https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map Array.prototype.map() - JavaScript | MDN The map() method of Array instances creates a new array populated with the results of calling a provided function on every element in the calling array. arrayprototypemapjavascriptmdn https://developer.mozilla.org/en-US/docs/MDN/Writing_guidelines/Attrib_copyright_license Attribution and copyright licensing - MDN Web Docs | MDN MDN Web Docs content is available free of charge and is available under various open-source licenses. copyright licensingattributionmdnwebdocs https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/301 301 Moved Permanently - HTTP | MDN The HTTP 301 Moved Permanently redirection response status code indicates that the requested resource has been permanently moved to the URL in the Location... movedpermanentlyhttpmdn https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Sec-Fetch-Site Sec-Fetch-Site header - HTTP | MDN The HTTP Sec-Fetch-Site fetch metadata request header indicates the relationship between a request initiator's origin and the origin of the requested resource. site headersecfetchhttpmdn https://developer.mozilla.org/en-US/docs/Web/API/Gamepad_API/Using_the_Gamepad_API Using the Gamepad API - Web APIs | MDN gamepad apiweb apisusingmdn https://developer.mozilla.org/en-US/docs/Glossary/WebRTC WebRTC - Glossary | MDN WebRTC (Web Real-Time Communication) is an API that can be used by video-chat, voice-calling, and P2P-file-sharing Web apps. webrtcglossarymdn https://developer.mozilla.org/en-US/docs/Web/API/CSS_Custom_Highlight_API CSS Custom Highlight API - Web APIs | MDN The CSS Custom Highlight API provides a mechanism for styling arbitrary text ranges on a document by using JavaScript to create the ranges, and CSS to style... api webcsscustomhighlightapis https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/typeof typeof - JavaScript | MDN The typeof operator returns a string indicating the type of the operand's value. typeofjavascriptmdn https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/endsWith String.prototype.endsWith() - JavaScript | MDN The endsWith() method of String values determines whether a string ends with the characters of this string, returning true or false as appropriate. stringprototypeendswithjavascriptmdn https://developer.mozilla.org/en-US/blog/ MDN Blog The MDN Web Docs site provides information about Open Web technologies including HTML, CSS, and APIs for both Web sites and progressive web apps. mdnblog https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Reference/Attributes/aria-label ARIA: aria-label attribute - ARIA | MDN The aria-label attribute defines a string value that can be used to name an element, as long as the element's role does not prohibit naming. arialabelattributemdn https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/dataset HTMLElement: dataset property - Web APIs | MDN The dataset read-only property of the HTMLElement interface provides read/write access to custom data attributes (data-*) on elements. It exposes a map of... web apisdatasetpropertymdn https://developer.mozilla.org/en-US/docs/Glossary/MVC MVC - Glossary | MDN MVC (Model-View-Controller) is a pattern in software design commonly used to implement user interfaces, data, and controlling logic. It emphasizes a separation... mvcglossarymdn https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/mix-blend-mode mix-blend-mode CSS property - CSS | MDN The mix-blend-mode CSS property sets how an element's content should blend with the content of the element's parent and the element's background. blend modemixcsspropertymdn https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date Date - JavaScript | MDN JavaScript Date objects represent a single moment in time in a platform-independent format. Date objects encapsulate an integral number that represents... datejavascriptmdn https://developer.mozilla.org/en-US/docs/Web/API/Web_Animations_API/Using_the_Web_Animations_API Using the Web Animations API - Web APIs | MDN The Web Animations API lets us construct animations and control their playback with JavaScript. This article will start you off in the right direction with fun... web animations apiusingapismdn https://developer.mozilla.org/en-US/docs/Glossary/Global_object Global object - Glossary | MDN The global object in JavaScript is an object which represents the global scope. globalobjectglossarymdn https://developer.mozilla.org/en-US/docs/Web/Media/Guides/Formats/Image_types Image file type and format guide - Media | MDN In this guide, we'll cover the image file types generally supported by web browsers, and provide insights that will help you select the most appropriate... image fileformat guidetypemediamdn https://developer.mozilla.org/en-US/docs/Web/API/Navigator/storage Navigator: storage property - Web APIs | MDN The Navigator.storage read-only property returns the singleton StorageManager object used to access the overall storage capabilities of the browser for the... storage propertyweb apisnavigatormdn https://developer.mozilla.org/en-US/docs/Web/API/NavigatorUAData NavigatorUAData - Web APIs | MDN The NavigatorUAData interface of the User-Agent Client Hints API returns information about the browser and operating system of a user. web apismdn https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Cross-Origin-Opener-Policy Cross-Origin-Opener-Policy (COOP) header - HTTP | MDN The HTTP Cross-Origin-Opener-Policy (COOP) response header allows a website to control whether a new top-level document, opened using Window.open() or by... cross originopenerpolicycoopheader https://developer.mozilla.org/en-US/docs/Web/API/Notification/Notification Notification: Notification() constructor - Web APIs | MDN The Notification() constructor creates a new Notification object instance, which represents a user notification. constructor webnotificationapismdn https://developer.mozilla.org/en-US/docs/Web/API/History_API History API - Web APIs | MDN The History API provides access to the browser's session history (not to be confused with WebExtensions history) through the history global object. It exposes... history apiweb apismdn https://developer.mozilla.org/en-US/docs/Web/API/Intersection_Observer_API Intersection Observer API - Web APIs | MDN The Intersection Observer API provides a way to asynchronously observe changes in the intersection of a target element with an ancestor element or with a... intersection observer apiweb apismdn https://developer.mozilla.org/en-US/docs/Web/API/Navigator/share Navigator: share() method - Web APIs | MDN The share() method of the Navigator interface invokes the native sharing mechanism of the device to share data such as text, URLs, or files. The available... web apisnavigatorsharemethodmdn https://developer.mozilla.org/en-US/docs/Web/API/Document/cookie Document: cookie property - Web APIs | MDN The Document property cookie lets you read and write cookies associated with the document. It serves as a getter and setter for the actual values of the... web apisdocumentcookiepropertymdn https://developer.mozilla.org/en-US/docs/Web/API/Service_Worker_API Service Worker API - Web APIs | MDN Service workers essentially act as proxy servers that sit between web applications, the browser, and the network (when available). They are intended, among... service workerapi webapismdn https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/Cookies Using HTTP cookies - HTTP | MDN A cookie (also known as a web cookie or browser cookie) is a small piece of data a server sends to a user's web browser. The browser may store cookies, create... http cookiesusingmdn https://developer.mozilla.org/en-US/docs/Web/URI/Reference/Fragment/Text_fragments Text fragments - URIs | MDN Text fragments link directly to specific text in a web page, without requiring the page author to add an ID. They use a special syntax in the URL fragment.... textfragmentsurismdn https://developer.mozilla.org/en-US/docs/Web/API/Location/href Location: href property - Web APIs | MDN The href property of the Location interface is a stringifier that returns a string containing the whole URL, and allows the href to be updated. web apislocationhrefpropertymdn https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Cross-Origin-Embedder-Policy Cross-Origin-Embedder-Policy (COEP) header - HTTP | MDN The HTTP Cross-Origin-Embedder-Policy (COEP) response header configures the current document's policy for loading and embedding cross-origin resources that are... cross originembedderpolicycoepheader https://developer.mozilla.org/en-US/docs/Learn_web_development/Core/Scripting Dynamic scripting with JavaScript - Learn web development | MDN JavaScript is a huge topic, with so many different features, styles, and techniques to learn, and so many APIs and tools built on top of it. This module... learn web developmentdynamicscriptingjavascriptmdn https://developer.mozilla.org/en-US/docs/Web/Security Security on the web | MDN Websites contain several different types of information. Some of it is non-sensitive, for example the copy shown on the public pages. Some of it is sensitive,... on the websecuritymdn https://developer.mozilla.org/en-US/docs/Web/API/Element/moveBefore Element: moveBefore() method - Web APIs | MDN The moveBefore() method of the Element interface moves a given Node inside the invoking node as a direct child, before a given reference node. web apiselementmethodmdn https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/arc CanvasRenderingContext2D: arc() method - Web APIs | MDN The CanvasRenderingContext2D.arc() method of the Canvas 2D API adds a circular arc to the current sub-path. web apisarcmethodmdn https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Access-Control-Max-Age Access-Control-Max-Age header - HTTP | MDN The HTTP Access-Control-Max-Age response header indicates how long the results of a preflight request (that is, the information contained in the... access controlmaxageheaderhttp https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/corner-shape corner-shape CSS property - CSS | MDN The corner-shape shorthand CSS property specifies the shape of a box's corners, within the area specified by its border-radius property value. cornershapecsspropertymdn