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Effective URL: https://developer.mozilla.org/en-US/
Submission: On December 05 via api from JP — Scanned from JP
Effective URL: https://developer.mozilla.org/en-US/
Submission: On December 05 via api from JP — Scanned from JP
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Text Content
* Skip to main content * Skip to search MDN Plus now available in your country! Support MDN and make it your own. Learn more ✨ MDN Web DocsOpen main menu * ReferencesReferences * Overview / Web Technology Web technology reference for developers * HTML Structure of content on the web * CSS Code used to describe document style * JavaScript General-purpose scripting language * HTTP Protocol for transmitting web resources * Web APIs Interfaces for building web applications * Web Extensions Developing extensions for web browsers * Web Technology Web technology reference for developers * GuidesGuides * Overview / MDN Learning Area Learn web development * MDN Learning Area Learn web development * HTML Learn to structure web content with HTML * CSS Learn to style content using CSS * JavaScript Learn to run scripts in the browser * Accessibility Learn to make the web accessible to all * MDN PlusMDN Plus * Overview A customized MDN experience * Documentation Learn how to use MDN Plus * FAQ Frequently asked questions about MDN Plus Search MDNClear search inputSearch Theme * Already a subscriber? * Get MDN Plus RESOURCES FOR DEVELOPERS, BY DEVELOPERS Documenting web technologies, including CSS, HTML, and JavaScript, since 2005. Search MDNClear search inputSearch Mandala //////////// //////////// //////////// //////////// //////////// //////////// //////////// ++++++ ++++++ ++++++ ++++++ ++++++ ++++++ ++++++{{{{ }}}} {{{{ }}}} {{{{ }}}} {{{{ }}}} {{{{ }}}} {{{{ }}}} ../../ ../../ ../../ ../../ ../../ ../../ ../../<></><></><></><></><></><></><></><></><></><></><></><></><></><></><></><></> FEATURED ARTICLES CSS INTRODUCING THE CSS CASCADE The cascade is an algorithm that defines how user agents combine property values originating from different sources. The cascade defines the origin and layer that takes precedence when declarations in more than one origin or cascade layer set a value for a property on an element. HTML <DIALOG>: THE DIALOG ELEMENT The <dialog> HTML element represents a dialog box or other interactive component, such as a dismissible alert, inspector, or subwindow. JavaScript — Dynamic client-side scripting ASYNCHRONOUS JAVASCRIPT In this module, we take a look at asynchronous JavaScript, why it is important, and how it can be used to effectively handle potential blocking operations, such as fetching resources from a server. Web APIs CANVAS TUTORIAL This tutorial describes how to use the <canvas> element to draw 2D graphics, starting with the basics. The examples provided should give you some clear ideas about what you can do with canvas, and will provide code snippets that may get you started in building your own content. LATEST NEWS * Revamp of MDN Web Docs Contribution Docshacks.mozilla.org a month ago * The 100% Markdown Expeditionhacks.mozilla.org 3 months ago * Merging two GitHub repositories without losing commit historyhacks.mozilla.org 3 months ago RECENT CONTRIBUTIONS * Add omitting options argument sectionmdn/content 15 hours ago * chore(ru): remove `{{note}}` macromdn/translated-content 16 hours ago * Made sentence easy to understandmdn/content 18 hours ago * Fix grammar.mdn/content 19 hours ago * Remove underscores from linksmdn/content 19 hours ago * Accessibility notes updatesmdn/content 19 hours ago * fix: Markdownlint literal nbspmdn/translated-content 21 hours ago * chore(ru): markdownlint auto-cleanupmdn/translated-content a day ago * fix: enable MD023mdn/translated-content a day ago * chore(ru): fix markdown syntax in "Element.id" articlemdn/translated-content a day ago CONTRIBUTOR SPOTLIGHT Yuji > MDN Web Docs has the most up-to-date and accurate information and the content > is presented in an easy-to-understand manner. I also like that it's available > in many languages (very important!). Get involved → Mandala //////////// //////////// //////////// //////////// //////////// //////////// //////////// ++++++ ++++++ ++++++ ++++++ ++++++ ++++++ ++++++{{{{ }}}} {{{{ }}}} {{{{ }}}} {{{{ }}}} {{{{ }}}} {{{{ }}}} ../../ ../../ ../../ ../../ ../../ ../../ ../../<></><></><></><></><></><></><></><></><></><></><></><></><></><></><></><></> MDN logo Your blueprint for a better internet. * MDN on Twitter * MDN on GitHub MDN * About * Hacks Blog * Careers SUPPORT * Product help * Report an issue OUR COMMUNITIES * MDN Community * MDN Forum * MDN Chat DEVELOPERS * Web Technologies * Learn Web Development * MDN Plus Mozilla logo * Website Privacy Notice * Cookies * Legal * Community Participation Guidelines Visit Mozilla Corporation’s not-for-profit parent, the Mozilla Foundation. Portions of this content are ©1998–2022 by individual mozilla.org contributors. Content available under a Creative Commons license.