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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 for web github mdn browser compat 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. promise javascript mdn https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Releases/150 Firefox 150 release notes for developers (Stable) - Mozilla | MDN This article provides information about the changes in Firefox 150 that affect developers. Firefox 150 was released on April 21, 2026. firefox 150 release notes for developers stable mozilla 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 modules mdn https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/BigInt BigInt - JavaScript | MDN BigInt values represent integer values which are too high or too low to be represented by the number primitive. bigint javascript mdn 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 language html mdn https://developer.mozilla.org/en-US/docs/Web/API/HTMLFormElement/submit_event HTMLFormElement: submit event - Web APIs | MDN submit event web apis htmlformelement mdn https://survey.alchemer.com/s3/7634825/MDN-baseline-feedback?page=%2Fen-US%2Fdocs%2FWeb%2FCSS%2FReference%2FProperties%2Fborder-image-repeat&level=high MDN baseline feedback MDN baseline feedback. mdn baseline feedback 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 docs github https://survey.alchemer.com/s3/7634825/MDN-baseline-feedback?page=%2Fen-US%2Fdocs%2FWeb%2FCSS%2FReference%2FProperties%2Fborder-radius&level=high MDN baseline feedback MDN baseline feedback. mdn baseline feedback https://mastodon.social/@mdn MDN Web Docs (@mdn@mastodon.social) - Mastodon 520 Posts, 6 Following, 2.76K Followers · The official MDN Web Docs account. We deliver the best web docs around. Visit → https://mdn.dev Contribute →... mdn web docs mastodon social https://developer.mozilla.org/en-US/docs/WebAssembly WebAssembly | MDN WebAssembly is a type of code that can be run in modern web browsers. It is a low-level assembly-like language with a compact binary format that runs with... webassembly mdn https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Selectors/::spelling-error ::spelling-error CSS pseudo-element - CSS | MDN The ::spelling-error CSS pseudo-element represents a text segment which the user agent has flagged as incorrectly spelled. spelling error css pseudo element https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Selectors/:state :state() CSS pseudo-class - CSS | MDN The :state() CSS pseudo-class matches custom elements that have the specified custom state. state css pseudo class mdn https://survey.alchemer.com/s3/7634825/MDN-baseline-feedback?page=%2Fen-US%2Fdocs%2FWeb%2FCSS%2FReference%2FProperties%2Fborder-image-outset&level=high MDN baseline feedback MDN baseline feedback. mdn baseline feedback 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 graphics svg mdn https://developer.mozilla.org/en-US/docs/Web/API/FileList FileList - Web APIs | MDN web apis filelist mdn https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/$1 Page not found | MDN The MDN Web Docs site provides information about Open Web technologies including HTML, CSS, and APIs for both Web sites and progressive web apps. page not found mdn 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 bluetooth api apis mdn https://survey.alchemer.com/s3/7634825/MDN-baseline-feedback?page=%2Fen-US%2Fdocs%2FWeb%2FCSS%2FReference%2FProperties%2Fborder-image-width&level=high MDN baseline feedback MDN baseline feedback. mdn baseline feedback https://developer.mozilla.org/en-US/docs/Web/CSS/Guides/Scroll-driven_animations CSS scroll-driven animations - CSS | MDN The CSS scroll-driven animations module provides functionality that builds on the CSS animations module and Web Animations API. It allows you to animate... css scroll driven animations mdn 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 apis file mdn 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 api apis mdn https://developer.mozilla.org/en-US/docs/Web/API/Server-sent_events/Using_server-sent_events Using server-sent events - Web APIs | MDN Developing a web application that uses server-sent events is straightforward. You'll need a bit of code on the server to stream events to the front-end, but... web apis using server sent events Sponsored https://www.flirtbate.com/login Flirtbate: #1 Adult Chat & Live Sex Cam Platform Join Flirtbate, the #1 adult chat platform for live sex video call experience. Connect with sexy models, enjoy real-time interactions, and explore private... https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Selectors/::grammar-error ::grammar-error CSS pseudo-element - CSS | MDN The ::grammar-error CSS pseudo-element represents a text segment which the user agent has flagged as grammatically incorrect. grammar error css pseudo element https://survey.alchemer.com/s3/7634825/MDN-baseline-feedback?page=%2Fen-US%2Fdocs%2FWeb%2FCSS%2FReference%2FProperties%2Fborder-image-slice&level=high MDN baseline feedback MDN baseline feedback. mdn baseline feedback Sponsored https://sinparty.com/ SinParty | Freemium Adult Live Cams & Private Sex Shows Explore Live Adult Cams on SinParty. ❤️ 1000+ Real Models Streaming Naked. No Signup. Free to Watch. Start Watching Now! https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/async_function async function - JavaScript | MDN The async function declaration creates a binding of a new async function to a given name. The await keyword is permitted within the function body, enabling... async function javascript mdn https://developer.mozilla.org/en-US/docs/Web/CSS/Guides/Pseudo-elements CSS pseudo-elements - CSS | MDN The CSS pseudo-element module defines abstract elements that are not directly present in the document tree. These abstract elements, called pseudo-elements,... pseudo elements css mdn https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/hyphens hyphens CSS property - CSS | MDN The hyphens CSS property specifies how words should be hyphenated when text wraps across multiple lines. It can prevent hyphenation entirely, hyphenate at... hyphens css property mdn https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/At-rules/@media @media CSS at-rule - CSS | MDN The @media CSS at-rule can be used to apply part of a style sheet based on the result of one or more media queries. With it, you specify a media query and a... media css rule mdn https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/border-block-end-color border-block-end-color CSS property - CSS | MDN The border-block-end-color CSS property defines the color of the logical block-end border of an element, which maps to a physical border color depending on the... border block end color css https://mdn.co.jp/product/charming_item/7887 壁一面が推し色に！多彩な光で彩るスマート間接照明、手で曲げるだけで思いのままの形になる「SwitchBot RGBICワイヤーネオンライト」｜デザインを深掘り MdN mdn https://developer.mozilla.org/en-US/docs/Learn_web_development Learn web development | MDN Welcome to MDN Learning Web Development (also known as Learn). This resource provides a structured set of tutorials teaching the essential skills and practices... learn web development mdn https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/transition-property transition-property CSS property - CSS | MDN The transition-property CSS property sets the CSS properties to which a transition effect should be applied. transition property css mdn https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/vector-effect vector-effect CSS property - CSS | MDN The vector-effect CSS property suppresses specific transformation effects in SVG, thus permitting effects like a road on a map staying the same width no matter... vector effect css property mdn https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Selectors/:-moz-submit-invalid :-moz-submit-invalid CSS pseudo-class - CSS | MDN moz submit invalid css pseudo https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/container-name container-name CSS property - CSS | MDN The container-name CSS property specifies a list of query container names used by the @container at-rule in a container query. A container query will apply... container name css property mdn https://developer.mozilla.org/en-US/docs/Web/API/ByteLengthQueuingStrategy ByteLengthQueuingStrategy - Web APIs | MDN The ByteLengthQueuingStrategy interface of the Streams API provides a built-in byte length queuing strategy that can be used when constructing streams. web apis bytelengthqueuingstrategy mdn https://developer.mozilla.org/en-US/docs/Web/HTML/Reference/Elements/script/type/importmap script type="importmap" HTML attribute value - HTML | MDN script type importmap html attribute https://developer.mozilla.org/en-US/docs/Web/CSS/How_to/Layout_cookbook/Column_layouts Column layouts - CSS | MDN You will often need to create a layout which has a number of columns, and CSS provides several ways to do this. Whether you use Multi-column, Flexbox, or Grid... column layouts css mdn https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/background-clip background-clip CSS property - CSS | MDN The background-clip CSS property sets whether an element's background extends underneath its border box, padding box, or content box. background clip css property mdn https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Values/content-distribution content-distribution CSS type - CSS | MDN content distribution css type mdn https://developer.mozilla.org/en-US/docs/Web/API/Headers Headers - Web APIs | MDN The Headers interface of the Fetch API allows you to perform various actions on HTTP request and response headers. These actions include retrieving, setting,... web apis headers mdn https://developer.mozilla.org/en-US/docs/Glossary Glossary of web terms | MDN Web technologies use many types of jargon, acronyms, and abbreviations in documentation, code, and other contexts. This glossary provides definitions of words... web terms glossary mdn https://developer.mozilla.org/en-US/docs/Web/HTML/Reference/Elements/select select HTML select element - HTML | MDN select html element mdn https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/border-block-end-width border-block-end-width CSS property - CSS | MDN The border-block-end-width CSS property defines the width of the logical block-end border of an element, which maps to a physical border width depending on the... border block end width css https://mdn.co.jp/news/7947 モトヤ、下手だけど達筆という絶妙なバランスを追求した手書き風フォント「モトヤタッピー」を発売｜デザインを深掘り MdN 株式会社モトヤは、手書き風のフォント「モトヤタッピー」を発売しました。OpenTypeフォントは各19,800円（税込）で、Windows向けにのみ提供されるTrueTypeフォントは13,200円（税込）です。2026年7月15日（水）までは、30％OFFの価格で購入できる発売記念キャンペーンも実施されています。 mdn https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Values/exp exp() CSS function - CSS | MDN The exp() CSS function is an exponential function that takes a number as an argument and returns the mathematical constant e raised to the power of the given... exp css function mdn https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Values/log log() CSS function - CSS | MDN The log() CSS function is an exponential function that returns the logarithm of a number. log css function mdn https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/corner-end-start-shape corner-end-start-shape CSS property - CSS | MDN The corner-end-start-shape CSS property specifies the shape of a box's block-end and inline-start corner, within its border-radius area. corner end start shape css https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/justify-self justify-self CSS property - CSS | MDN The CSS justify-self property sets the way a box is justified inside its alignment container along the appropriate axis. justify self css property mdn https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/timeline-scope timeline-scope CSS property - CSS | MDN The timeline-scope CSS property modifies the scope of a named animation timeline. timeline scope css property mdn https://mdn.co.jp/art-culture/ アート＆カルチャー｜デザインを深掘り MdN MdNはデザインとクリエイティブを深掘りするメディアです。デザインツールの表現手法や、エンタメの表現面を取材等、実用に役立つ・仕事のヒント・作品をより楽しむ情報をお届けします。 mdn https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/const const - JavaScript | MDN The const declaration declares block-scoped local variables. The value of a constant can't be changed through reassignment using the assignment operator, but... const javascript mdn https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/transform-style transform-style CSS property - CSS | MDN The transform-style CSS property sets whether children of an element are positioned in the 3D space or are flattened in the plane of the element. transform style css property mdn https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/font-weight font-weight CSS property - CSS | MDN The font-weight CSS property sets the weight (or boldness) of the font. The weights available depend on the font-family that is currently set. font weight css property mdn https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/dynamic-range-limit dynamic-range-limit CSS property - CSS | MDN The dynamic-range-limit CSS property specifies the maximum luminance allowed for High Dynamic Range (HDR) content. dynamic range limit css property mdn https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/scroll-margin-block-end scroll-margin-block-end CSS property - CSS | MDN The scroll-margin-block-end property defines the margin of the scroll snap area at the end of the block dimension that is used for snapping this box to the... scroll margin block end css https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/outline-color outline-color CSS property - CSS | MDN The outline-color CSS property sets the color of an element's outline. outline color css property mdn https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Values/box-edge box-edge CSS type - CSS | MDN box edge css type mdn https://developer.mozilla.org/en-US/docs/Web/CSS/Guides/Colors/Color_values CSS color values - CSS | MDN To represent a color in CSS, you have to find a way to translate the analog concept of css color values mdn https://developer.mozilla.org/en-US/docs/Web/CSS/Guides/CSSOM_view/Viewport_concepts Viewport concepts - CSS | MDN This article explains the concept of the viewport — what it is and its impact in terms of CSS, SVG, and mobile devices. This article defines the initial... viewport concepts css mdn Sponsored https://www.bootycallz.com/ Booty Callz - World's Sexiest Black Hookup Dating @ BootyCallz.com https://developer.mozilla.org/ja/docs/Mozilla/Firefox/Releases/2/Adding_feed_readers_to_Firefox Firefox へのフィードリーダーの追加 - Mozilla | MDN Firefox 2 より、Firefox はフィードを読む際に使う RSS または Atom フィードリーダを選択できるようになっています。この記事ではデフォルトではサポートされていないリーダを追加サポートさせる方法について説明します。 firefox mozilla mdn https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Values/ratio ratio CSS type - CSS | MDN ratio css type mdn https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/interpolate-size interpolate-size CSS property - CSS | MDN size css property mdn https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Values/mod mod() CSS function - CSS | MDN The mod() CSS function returns a modulus left over when the first parameter is divided by the second parameter, similar to the JavaScript remainder operator... mod css function mdn https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Values/fit-content_function fit-content() CSS function - CSS | MDN The fit-content() CSS function clamps a given size to an available size according to the formula min(maximum size, max(minimum size, argument)). fit content css function mdn https://developer.mozilla.org/en-US/docs/Web/CSS/Guides/Grid_layout/Relationship_with_other_layout_methods Relationship of grid layout to other layout methods - CSS | MDN CSS grid layout is designed to work alongside other parts of CSS, as part of a complete system for doing the layout. This guide explains how grid layout fits... grid layout other methods relationship css mdn https://developer.mozilla.org/en-US/docs/Web/CSS/Guides/Cascading_variables/Using_custom_properties Using CSS custom properties (variables) - CSS | MDN Custom properties (sometimes referred to as CSS variables or cascading variables) are entities defined by CSS authors that represent specific values to be... css custom properties using variables mdn https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Values/basic-shape/path path() CSS function - CSS | MDN path css function mdn https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/contain contain CSS property - CSS | MDN The contain CSS property indicates that an element and its contents are, as much as possible, independent from the rest of the document tree. Containment... contain css property mdn https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/border-right-color border-right-color CSS property - CSS | MDN The border-right-color CSS property sets the color of an element's right border. It can also be set with the shorthand CSS properties border-color or... border right color css property https://developer.mozilla.org/en-US/docs/Web/CSS/Guides/Fonts/Variable_fonts Variable fonts - CSS | MDN Variable fonts are an evolution of the OpenType font specification that enables many different variations of a typeface to be incorporated into a single file,... variable fonts css mdn https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Values/timeline-range-name timeline-range-name CSS type - CSS | MDN timeline range name css type https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Values/gradient/conic-gradient conic-gradient() CSS function - CSS | MDN gradient css function mdn https://developer.mozilla.org/en-US/docs/Web/CSS/Guides/Scroll-driven_animations/Timelines Scroll-driven animation timelines - CSS | MDN A common UI pattern involves elements that animate as the user scrolls vertically or horizontally across a page. These scroll-driven animations occur in direct... scroll driven animation timelines css mdn https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/mask-border-slice mask-border-slice CSS property - CSS | MDN The mask-border-slice CSS property divides the image set by mask-border-source into regions. These regions are used to form the components of an element's mask... mask border slice css property https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Selectors/:playing :playing CSS pseudo-class - CSS | MDN playing css pseudo class mdn https://developer.mozilla.org/en-US/docs/Web/CSS/Guides/Grid_layout/Masonry_layout Masonry layout - CSS | MDN Level 3 of the CSS grid layout specification defines masonry layout (also known as grid-lanes layout), which is accessed via the display values grid-lanes and... masonry layout css mdn https://developer.mozilla.org/en-US/docs/Web/API/TextEncoderStream TextEncoderStream - Web APIs | MDN The TextEncoderStream interface of the Encoding API converts a stream of strings into bytes in the UTF-8 encoding. It is the streaming equivalent of... web apis textencoderstream mdn https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/min-block-size min-block-size CSS property - CSS | MDN The min-block-size CSS property defines the minimum horizontal or vertical size of an element's block, depending on its writing mode. It corresponds to either... min block size css property https://developer.mozilla.org/en-US/docs/Web/CSS/Guides/Environment_variables CSS environment variables - CSS | MDN The CSS environment variables module defines the concept of environment variables and the env() function. Environment variables work similarly to custom... environment variables css mdn https://developer.mozilla.org/en-US/docs/Web/CSS/Guides/Display/Flow_layout_and_writing_modes Flow layout and writing modes - CSS | MDN The CSS 2.1 specification, which details how normal flow behaves, assumes a horizontal writing mode. Layout properties should work in the same way in vertical... flow layout writing modes css mdn https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/text-spacing-trim text-spacing-trim CSS property - CSS | MDN The text-spacing-trim CSS property controls the internal spacing set on Chinese/Japanese/Korean (CJK) punctuation characters between adjacent characters... text spacing trim css property https://developer.mozilla.org/en-US/docs/Web/CSS/Guides/Inline_layout/Inline_formatting_context Inline formatting context - CSS | MDN This guide explains the inline formatting context. inline formatting context css mdn Sponsored https://joi.com/ NSFW Character AI Chat – AI Girlfriend Chat Without Limits | JOI Spicy Explore AI chat models on JOI AI with virtual characters and digital celebrities. Chat, interact, and customize AI companions for immersive experiences. https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/-webkit-mask-box-image -webkit-mask-box-image CSS property - CSS | MDN The non-standard prefixed -webkit-mask-box-image shorthand property sets the mask image for an element's border box. webkit mask box image css https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/At-rules/@layer @layer CSS at-rule - CSS | MDN The @layer CSS at-rule is used to declare a cascade layer and can also be used to define the order of precedence in case of multiple cascade layers. layer css rule mdn https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Values/transform-function/rotate rotate() CSS function - CSS | MDN rotate css function mdn https://developer.mozilla.org/en-US/docs/Web/API/FormData FormData - Web APIs | MDN The FormData interface provides a way to construct a set of key/value pairs representing form fields and their values, which can be sent using the fetch(),... web apis formdata mdn https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Selectors/::column ::column CSS pseudo-element - CSS | MDN The ::column CSS pseudo-element represents the individual columns generated when a container is set to display its content in multiple columns via CSS... column css pseudo element mdn https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/mask mask CSS property - CSS | MDN mask css property mdn https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/break-inside break-inside CSS property - CSS | MDN The break-inside CSS property sets how page, column, or region breaks should behave inside a generated box. If there is no generated box, the property is... break inside css property mdn Sponsored https://www.fanvue.com/maisxlife Mai - Fanvue I have a lot to show you. A little snapshot of what to expect on my page: everything. Come dm me so I can show you... https://developer.mozilla.org/en-US/docs/Web/API/TextEncoder TextEncoder - Web APIs | MDN The TextEncoder interface enables you to encode a JavaScript string using UTF-8. web apis textencoder mdn https://developer.mozilla.org/en-US/docs/Web/API/URLPattern URLPattern - Web APIs | MDN The URLPattern interface of the URL Pattern API matches URLs or parts of URLs against a pattern. The pattern can contain capturing groups that extract parts of... web apis urlpattern mdn https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/animation animation CSS property - CSS | MDN The animation shorthand CSS property applies an animation between styles. It is a shorthand for animation-name, animation-duration, animation-timing-function,... animation css property mdn https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Values/transform-function/matrix3d matrix3d() CSS function - CSS | MDN css function mdn https://developer.mozilla.org/en-US/docs/Web/CSS/Guides/Syntax/At-rules At-rules - CSS | MDN At-rules are CSS statements that instruct CSS how to behave. They begin with an at-sign, @ (U+0040 COMMERCIAL AT), followed by an identifier. They include... rules css mdn https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/text-decoration text-decoration CSS property - CSS | MDN The text-decoration shorthand CSS property sets the appearance of decorative lines on text. It is a shorthand for text-decoration-line, text-decoration-color,... text decoration css property mdn https://developer.mozilla.org/en-US/docs/Web/API/URL/URL URL: URL() constructor - Web APIs | MDN The URL() constructor returns a newly created URL object representing the URL defined by the parameters. web apis url constructor mdn https://developer.mozilla.org/en-US/docs/Web/CSS/Guides/Positioned_layout/Using_z-index Using z-index - CSS | MDN The first article of this guide, Stacking without the z-index property, explains how stacking is arranged by default. If you want to create a custom stacking... using index css mdn