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HTML Versus XHTML XHTML is a stricter, more XML-based version of HTML. What is XHTML? XHTML stands for EXtensible HyperText Markup Language XHTML is a stricter, more XML-based version of HTML XHTML is HTML defined as an XML application XHTML is supported by all major browsers Why XHTML? XML is a markup language where all documents must be marked up correctly (be "well-formed"). XHTML was developed to make HTML more extensible and flexible to work with other data formats (such as XML). In addition, browsers ignore errors in HTML pages, and try to display the website even if it has some errors in the markup. So XHTML comes with a much stricter error handling.…
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HTML Video The HTML <video> element is used to show a video on a web page. Video Example Courtesy of Big Buck Bunny: Your browser does not support HTML5 video. The HTML <video> Element To show a video in HTML, use the <video> element: Example <video width="320" height="240" controls> <source src="movie.mp4" type="video/mp4"> <source src="movie.ogg" type="video/ogg"> Your browser does not support the video tag. </video> How it Works The controls attribute adds video controls, like play, pause, and volume. It is a good idea to always include width and height attributes. If he…
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HTML Web Storage API HTML Web Storage API; better than cookies. What is HTML Web Storage? With web storage, applications can store data locally within the user's browser. Before HTML5, application data had to be stored in cookies, included in every server request. Web storage is more secure, and large amounts of data can be stored locally, without affecting website performance. Unlike cookies, the storage limit is far larger (at least 5MB) and information is never transferred to the server. Web storage is per origin (per domain and protocol). All pages, from one origin, can store and access the same data. Web Storage API Objects Web storage provides two obj…
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HTML Web Workers API A web worker is an external JavaScript file that runs in the background, without affecting the performance of the page. What is a Web Worker? When executing scripts in an HTML page, the page becomes unresponsive until the script is finished. A web worker is an external JavaScript file that runs in the background, independently of other scripts, without affecting the performance of the page. You can continue to do whatever you want: clicking, selecting things, etc., while the web worker runs in the background. Web workers are useful for heavy code that can't be run on the main thread, without causing long tasks that make the page unresponsi…
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HTML Website Hosting Create Website with HTML Host Websites with W3Schools Spaces Get Started for Free Practice Coding Skills kAI AI Tutor Build Project…
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HTML YouTube Videos The easiest way to play videos in HTML, is to use YouTube. Struggling with Video Formats? Converting videos to different formats can be difficult and time-consuming. An easier solution is to let YouTube play the videos in your web page. YouTube Video Id YouTube will display an id (like tgbNymZ7vqY), when you save (or play) a video. You can use this id, and refer to your video in the HTML code. Playing a YouTube Video in HTML To play your video on a web page, do the following: Upload the video to YouTube Take a note of the video id Define an <iframe> element in your web page Let the src attribute point to the video URL Use th…
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HTTP Request Methods What is HTTP? The Hypertext Transfer Protocol (HTTP) is designed to enable communications between clients and servers. HTTP works as a request-response protocol between a client and server. Example: A client (browser) sends an HTTP request to the server; then the server returns a response to the client. The response contains status information about the request and may also contain the requested content. HTTP Methods GET POST PUT HEAD DELETE PATCH OPTIONS CONNECT TRACE The two most common HTTP methods are: GET and POST. The GET Method GET is used to request data from a specified resource. Note that the query string…
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HTTP Status Messages HTML Error Messages When a browser requests a service from a web server, an error might occur, and the server might return an error code like "404 Not Found". It is common to name these errors HTML error messages. But these messages are something called HTTP status messages. In fact, the server always returns a message for every request. The most common message is 200 OK. Below is a list of HTTP status messages that might be returned: 1xx: Information Message: Description: 100 Continue The server has received the request headers, and the client should proceed to send the request body 101 Switching Protocol…
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Keyboard ShortcutsKeyboard Shortcuts For Windows and MacKeyboard shortcuts are often used in modern operating systems and computer software programs. Learning and using keyboard shortcuts can save you a lot of time. Basic ShortcutsDescription Windows Mac OS Edit menu Alt + E Ctrl + F2 + F File menu Alt + F Ctrl + F2 + E View menu Alt + V Ctrl + F2 + V Select all text Ctrl + A Cmd + A Copy text Ctrl + C Cmd + C Find text Ctrl + F Cmd + F Find and replace text Ctrl + H Cmd + F New Document Ctrl + N Cmd + N Open a file Ctrl + O Cmd + O Print options Ctrl + P Cmd + P Save file Ctrl + S Cmd + S Paste text Ctrl + V Cmd + V Cut text Ctrl + X Cmd + X Redo text Ctrl + Y Shift + Cm…
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Keystore 是基于 Invision Community 5（IPS 5）的授权与发卡解决方案，覆盖“商品管理 → 卡密发放 → 授权校验 → 订单追踪”的完整闭环。它将验证服务与后台管理深度整合，提供即插即用的商业化基础设施。 - 组成 - 验证服务端：内置接口负责授权解密与完整性校验、时间窗校验、设备/域名绑定与证书签名。 - 客户端校验：发行版内置加固校验流程（HTTPS 强制、域名白名单、固定 UA、Base64URL 打包）。 - 后台管理：发卡商品（无价格字段）、卡密库、订单流转与日志审计，聚焦发卡与授权本身。 - 工作流 1) 创建发卡商品并配置卡密 → 2) 交付卡密给最终用户 → 3) 客户端发起加密验证 → 4) 服务端返回授权结果与约束（含签名/证书） → 5) 后台实时可视订单与授权状态。 ## 关键特性 - 安全通信：AES‑256‑CBC 加密 + Base64URL 打包 + HMAC 完整性校验 - 反篡改：固定 HTTPS 验证域名白名单，内置 UA，禁用明文回退 - 授权约束：支持域名/设备绑定与指纹校验，防止传播滥用 - 灵活发卡：卡密批量导入/生成，库存可视与状态管理 - 订单追踪：订单列表、状态流转与审计信息 - 轻量后台：发卡商品、卡密、订单一体化管理（无商品价格字段，更贴合外部商店结算） - 兼容性：适配 IPS 5.0.x，遵循框架规范，易于二开 Keystore-Invision Community 卡密发行系统 - Invision Community - OKAA ## 适用场…
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Pixels to Ems ConversionPixel to Em ConverterThe tool below allows you to work out the em sizes from pixels (or vice versa). Set a default pixel size for body (usually 16px) Then, convert a pixel value to em, based on the default pixel size Or, convert an em value to pixels, based on the default pixel size Set a default pixel size: px Convert PX to EM: px Convert EM to PX: em Convert Result: Body Font SizeIn the table below, select a body font size in pixels (px) to display a complete "px to em and percent" conversion table. Tip: The default font size is usually 16px. What is the difference between PX, EM and Percent? Pixel is a static measurement, while percent a…
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Using Emojis in HTML What are Emojis? Emojis look like images, but they are not. Emojis are letters (characters) from the UTF-8 (Unicode) character set: 😄 😍 💗 UTF-8 covers almost all of the characters and symbols in the world. Emoji Value 🗻🗻🗼🗼🗽🗽🗾🗾🗿🗿😀😀😁😁😂😂😃😃😄😄😅😅 HTML Emojis Examples Smileys 😀 😂 😊 😎 😜 Hands ✌ ✊ ☝ ✋ 👌 People 👮 🧕 👦 💏 🤴 Office 📈 💻 📌 📆 📒 Places ⛺ 🌋 🗽 🗿 🏢 Transport 🚈 🚗 🚢 🚌 🚀 Animals 🐴 🐕 🐘 🐻 🐞 Food ☕ 🌭 🍞 🍩 🍣 Plants 🌴 🌳 🌼 🍁 🥑 Fruits 🍇 🍊 🍏 🥝 🥥 Sports ⚽ 🏆 🤿 🏋 ⛳ Ea…
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W3Schools HTML Bootcamp HTML & CSS Bootcamp Learn with W3Schools. Live online learning sessions. Duration: 3 Weeks. Learn More Live Online Bootcamp In this bootcamp, you will learn the foundational skills needed to create beautiful and functional websites, from writing HTML markup to styling your pages with CSS. You will learn HTML and CSS over a 3 weeks period together with a live instructor and an interactive cohort of engaged learners! You Will Learn HTML and CSS fundamentals including Elements, Attributes, Tables, Forms and more. How to write best fit Semantic HTML How to create…
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W3Schools HTML Certificate W3Schools offers an Online Certification Program. The perfect solution for busy professionals who need to balance work, family, and career building. More than 50 000 certificates already issued! Get Your Certificate » W3Schools offers an Online Certification Program. The perfect solution for busy professionals who need to balance work, family, and career building. More than 50 000 certificates already issued! Get Your Certificate » Document your skills Improve your career Study at your own pace Save time and money Known brand Trusted by top companies Who Should Consider Getting Cer…
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XFRM Right Sidebar Pro 是一款专为 XenForo 资源管理器（XFRM）设计的高级边栏增强插件。通过创新的下载按钮集成技术和精美的卡片式设计，为您的资源页面带来前所未有的用户体验提升。 已经开发完成， 正式上线！这是付费版本，免费版本请在本站查找相关文件！
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You Have Learned HTML, Now What? HTML Summary This tutorial has taught you how to use HTML to create your own web site. HTML is the universal markup language for the Web. HTML lets you format text, add graphics, create links, input forms, frames and tables, etc., and save it all in a text file that any browser can read and display. For more information on HTML, please take a look at our HTML examples and our HTML reference. You can also test your HTML skills with HTML Exercises and HTML Quizzes. Now You Know HTML, What's Next? Learn CSS CSS lets you style your HTML pages. CSS gives you total control of the layout, without messing up the document content. To l…
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