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Course Introduction：Common HTML attributes include class, id, src, alt, style, placeholder, etc. class is used for CSS or JS control elements, id uniquely identifies elements, src specifies resource path, alt provides image replacement text, style sets inline style, placeholder is the input box prompt text; attributes are written in the start label, the structure is attribute name="value", multiple attributes are separated by spaces, and the value is recommended to be wrapped in quotes; note that case is not sensitive but lowercase is recommended, do not miss quotation marks, avoid duplicate attributes, and ensure that the attribute value is legal.

2025-06-30 comment 0  666

Course Introduction：The keys to handling focus management in single-page applications (SPA) to improve accessibility experience include: 1. Manually set the focus to the main content area when page switching, such as focusing the title or container in useEffect when using ReactRouter, and ensuring that the target element is focused; 2. Limit the focus range in the modal box, mark the modal box through aria-modal and role, JavaScript controls the focus loop, and restores the original focus after closing; 3. Use the aria-live area to notify the screen reader when dynamic content is updated, distinguishing between polite and assertive prompt levels; 4. Pay attention to the reasonable order of the tab keys, hidden elements do not gain focus, and clickable areas maintain the focus style.

2025-08-04 comment 0  127

Course Introduction：minlength and maxlength are attributes in HTML that control the length of input box characters. Pay attention to the correct usage and common problems. For example: Setting minlength="5"maxlength="20" can limit the input characters between 5 and 20. 1. Attributes are only applicable to text type input types; 2. It is necessary to use it with required to avoid null values passing verification; 3. The browser prompt information may vary depending on the device; 4. Common problems include spelling errors, compatibility and script modification content resulting in invalidation; 5. In actual applications, it is recommended to use real-time counting style prompts and always perform back-end verification, while avoiding too small minls.

2025-07-25 comment 0  492

Course Introduction：Use tags to embed videos directly in web pages without third-party plug-ins; 2. It is recommended to use elements to provide various formats such as mp4, webm, ogg, etc. to ensure browser compatibility; 3. Add controls, muted, loop, preload, poster and other attributes to improve the playback experience; 4. Automatic playback needs to be matched with muted attributes to avoid being blocked by the browser; 5. Borders, rounded corners, shadows and responsive sizes can be set through CSS to optimize the video style; 6. Provide fallback text in the tag to prompt browsers that do not support video. Use these methods correctly to achieve native, compatible and beautiful web video embedding.

2025-07-30 comment 0  433

Course Introduction：SqlParameter Parameters.Add vs. AddWithValue: Choosing the Best MethodWhen working with SQL commands, you may encounter the need to add...

2025-01-10 comment 0  699

Course Elementary  13823

Course Introduction：Scala Tutorial Scala is a multi-paradigm programming language, designed to integrate various features of object-oriented programming and functional programming.

Course Elementary  82359

Course Introduction："CSS Online Manual" is the official CSS online reference manual. This CSS online development manual contains various CSS properties, definitions, usage methods, example operations, etc. It is an indispensable online query manual for WEB programming learners and developers! CSS: Cascading Style Sheets (English full name: Cascading Style Sheets) is an application used to express HTML (Standard Universal Markup Language).

Course Elementary  13177

Course Introduction：SVG is a markup language for vector graphics in HTML5. It maintains powerful drawing capabilities and at the same time has a very high-end interface to operate graphics by directly operating Dom nodes. This "SVG Tutorial" is intended to allow students to master the SVG language and some of its corresponding APIs, combined with the knowledge of 2D drawing, so that students can render and control complex graphics on the page.

Course Elementary  24627

Course Introduction：In the "AngularJS Chinese Reference Manual", AngularJS extends HTML with new attributes and expressions. AngularJS can build a single page application (SPAs: Single Page Applications). AngularJS is very easy to learn.

Course Elementary  27485

Course Introduction：Go is a new language, a concurrent, garbage-collected, fast-compiled language. It can compile a large Go program in a few seconds on a single computer. Go provides a model for software construction that makes dependency analysis easier and avoids most C-style include files and library headers. Go is a statically typed language, and its type system has no hierarchy. Therefore users do not need to spend time defining relationships between types, which feels more lightweight than typical object-oriented languages. Go is a completely garbage-collected language and provides basic support for concurrent execution and communication. By its design, Go is intended to provide a method for constructing system software on multi-core machines.