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- How to create nested lists in HTML?
- To create nested lists in HTML, the key is to use them correctly, and tag them and keep them structured clearly. 1. Use or wrap a list item, where an unordered list is defined, an ordered list is defined, and each list item is wrapped by a tag. 2. The key to implementing nesting is to insert a new or inside a certain place to form a child list. 3. It is recommended to maintain good indentation habits and avoid mixing different list types to improve code readability and maintenance. 4. Common mistakes include forgetting to close the tag, placing it directly outside another or inserting a block-level element inside, which will destroy the list structure.
- HTML Tutorial . Web Front-end 191 2025-07-10 13:42:51
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- What is the decoding attribute for images (async, sync, auto)?
- ThedecodingattributeinHTMLspecifieshowbrowsersshoulddecodeimages,withvaluesasync,sync,andauto.1.Asyncdecodesimagesoffthemainthread,improvingperformancefornon-criticalorlazy-loadedimages.2.Syncdecodesimagesonthemainthread,ensuringquickdisplayforcritic
- HTML Tutorial . Web Front-end 844 2025-07-10 13:20:42
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- What is an HTML validator and why should I use it?
- AnHTMLvalidatorchecksHTMLcodeforsyntaxerrors,structuralissues,andcompliancewithwebstandards,ensuringcross-browserconsistency,betteraccessibility,improvedSEO,andeasiermaintenance.1.Itidentifiesmismatchedorunclosedtags,impropernesting,deprecatedtags,an
- HTML Tutorial . Web Front-end 355 2025-07-10 13:06:31
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- What is the purpose of the address element?
- Elements are used to mark contact information related to web pages or articles, and are suitable for semantic organizational contact information. 1. Use it to display addresses, phone numbers, emails, etc. in the page footer, author profile or contact page; 2. It is not used to provide example addresses that are not related to contact; 3. Support includes physical addresses, emails, phone numbers, URLs and social media links; 4. Improve accessibility experience and help screen readers quickly locate contact information; 5. It has limited effect on SEO, but it helps search engines understand content intentions; 6. The default browser is displayed in italics, and can be customized through CSS. When using it, make sure that the information is directly related to the current page or the author.
- HTML Tutorial . Web Front-end 706 2025-07-10 12:56:12
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- How to create a responsive HTML email?
- The following methods are required to create responsive HTML messages: 1. Use inline styles to ensure compatibility; 2. Use table layout to replace Flexbox or Grid; 3. Set viewport tags, fixed-width containers, picture max-width and use table simulation buttons for mobile adaptation; 4. Previews must be tested on multiple clients and real devices. This can improve the display stability and user experience on different devices and email clients.
- HTML Tutorial . Web Front-end 897 2025-07-10 12:53:31
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- What is the time element and the datetime attribute?
- Theelementanddatetimeattributeareusedtorepresentdatesandtimesinastructured,machine-readableformat.1.Theelementprovidessemanticmeaningwhenpairedwiththedatetimeattribute,whichspecifiesdatesandtimesinstandardizedformatssuchasYYYY-MM-DD,HH:MM,orfulldatet
- HTML Tutorial . Web Front-end 170 2025-07-10 12:48:35
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- How to distinguish between block-level and inline elements in html?
- Block-level elements occupy one row, and elements within the row coexist with other content. Common block-level elements include,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, Common elements in the line include,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, Element types can be judged through developer tools, layout presentation, document query or adding borders. The display attribute of CSS can change the element display type, such as setting span to block or setting div to inline, the final performance is controlled by CSS.
- HTML Tutorial . Web Front-end 699 2025-07-10 12:48:12
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- What are Server-Sent Events (SSE) and how do you use them with HTML?
- Server-SentEvents (SSE) is an HTTP-based HTML5 standard API that allows servers to push real-time data to clients one-way. 1. It establishes a persistent connection through the EventSource object. The server sends data in text/event-stream format, and each push triggers client event processing; 2. It is simple to use, and the front-end only needs to listen to message events or specific event types to receive and process data; 3. The back-end needs to set Content-Type to text/event-stream, and continuously output messages that match the format; 4. Common precautions include solving cross-domain problems, controlling push frequency, and testing browser compatibility
- HTML Tutorial . Web Front-end 388 2025-07-10 12:26:02
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- How can html structure impact page loading performance?
- HTML structure has an important impact on page loading performance, which is mainly reflected in four aspects: First, reduce the number of DOM nodes, avoid unnecessary packaging elements and excessive use of semantic tags, and merge duplicate structures to improve parsing efficiency; Second, control the size of HTML files, and automatically optimize the structure by compressing output, avoiding inline large amounts of data, and using frameworks to automatically optimize the structure; Third, load key resources in advance, such as inline key CSS, controlling script loading with defer or async attributes, and use preload to prioritize important files; Fourth, keep the structure clear, use the title level reasonably, prefix the main content, and reduce dynamic insertion of JS to optimize SEO and first-screen rendering.
- HTML Tutorial . Web Front-end 989 2025-07-10 12:08:12
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- What's the semantic difference between the html section and article tags?
- When using HTML and tags, the core difference is semantics: used to organize content blocks related to topics, and to wrap content that can exist independently. 1. Applicable to blocks with titles, logically divided within the page, such as product page specifications, comments and related product parts; 2. Applicable to content that can be reused such as blog posts, news stories or comments, such as each independent article on the homepage of the blog or every comment section; 3. Both improve accessibility and SEO. Correct use helps screen readers navigation and search engines understand the page structure. Although there is no visual difference, semantic clarity is better than ordinary use.
- HTML Tutorial . Web Front-end 264 2025-07-10 12:01:32
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- What is the base tag in the ?
- HTML tags are used to specify the basic URL of all relative paths of the page. They are often used in CMS templates, email templates and SPA projects. They are located in and can only appear once. The basic path and link opening method are defined through the href and target attributes. When using it, you need to pay attention to its impact on all relative paths to avoid resource loading errors. During debugging, you can view the path resolution through the developer tools.
- HTML Tutorial . Web Front-end 741 2025-07-10 12:00:06
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- What is the dfn (definition) element?
- It is a tag used in HTML to mark the definition of a term, representing "definitionterm". It is often used in conjunction with explanation when the term first appears to improve semantics and accessibility. 1. Used to mark the definition of professional terms, abbreviations or uncommon vocabulary; 2. Used frequently in combination to enhance semantic clarity; 3. Displayed in italics by default, but can be customized with CSS; 4. It should only be used when it first appears to avoid abuse affecting readability; 5. Explanation text should not be wrapped, but the term itself, which cannot be replaced by emphasis labels.
- HTML Tutorial . Web Front-end 449 2025-07-10 11:43:32
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- What is the poster attribute for the tag?
- Poster attributes are used in the tag to specify the image displayed before the video starts playing to provide a visual preview. ① It improves the user experience by displaying thumbnails related to the video content; ② Encourage users to click to play; ③ It is especially useful for mobile device users; only the image URL is required when using it, such as; it is recommended that the image format is .jpg, .png or .webp and optimize it; but it can not be used when automatically playing videos, performance-sensitive pages, or CSS backgrounds have been used.
- HTML Tutorial . Web Front-end 752 2025-07-10 11:19:17
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- What is an HTML sitemap and how do you create one?
- AnHTMLsitemapimprovesuserexperienceandSEObyofferingaclear,organizedlistofwebsitepages.Itenhancesnavigationforvisitors,aidssearchenginesindiscoveringnewcontent,andbenefitslargewebsiteswithcomplexstructures.Tocreateonemanually,startwithanHTMLfile,group
- HTML Tutorial . Web Front-end 188 2025-07-10 11:12:32
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