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  • What are Server-Sent Events (SSE) and how do you use them with HTML?
    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 405 2025-07-10 12:26:02
  • How can html structure impact page loading performance?
    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 1012 2025-07-10 12:08:12
  • What's the semantic difference between the html section and article tags?
    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 300 2025-07-10 12:01:32
  • What is the base tag in the ?
    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 759 2025-07-10 12:00:06
  • What is the dfn (definition) element?
    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 477 2025-07-10 11:43:32
  • What is the poster attribute for the tag?
    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 764 2025-07-10 11:19:17
  • What is an HTML sitemap and how do you create one?
    What is an HTML sitemap and how do you create one?
    AnHTMLsitemapimprovesuserexperienceandSEObyofferingaclear,organizedlistofwebsitepages.Itenhancesnavigationforvisitors,aidssearchenginesindiscoveringnewcontent,andbenefitslargewebsiteswithcomplexstructures.Tocreateonemanually,startwithanHTMLfile,group
    HTML Tutorial . Web Front-end 214 2025-07-10 11:12:32
  • What is the basic structure of an HTML page?
    What is the basic structure of an HTML page?
    A basic HTML page structure consists of multiple key tags to define web page content and frameworks. 1. The page starts with an HTML5 document; 2. The tag contains the sum as the root element; 3. It contains metadata such as, character encoding, viewport settings, CSS and JS introduction; 4. It contains user-visible content such as titles, paragraphs, pictures, lists, etc.; 5. HTML5 has added semantic tags such as,,,,,, and to improve structural clarity and readability. Mastering these structures helps quickly build clear and maintainable web pages.
    HTML Tutorial . Web Front-end 157 2025-07-10 11:09:02
  • What are the most commonly used global attributes in html?
    What are the most commonly used global attributes in html?
    class, id, style, data-, and title are the most commonly used global attributes in HTML. class is used to specify one or more class names to facilitate style setting and JavaScript operations; id provides unique identifiers for elements, suitable for anchor jumps and JavaScript control; style allows for inline styles to be added, suitable for temporary debugging but not recommended for large-scale use; data-properties are used to store custom data, which is convenient for front-end and back-end interaction; title is used to add mouseover prompts, but its style and behavior are limited by the browser. Reasonable selection of these attributes can improve development efficiency and user experience.
    HTML Tutorial . Web Front-end 174 2025-07-10 10:58:51
  • What is HTML5 Geolocation API?
    What is HTML5 Geolocation API?
    HTML5GeolocationAPI obtains user geolocation information through the browser. The enable method is to use navigator.geolocation.getCurrentPosition() to get the location, provided that the user authorization is. 1. First check whether the browser supports: if("geolocation"innavigator); 2. Call the getCurrentPosition() method to obtain latitude and longitude; 3. Handle user permissions and errors. Notes include: it must run in an HTTPS environment, the mobile terminal is more accurate, the permission management of different browsers is different, the timeout mechanism and alternative solutions such as I
    HTML Tutorial . Web Front-end 707 2025-07-09 02:38:21
  • How to set a default value for an HTML input field?
    How to set a default value for an HTML input field?
    To set the default value of the HTML input box, the value attribute is mainly used. The specific methods are as follows: 1. Add the value attribute to the tag, such as the default value will be displayed when the page is loaded; 2. Distinguish between value and placeholder, the former is the actual default value, and the latter is only the prompt text; 3. The default value can be dynamically modified through JavaScript, such as using document.querySelector("input[name='username']").value="NewDefault"; to implement update operations in interactive logic.
    HTML Tutorial . Web Front-end 207 2025-07-09 02:35:31
  • Configuring Document Metadata Within the HTML head Element
    Configuring Document Metadata Within the HTML head Element
    Metadata in HTMLhead is crucial for SEO, social sharing, and browser behavior. 1. Set the page title and description, use and keep it concise and unique; 2. Add OpenGraph and Twitter card information to optimize social sharing effects, pay attention to the image size and use debugging tools to test; 3. Define the character set and viewport settings to ensure multi-language support is adapted to the mobile terminal; 4. Optional tags such as author copyright, robots control and canonical prevent duplicate content should also be configured reasonably.
    HTML Tutorial . Web Front-end 717 2025-07-09 02:30:11
  • Why is providing alt text for images crucial for html accessibility?
    Why is providing alt text for images crucial for html accessibility?
    AlttextisessentialforwebaccessibilityandSEObecauseitdescribesimagesforscreenreaderusersandhelpssearchenginesunderstandimagecontent.Itensuresuserswithvisualimpairmentsreceivethesameinformationassightedusers,explainsthepurposeofimagesusedaslinksorbutto
    HTML Tutorial . Web Front-end 612 2025-07-09 02:29:52
  • What is the ping attribute on an anchor tag?
    What is the ping attribute on an anchor tag?
    ThepingattributeinHTMLtracksoutboundlinkclicksbysendinganotificationtoaspecifiedURLwhenauserclicksalink.Forexample,usingsendsaPOSTrequesttothetrackerURLbeforenavigatingtothetargetpage.Itisusefulfortrackingoutboundlinks,securitylogging,andlightweighta
    HTML Tutorial . Web Front-end 523 2025-07-09 02:26:11

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