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  • What are HTML attributes, and how do I use them to provide additional information about elements?
    What are HTML attributes, and how do I use them to provide additional information about elements?
    HTML attributes are additional information added to HTML elements to control how they behave or represent. They appear in the element's starting tag as name-value pairs, such as name="value". For example, specify the type and placeholder in the input box:. Common properties include class, id, style, src, href, and alt, etc., which are suitable for different scenarios, such as style settings, resource links and barrier-free access. When adding attributes, you need to pay attention to using lowercase attribute names and wrapping the value in quotes. Multiple attributes are separated by spaces, and some attributes such as required can take effect without assignment. Specific application scenarios include improved accessibility support, form verification, performance optimization and SEO enhancement
    HTML Tutorial . Web Front-end 349 2025-06-23 00:41:04
  • What are ARIA roles, states, and properties?
    What are ARIA roles, states, and properties?
    ARIAroles,states,andpropertiesenhancewebaccessibilityfordynamiccontent.Rolesdefinewhatanelementis,suchasrole="button"forcustombuttonsorrole="navigation"forlandmarksections.Stateslikearia-expanded="true"indicatedynamiccon
    HTML Tutorial . Web Front-end 268 2025-06-23 00:39:51
  • How does HTML5 improve upon previous versions of HTML?
    How does HTML5 improve upon previous versions of HTML?
    HTML5significantlytransformedwebdevelopmentbyintroducingsemantictagslike,,and,whichimprovedcodereadability,accessibility,andSEO.Itenablednativemultimediasupportthroughandtags,eliminatingrelianceonpluginslikeFlash.HTML5enhancedformhandlingwithnewinput
    HTML Tutorial . Web Front-end 752 2025-06-23 00:33:51
  • How do I use headings correctly to create a logical document structure?
    How do I use headings correctly to create a logical document structure?
    Correctly using title levels, keeping the style consistent, the title is concise and clear, and not overuse of titles are the key to building a clear document structure. Titles should be progressive from level 1 to level 4, such as the first-level title is the general theme, the second-level title divides the main parts, and the third-level title further subdivides the content to avoid skipping grades; the software should be built-in title style instead of manually adjusting the format to ensure accessibility and directory generation; the title should be specific and clear to avoid blurring vocabulary, such as changing "Stuff About Dogs" to "Health Benefits for Owninga Dog"; at the same time, avoiding too many headings, new ideas should be introduced in each paragraph, and no headings should be used to mark the footer or side content.
    HTML Tutorial . Web Front-end 547 2025-06-23 00:32:42
  • What are the different media query types (e.g., screen, print, speech)?
    What are the different media query types (e.g., screen, print, speech)?
    Thearticleexplainstheuseofmediaqueriesinresponsivewebdesign,focusingonkeytypeslikescreen,print,andspeech.1.Screentargetsdigitaldisplaysforresponsivelayoutsusingbreakpointsandfeatureslikemin-width.2.Printcontrolsstylingforprinteddocumentsbyhidingnon-e
    HTML Tutorial . Web Front-end 541 2025-06-23 00:23:01
  • How do I use viewport meta tag to control the viewport behavior?
    How do I use viewport meta tag to control the viewport behavior?
    viewportmetatag is a key tag in HTML that controls how web pages are displayed on mobile devices. Its core role is to set viewport width and zoom behavior. It implements adaptation through the basic structure, where width=device-width makes the page width match the device screen, and initial-scale=1.0 sets the initial scaling ratio. Common configurations include: 1. It is recommended to use basic writing to support responsive design; 2. Use maximum-scale and user-scalable to control scaling carefully to avoid affecting accessibility; 3. The viewport width can be fixed under special needs, but it is not conducive to responsive layout. In addition, please note: multiple viewport tags are only the first one.
    HTML Tutorial . Web Front-end 819 2025-06-23 00:16:02
  • How do I use the disabled attribute to disable an input field?
    How do I use the disabled attribute to disable an input field?
    TodisableaninputfieldinHTML,usethedisabledattribute.Adddisabledwithinthetaglike,orusedisabled="disabled";bothworkthesame.WithJavaScript,setelement.disabled=truetodisableorfalsetoenable.Disableinputstopreventinteractionuntilconditionsaremet,
    HTML Tutorial . Web Front-end 155 2025-06-22 00:55:52
  • What is the Video API, and how do I use it to control video playback using JavaScript?
    What is the Video API, and how do I use it to control video playback using JavaScript?
    How to use JavaScript to control web video playback? The answer is through HTML5 elements and their related methods and properties. The specific steps are as follows: 1. Basic settings: Use tags with ids and select multiple video sources to enhance compatibility; 2. Control playback: Call play(), pause() through JavaScript, set currentTime, volume and muted properties to achieve playback control; 3. Handle events: listen to play, pause, ended and other events to respond to changes in video status; 4. Custom controls: build UI elements such as play/pause buttons, and handle loading status and barrier-free support; 5. Pay attention to browser restrictions, such as muted automatic playback strategy
    HTML Tutorial . Web Front-end 553 2025-06-22 00:55:11
  • What are shadow DOM and custom elements?
    What are shadow DOM and custom elements?
    ShadowDOM is used to create independent DOM trees to implement style and structure isolation, and CustomElements is used to define custom HTML elements to improve reusability and semantics. 1. ShadowDOM provides style isolation, structural encapsulation and avoid conflicts, and is created through the attachShadow method. 2.CustomElements implements componentization by inheriting the HTMLElement class and registering new tags. 3. The two are often used in combination to create ShadowDOM in the constructor to implement plug-and-play components. 4. Application scenarios include building component libraries, encapsulating third-party components, and modules that require highly isolated. 5. Note that the naming must include short horizontal lines and mode selection affects external access
    HTML Tutorial . Web Front-end 597 2025-06-22 00:54:12
  • What are common HTML attributes (e.g., class, id, style, title, src, href)?
    What are common HTML attributes (e.g., class, id, style, title, src, href)?
    HTML attributes are used to add extra information to tags. Class and id are used for positioning and styles. Class can be reused and id is unique. Style is used for inline styles but is not recommended for large-scale use. Title provides mouse hover prompts. Src introduces external resources such as pictures and scripts, and href specifies link address. Other common attributes include alt, placeholder, target="_blank" and rel="nofollow".
    HTML Tutorial . Web Front-end 671 2025-06-22 00:53:42
  • How do I use the readonly attribute to make an input field read-only?
    How do I use the readonly attribute to make an input field read-only?
    To make the input field read-only, use the readonly property. 1. Add readonly attribute to the input tag to achieve read-only effect; 2. readonly allows users to select and copy content and submit it with the form; 3. Unlike disabled, the latter is not submitted with the form and cannot gain focus; 4. The read-only state can be dynamically controlled through JavaScript, such as setting input.readOnly=true or false; 5. Pay attention to testing form submission behavior, accessibility and visual style when using it to improve user experience.
    HTML Tutorial . Web Front-end 824 2025-06-22 00:52:52
  • How do I use the element to add subtitles or captions to audio and video elements?
    How do I use the element to add subtitles or captions to audio and video elements?
    The key to adding subtitles or titles with elements is to link correctly formatted text files (such as WebVTT) to media elements. 1. Used to specify the timed text track in or, suitable for providing translation, closing subtitles or adding metadata prompts; 2. Before using, make sure that the format of the WebVTT file is correct: the first behavior is WEBVTT, there are two new lines between each prompt block, and the time format is HH:MM:SS.mm; 3. Load subtitles in HTML through attributes such as src, kind, srclang, label, etc., and set default to enable subtitles by default; 4. Common problems include that the browser does not display subtitles, time is out of sync, path errors or offline loading failures, and check the MIME type, time code, and network
    HTML Tutorial . Web Front-end 527 2025-06-22 00:51:41
  • How do I use shadow DOM and custom elements to create web components?
    How do I use shadow DOM and custom elements to create web components?
    ShadowDOM and custom elements are the core of WebComponents for encapsulating standalone HTML, CSS, and JavaScript. 1. ShadowDOM creates an isolated DOM tree through the attachShadow() method to avoid style and logic conflicts; 2. Custom elements register new tags by inheriting HTMLElement and using customElements.define(); 3. Component encapsulation can be implemented in the constructor; 4. Lifecycle callbacks such as connectedCallback and attribute listening to observedAttributes can control component behavior; 5. Note
    HTML Tutorial . Web Front-end 546 2025-06-22 00:50:32
  • What are tags, and what are they used for?
    What are tags, and what are they used for?
    Meta tags have four core functions in HTML pages: 1. Define basic web page information, such as character sets, authors and descriptions; 2. Control the display effect of the mobile terminal and adapt to the viewports of different devices; 3. Provide title, description and image information during social sharing; 4. Control search engine indexing behavior to determine whether the page is included or tracked links.
    HTML Tutorial . Web Front-end 156 2025-06-22 00:48:31

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