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  • What is the HTML Drag and Drop API?
    What is the HTML Drag and Drop API?
    The working principle of HTMLDragandDrop API includes the following steps: 1. Set elements to be dragged, set draggable="true" and handle dragstart events to define the behavior at the beginning of the drag; 2. Process events during the dragging process, such as dragover and dragleave to control the drag interaction; 3. Get data in the drop event and perform placement operations, while canceling the default behavior to allow placement; 4. Add visual feedback to improve the user experience. Common use cases include list sorting, file uploading and building kanban interfaces. When using it, you need to pay attention to calling e.preventDefault(), controlling effects and avoiding performance-affecting operations.
    HTML Tutorial . Web Front-end 320 2025-07-13 01:10:21
  • What is the HTML Document Outline?
    What is the HTML Document Outline?
    HTML document outline is a content structure automatically constructed by the browser based on title tags and semantic tags. It is used to express the hierarchical relationship of page information and affect accessibility, SEO and browser behavior. Its core construction methods include: 1. Use titles in hierarchical order without skipping; 2. Used in conjunction with semantic tags, each block can have a title structure independently; 3. Avoid multiple h1s to improve compatibility and SEO. Common misunderstandings include title jumps, random nesting of h1s, and ignoring auxiliary technology needs. Outline issues can be checked through browser extensions, W3C verification tools, or screen readers. Reasonable organization of titles and semantic labels can effectively improve the clarity of document structure.
    HTML Tutorial . Web Front-end 782 2025-07-13 01:07:32
  • What is the translate='no' attribute?
    What is the translate='no' attribute?
    Thetranslate="no"attributeinHTMLpreventsspecifictextfrombeingtranslatedbybrowsersortranslationtools.Itisusedtokeepbrandnames,technicalterms,codesnippets,andmixed-languagecontentunchangedduringautomatictranslation.Thisattributecanbeappliedto
    HTML Tutorial . Web Front-end 185 2025-07-13 01:06:51
  • Applying Basic Styling Directly with the HTML style Attribute
    Applying Basic Styling Directly with the HTML style Attribute
    Scenarios suitable for using inlinestyle include: 1. Temporary debugging, such as quickly testing the style of a certain element; 2. Avoid external links in small projects or simple pages; 3. Dynamically generate styles, such as inserting styles when JS creates nodes. When using it, you need to pay attention to the format: attribute names are named with small camels, and multiple styles are separated by semicolons. Common errors include incorrect naming, missing semicolons and missing units. Compared with class styles, inlinestyle is not easy to maintain and reuse, and has higher priority, affecting debugging. It is recommended to use only when using rapid prototyping, email HTML pages, or JS dynamic computing styles to avoid large-scale abuse to reduce late maintenance costs.
    HTML Tutorial . Web Front-end 840 2025-07-13 01:00:31
  • How to add a preloader or loading screen to an HTML website?
    How to add a preloader or loading screen to an HTML website?
    To add loading animation to a web page, first create an animation structure and set the style with HTML and CSS, and then hide the animation after the page loading is completed through JavaScript. The specific steps are as follows: 1. Create an HTML structure for loading animations, such as a div containing a rotating icon; 2. Use CSS to set animation styles, including centered display, background color and animation effects; 3. Listen to the window.onload event through JavaScript, and hide the animation after the page resource is loaded; 4. You can combine the DOMContentLoaded event or imagesLoaded library to achieve more accurate load control; 5. Pay attention to avoiding animations hindering user interaction, adapt to mobile terminals and optimize page loading
    HTML Tutorial . Web Front-end 140 2025-07-13 00:55:41
  • How to use the picture element for responsive images?
    How to use the picture element for responsive images?
    Using elements allows better handling of responsive images, which enables the loading of the most appropriate images based on screen size, resolution and format through multiple and one implementation. Specifically, it includes: 1. Different cropped images under different screen sizes; 2. Supports modern formats such as WebP or AVIF; 3. High-definition pictures of high-resolution devices. Structurally, you need to use the definition conditions and image sources in turn, and use them as fallback schemes. At the same time, you should always include, use srcset instead of src, and specify the format through type to ensure compatibility. In addition, breakpoints should be set reasonably, pictures should be optimized, and valid alt text should be retained. In simple scenarios, only imgsrcset can be used to implement responsiveness.
    HTML Tutorial . Web Front-end 668 2025-07-13 00:50:31
  • Setting Default Values for Form Inputs with the HTML value Attribute
    Setting Default Values for Form Inputs with the HTML value Attribute
    The most direct way to set the default value of the form input box is to use the HTML value attribute. The value attribute is used to specify the initial value of the form element, such as:. Common elements that support this attribute include text input boxes, password boxes, radio buttons, check boxes (need to be selected by default with checked settings), submit buttons, etc. Correct usage methods include setting strings for text input, setting legal values for numeric input, and transmitting hidden fields. Notes include: avoid unescaped special characters and elements with selected instead of value, and default values should be written in the tag content. Rational use of value can improve user experience and reduce input burden.
    HTML Tutorial . Web Front-end 431 2025-07-13 00:35:42
  • What is the difference between role='button' and the element?
    What is the difference between role='button' and the element?
    Using native elements is usually better than role="button" because the former comes with interactive features and barrier-free support. 1. The default can focus and respond to Enter and Space keys; 2. Automatically submit forms and follow browser accessibility standards; 3. Role="button" requires manual keyboard interaction, focus style and ARIA attributes; 4. Role="button" should be used only in specific scenarios such as SVG or in restricted systems; 5. Use native buttons to save time and improve accessibility experience.
    HTML Tutorial . Web Front-end 218 2025-07-13 00:03:12
  • What are web workers and how do they relate to HTML?
    What are web workers and how do they relate to HTML?
    Webworkers are independent threads running in the browser background, used to perform time-consuming tasks without blocking the user interface. They are implemented through JavaScript files and are started by scripts in HTML pages, but once run, they are separated from the main thread. 1. Webworkers cannot directly access the DOM to ensure page stability; 2. They realize secure communication with the main thread through postMessage() and onmessage; 3. It is suitable for processing CPU-intensive tasks such as images, complex computing, data analysis; 4. It supports some APIs such as setTimeout, fetch and IndexedDB; 5. When using it, you need to pay attention to debugging difficulties, memory usage, cross-domain restrictions and other issues.
    HTML Tutorial . Web Front-end 939 2025-07-12 03:03:02
  • Can you build a website with only HTML?
    Can you build a website with only HTML?
    Yes, you can build a website with just HTML. HTML is the basis of web page content, which can add titles, paragraphs, lists, images, links, tables, and forms, and structure the page through semantic tags. However, HTML-only websites cannot achieve styles, animations or interactive effects, and their appearance is relatively basic. Using HTML only is suitable for scenarios such as rapid prototyping, internal tools, learning purposes, and email templates.
    HTML Tutorial . Web Front-end 961 2025-07-12 02:56:52
  • How to validate an HTML document for errors
    How to validate an HTML document for errors
    There are three ways to verify whether there are any errors in the HTML document. 1. Use the W3CMarkupValidationService online tool to upload files, enter URLs or paste code to check syntax and tag problems; 2. Install HTMLHint plug-in in VSCode to achieve real-time detection, timely discover and correct errors; 3. Use the command line tool vnu.jar to batch check multiple files, support local operation and can be integrated into the construction process, and can discover syntax and semantic problems. These three methods are applicable to different scenarios, which helps to improve web page compatibility and accessibility.
    HTML Tutorial . Web Front-end 261 2025-07-12 02:53:41
  • What are the differences and use cases for html textarea and input type text?
    What are the differences and use cases for html textarea and input type text?
    The main difference is that textarea supports multiple lines of text input, while inputtext is only available in a single line. 1. Use inputtype="text" to be suitable for short and single-line user input, such as username, email address, etc., and can set maxlength to limit the number of characters. The browser provides automatic filling function, making it easier to uniformly style across browsers; 2. Use textarea for scenarios that require multiple lines of input, such as comment boxes, feedback forms, support line breaks and paragraphs, and can control the size through CSS or disable the adjustment function. Both support form features such as placeholders and required fills, but textarea defines the size through rows and cols, and input uses the size attribute.
    HTML Tutorial . Web Front-end 828 2025-07-12 02:48:42
  • How to create a 'back to top' button with HTML and JavaScript?
    How to create a 'back to top' button with HTML and JavaScript?
    To add the "Back to Top" button, first create the button element in HTML and set the id, such as ↑ back to top; then set the fixed positioning, lower right corner position and hide the default display through CSS, and add styles such as background color, rounded corners and shadows; then listen to scroll events in JavaScript, and display the button when the scroll distance exceeds the set value (such as 300 pixels), otherwise hide it; finally bind the click event for the button, and use window.scrollTo({top:0, behavior:'smooth'}) to achieve a smooth return to the top effect.
    HTML Tutorial . Web Front-end 229 2025-07-12 02:46:51
  • What are the del and ins tags used for?
    What are the del and ins tags used for?
    The and tags in HTML are used to mark deleted or inserted text in a document to display modifications or revisions. It indicates deletion, which is displayed in strikethrough style by default, and the datetime attribute can be added to record the deletion time; for example: outdatedcontent. It indicates insertion, which is displayed in an underscore style by default. It also supports the datetime attribute to record the insertion time; for example: newlyaddedtext. These two tags are commonly used for version control, content updates, collaboration tools and improved accessibility experience, and are suitable for meaningful changes rather than minor corrections.
    HTML Tutorial . Web Front-end 794 2025-07-12 02:45:52

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