国产av日韩一区二区三区精品,成人性爱视频在线观看,国产,欧美,日韩,一区,www.成色av久久成人,2222eeee成人天堂

current location：Home > Technical Articles > Daily Programming > HTML Knowledge

  • How to add an image in HTML
    How to add an image in HTML
    To display images on web pages, use the HTML img tag, the syntax is: imgsrc="image path" alt="alternative text". 1. The src attribute specifies the image path, supports relative paths or absolute URLs; 2. The alt attribute is used for alternative text when the image cannot be loaded and improves barrier-free access; 3. You can set the size through width and height, or use CSS to control the style more flexibly; 4. Other common attributes include title (prompt text), loading="lazy" (lazy loading), class or id (with CSS); 5. It is recommended to use .jpg and .png
    HTML Tutorial . Web Front-end 424 2025-07-12 00:28:22
  • Implementing Responsive Images with the HTML srcset and sizes Attributes
    Implementing Responsive Images with the HTML srcset and sizes Attributes
    srcset and sizes are key properties for HTML implementation of responsive images. srcset provides multiple image sources and their width or pixel density, such as 400w and 800w, and the browser selects the appropriate image accordingly; sizes defines the display width of the image under different screen widths, such as (max-width: 600px)100vw, 50vw, so that the browser can more accurately match the image size. In actual use, you need to prepare multi-size pictures, clearly named, design layout in accordance with media query, and test the performance of the equipment to avoid ignoring sizes or unit errors, thereby saving bandwidth and improving performance.
    HTML Tutorial . Web Front-end 850 2025-07-12 00:15:11
  • What is the difference between an element, a tag, and an attribute?
    What is the difference between an element, a tag, and an attribute?
    InHTML,elements,tags,andattributesaredistinctbutrelatedconcepts.1.Anelementisthecompletestructure,consistingofanopeningtag,content,andaclosingtag,suchasThisisaparagraph..2.Tagsaretheactualcodeusedtodefineelements,includingopeningtagslikeandclosingtag
    HTML Tutorial . Web Front-end 642 2025-07-12 00:11:21
  • What is the value attribute for a list item () in an ordered list?
    What is the value attribute for a list item () in an ordered list?
    The labels in ordered list() use the value attribute to customize the number of list items. 1. By default, the browser automatically numberes according to the location; 2. Use value to override this behavior, which is suitable for list paging, dynamic content or scenes where fixed numbers are required; 3. Once the value of an item is set, subsequent items will be incremented based on this value; 4. The value must be a positive integer, which is only valid in it, does not affect the style, and compatibility should be tested with caution.
    HTML Tutorial . Web Front-end 787 2025-07-12 00:05:12
  • Embedding Images Using the HTML img Tag
    Embedding Images Using the HTML img Tag
    When embedding images with HTML tags, you need to pay attention to path settings, alt descriptions and responsive processing. 1. The path settings must be accurate, distinguishing between relative paths, subdirectory paths and absolute URLs; 2. Clear and concise alt alternative text must be filled in to improve accessibility and SEO; 3. It is recommended to use CSS to control width and height to avoid layout jitter, and you can also set width or height to achieve similar scaling; 4. Optional properties such as loading="lazy" delay loading, decoding="async" asynchronous decoding, and srcset multi-resolution adaptation can improve performance and responsive effects.
    HTML Tutorial . Web Front-end 157 2025-07-12 00:04:12
  • How to center a div or image in HTML
    How to center a div or image in HTML
    To center the div or image, it can be achieved through various CSS methods. 1. Use margin:0auto to horizontally center block-level elements with fixed width; 2. Flexbox layout can achieve horizontal and vertical centering at the same time by setting the parent container display:flex, justify-content:center and align-items:center; 3. Use display:grid and place-items:center to complete centering at the same time; 4. For pictures, you can also use text-align:center to center the picture horizontally in the parent container. Different methods have different application scenarios, and you need to choose a matching solution according to your needs.
    HTML Tutorial . Web Front-end 286 2025-07-11 03:23:12
  • What is a basic HTML boilerplate template
    What is a basic HTML boilerplate template
    ThebasicHTMLboilerplateprovidesaminimalstructureforbuildingwebpages.ItstartswiththedeclarationtoenableHTML5mode,followedbythetagwithalanguageattributeforaccessibilityandSEO.Thesectioncontainsmetadatalikecharacterencoding,viewportsettings,andthepageti
    HTML Tutorial . Web Front-end 861 2025-07-11 03:20:11
  • Working with Reusable Content Fragments Using the HTML template Tag
    Working with Reusable Content Fragments Using the HTML template Tag
    Tags are a tag introduced by HTML5 to define reusable content fragments. They are not rendered immediately, but can be dynamically inserted through JavaScript. The usage process includes: 1. Defining the template; 2. Cloning the content; 3. Inserting the DOM. For example, get the template through document.getElementById, call cloneNode(true) and insert the page. When dynamically filling the data, content binding can be achieved by operating the cloned DOM elements, which is suitable for building product lists, user cards and other components. When using it, be careful not to directly access template sub-elements, avoid ID conflicts, handle style scopes, and can also create encapsulation components with WebComponents.
    HTML Tutorial . Web Front-end 960 2025-07-11 03:19:32
  • How to add audio to an HTML page?
    How to add audio to an HTML page?
    To add audio to a web page, you need to use HTML5 tags and pay attention to format compatibility and browser policies. The specific steps are as follows: 1. Use tags to embed audio files, specify the path through the src attribute and add controls display control bars; 2. Ensure that multiple format support such as MP3 and OGG are provided to be compatible with different browsers; 3. If you need automatic playback, it is recommended to add muted attributes to comply with browser restrictions; 4. You can customize the playback interface through JavaScript or use CSS to adjust the control style.
    HTML Tutorial . Web Front-end 498 2025-07-11 03:10:31
  • Creating Hyperlinks for Navigation with the HTML a Tag
    Creating Hyperlinks for Navigation with the HTML a Tag
    Using HTML tags, you can use the href attribute to realize page jump, open new windows, positioning within pages and email and phone link functions. 1. Basic usage: Specify the target address through href, such as accessing a web page; 2. Open a new window: add target="_blank" and rel="noopener" attributes; 3. Jump within the page: combine id and # symbol to achieve anchor point positioning; 4. Email phone link: use mailto: or tel: protocol to trigger system applications.
    HTML Tutorial . Web Front-end 230 2025-07-11 03:03:02
  • What is the cite attribute on and tags?
    What is the cite attribute on and tags?
    The cite attribute of HTML is used to specify the source for the reference content in and. Its main functions include: 1. Improve the accessibility experience, where screen readers can provide context; 2. Indirectly enhance SEO to help search engines understand the content structure and source; 3. Improve code readability through semantic marking. Although the browser does not display cite content by default, it can be visualized by manually adding or using CSS's ::after pseudo-element. In addition, the cite attribute should be used with visible attributions (such as "-Author" or link) and must be ensured to point to a valid URL to ensure that the user has an intuitive understanding of the source of the reference.
    HTML Tutorial . Web Front-end 520 2025-07-11 03:01:22
  • What is the aria-live attribute and when should you use it?
    What is the aria-live attribute and when should you use it?
    Thearia-liveattributemakesdynamicwebcontentaccessiblebyannouncingchangestoscreenreaderusers.Itdesignates"live"regionswhereupdatesareautomaticallyreadwhentheychange,usingvalueslikeoff,polite,andassertive.1.Usepolitefornon-urgentupdateslikefo
    HTML Tutorial . Web Front-end 534 2025-07-11 02:53:21
  • How to use the map and area tags for an HTML image map?
    How to use the map and area tags for an HTML image map?
    To set different parts of the image, click links, use HTML and tags. 1. Use the usemap attribute of the tag to associate it with the element of the specified name; 2. Add multiple tags to define each area; 3. Each sets the shape, coordinates and links through shape, coords and href respectively. Ensure image size matches coordinates and use alt and title attributes to enhance accessibility and prompt information.
    HTML Tutorial . Web Front-end 189 2025-07-11 02:48:31
  • How to create a table with merged cells (colspan and rowspan) in HTML?
    How to create a table with merged cells (colspan and rowspan) in HTML?
    To create a table that merged cells in HTML, use the colspan and rowspan properties. 1. Colspan is used to merge cells horizontally, setting a position of one cell occupying multiple columns. For example, when the table header spans two columns, using colspan="2"; 2. rowspan is used to merge cells vertically, making cells span multiple rows, suitable for merging content in vertical directions; 3. When using it, you need to pay attention to adjusting the number of other cells to avoid misalignment. It is recommended to draw sketches first and then encode them to keep the structure clear, and test browser compatibility to avoid maintenance difficulties due to excessive nesting.
    HTML Tutorial . Web Front-end 753 2025-07-11 02:47:42

Tool Recommendations

jQuery enterprise message form contact code

jQuery enterprise message form contact code is a simple and practical enterprise message form and contact us introduction page code.
form button
2024-02-29

HTML5 MP3 music box playback effects

HTML5 MP3 music box playback special effect is an mp3 music player based on HTML5 css3 to create cute music box emoticons and click the switch button.

HTML5 cool particle animation navigation menu special effects

HTML5 cool particle animation navigation menu special effect is a special effect that changes color when the navigation menu is hovered by the mouse.
Menu navigation
2024-02-29

jQuery visual form drag and drop editing code

jQuery visual form drag and drop editing code is a visual form based on jQuery and bootstrap framework.
form button
2024-02-29

Organic fruit and vegetable supplier web template Bootstrap5

An organic fruit and vegetable supplier web template-Bootstrap5
Bootstrap template
2023-02-03

Bootstrap3 multifunctional data information background management responsive web page template-Novus

Bootstrap3 multifunctional data information background management responsive web page template-Novus
backend template
2023-02-02

Real estate resource service platform web page template Bootstrap5

Real estate resource service platform web page template Bootstrap5
Bootstrap template
2023-02-02

Simple resume information web template Bootstrap4

Simple resume information web template Bootstrap4
Bootstrap template
2023-02-02

Cute summer elements vector material (EPS PNG)

This is a cute summer element vector material, including the sun, sun hat, coconut tree, bikini, airplane, watermelon, ice cream, ice cream, cold drink, swimming ring, flip-flops, pineapple, conch, shell, starfish, crab, Lemons, sunscreen, sunglasses, etc., the materials are provided in EPS and PNG formats, including JPG previews.
PNG material
2024-05-09

Four red 2023 graduation badges vector material (AI EPS PNG)

This is a red 2023 graduation badge vector material, four in total, available in AI, EPS and PNG formats, including JPG preview.
PNG material
2024-02-29

Singing bird and cart filled with flowers design spring banner vector material (AI EPS)

This is a spring banner vector material designed with singing birds and a cart full of flowers. It is available in AI and EPS formats, including JPG preview.
banner picture
2024-02-29

Golden graduation cap vector material (EPS PNG)

This is a golden graduation cap vector material, available in EPS and PNG formats, including JPG preview.
PNG material
2024-02-27

Home Decor Cleaning and Repair Service Company Website Template

Home Decoration Cleaning and Maintenance Service Company Website Template is a website template download suitable for promotional websites that provide home decoration, cleaning, maintenance and other service organizations. Tip: This template calls the Google font library, and the page may open slowly.
Front-end template
2024-05-09

Fresh color personal resume guide page template

Fresh color matching personal job application resume guide page template is a personal job search resume work display guide page web template download suitable for fresh color matching style. Tip: This template calls the Google font library, and the page may open slowly.
Front-end template
2024-02-29

Designer Creative Job Resume Web Template

Designer Creative Job Resume Web Template is a downloadable web template for personal job resume display suitable for various designer positions. Tip: This template calls the Google font library, and the page may open slowly.
Front-end template
2024-02-28

Modern engineering construction company website template

The modern engineering and construction company website template is a downloadable website template suitable for promotion of the engineering and construction service industry. Tip: This template calls the Google font library, and the page may open slowly.
Front-end template
2024-02-28