亚洲国产日韩欧美一区二区三区,精品亚洲国产成人av在线,国产99视频精品免视看7,99国产精品久久久久久久成人热,欧美日韩亚洲国产综合乱

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

  • HTML Script Tag: Loading JavaScript Files
    HTML Script Tag: Loading JavaScript Files
    The correct way to introduce JS files using tags is to load external scripts through the src attribute and choose whether to use defer or async attributes according to your needs to optimize loading performance. 1. The basic usage is to use the src attribute to load scripts, such as, but it will block HTML parsing; 2. Use the defer attribute to allow scripts to be executed in order after HTML parsing is completed, suitable for scripts that rely on DOM or sequential requirements; 3. Use the async attribute to make scripts load asynchronously and execute immediately, suitable for independent scripts without dependencies; 4. The scripts should be placed at the end as much as possible, and if defer or async is used, it can be placed in; 5. Practical suggestions include using external files for easy maintenance, key scripts can be inlined, and defer when there is dependency, and no dependency.
    HTML Tutorial . Web Front-end 949 2025-07-22 01:38:21
  • HTML `select` `multiple` Attribute for Multi-Selection
    HTML `select` `multiple` Attribute for Multi-Selection
    To implement the drop-down menu multiple selection function in HTML, 1. Add multiple attribute to the tag; 2. When submitting data, add [] after the name attribute so that the server can receive the array; 3. You can get the selected value through the querySelectorAll or selectedOptions attributes of JavaScript; 4. Pay attention to browser style differences, mobile compatibility and default expansion issues. For example: PHP can receive arrays through $_POST['colors'], and JavaScript can obtain values using Array.from(selectElement.selectedOptions).map.
    HTML Tutorial . Web Front-end 1014 2025-07-22 01:31:52
  • Web Components: Custom Elements in HTML
    Web Components: Custom Elements in HTML
    CustomElements is part of WebComponents, allowing developers to create custom HTML tags and give them behavior and styles. 1. The element name must contain short horizontal lines (kebab-case); 2. Define component behavior by inheriting the HTMLElement class; 3. Register elements with customElements.define(); 4. Can combine ShadowDOM encapsulation styles and structures; 5. Support component development, logical encapsulation and coexist with the framework; 6. Pay attention to naming conflicts, compatibility and life cycle methods, such as connectedCallback and attributeChangedCallback
    HTML Tutorial . Web Front-end 548 2025-07-22 01:23:03
  • Handling Form Submissions in HTML
    Handling Form Submissions in HTML
    The key points of handling HTML form submission are: 1. Use form tags and correctly set the action and method attributes; 2. Select the GET or POST submission method according to the purpose; 3. Ensure that the form field contains the name attribute for data transmission; 4. Use HTML native verification or JavaScript for front-end verification, and be sure to perform secure verification on the server side. These key points can help avoid common problems and ensure that data is submitted correctly and securely to the server.
    HTML Tutorial . Web Front-end 597 2025-07-22 01:12:32
  • The Role of HTML `accesskey` for Accessibility
    The Role of HTML `accesskey` for Accessibility
    accesskey is an attribute in HTML that is used to set element shortcut keys. By specifying such as accesskey="m", users can quickly access the corresponding elements using Alt m or Ctrl Alt m. It can improve web accessibility, especially for keyboard users and visually impaired users, but you need to pay attention to shortcut key conflicts, user ignorance and screen reader compatibility issues. It is recommended to select non-conflict keys, explicitly prompt shortcut keys, and avoid excessive use. Alternatives include using semantic HTML, providing "skip navigation" links, setting up tabindex reasonably, etc. These methods are usually more stable and reliable.
    HTML Tutorial . Web Front-end 530 2025-07-22 01:10:51
  • HTML `popover` API: A Comprehensive Guide
    HTML `popover` API: A Comprehensive Guide
    HTMLpopoverAPI is a native way to implement pop-up function. To use it, please first add a popover attribute to the popup content element, and associate the trigger with the popup box through the popovertarget attribute. The value must match the id of the popup box; secondly, you can use popoverpolicy to control whether the popup box can be displayed again, and popovertargetaction defines the action after the trigger click (show, hide or toggle); finally, you can use CSS to style and animation the popup box, while paying attention to ensuring accessibility and reasonable use of scenarios.
    HTML Tutorial . Web Front-end 798 2025-07-22 01:06:52
  • The Importance of Semantic HTML for Screen Readers
    The Importance of Semantic HTML for Screen Readers
    SemanticHTMLgreatlyenhanceswebaccessibilityforscreenreaderusersbyprovidingclearstructureandmeaning.ScreenreadersrelyonHTMLelementslike,,,andtonavigatepagesefficiently.Properheadinghierarchy(to)allowsskimming,whileskippinglevelsormisusingheadingsconfu
    HTML Tutorial . Web Front-end 476 2025-07-22 00:45:31
  • Content Security Policy (CSP) in HTML
    Content Security Policy (CSP) in HTML
    CSP is a security mechanism in HTML that prevents XSS attacks by restricting web resource loading. It is set by the HTTP response header Content-Security-Policy, which controls which scripts, styles, pictures and other resources can be executed by the browser, thereby preventing malicious code injection; common settings include default-src, script-src, style-src and other instructions; when debugging, you can use the Report-Only mode to observe violations; when going online, the policy should be gradually tightened and the reports should be continuously monitored to ensure security and functions compatibility.
    HTML Tutorial . Web Front-end 281 2025-07-22 00:28:42
  • Implementing Favicons in HTML Documents
    Implementing Favicons in HTML Documents
    Favicon is a small icon for the website that enhances professionalism and user experience. It is usually 16x16 or 32x32 pixels and is displayed in browser tags, bookmark bars and mobile favorites, representing the brand image. To add Favicon, you need to use tags in HTML, such as:, and note that the path, file name and MIME type are correct. Advanced settings include adding multi-size .ico files, PNG icons, AppleTouchIcon and Manifest files to suit different devices. The details that are easy to ignore are: cache problems can be solved by renaming or adding parameters; the server needs to support .ico files; the icon design should be concise and clear; online tools can be used to generate multi-size icons. Doing a good job of Favicon can enhance the website
    HTML Tutorial . Web Front-end 951 2025-07-22 00:17:21
  • Best Practices for HTML Comments
    Best Practices for HTML Comments
    HTML comments should be written because it can improve code readability and maintenance efficiency, especially when teamwork and project structure is complex. Clear comments can indicate the purpose of the block, explain special logic, or remind attention, such as using "" to identify the starting position of the navigation bar to help others quickly understand the code structure. Effective comments should be avoided in general terms and specific functions or backgrounds should be explained, such as the "" prompt is dynamically generated. At the same time, meaningless comments such as "", not embedding entire script code, not writing emotional statements, and regularly cleaning outdated comments to keep the code tidy.
    HTML Tutorial . Web Front-end 246 2025-07-22 00:01:27
  • Understanding HTML `base` Tag for Base URL
    Understanding HTML `base` Tag for Base URL
    Tags are used to uniformly manage references to all relative paths in a webpage. 1. It is usually placed in, specifying the underlying URL through href, affecting the parsing of all relative path resources on the page. 2. You can use the target attribute to uniformly control the link opening method, such as \_blank or \_self. 3. Commonly used to unify resource prefixes, avoid path confusion, and control link behavior. 4. Notes include: only effective for relative URLs, cannot be covered locally, and have a wide range of impacts. They need to be used in a standardized manner in the early stage of the project to prevent maintenance difficulties.
    HTML Tutorial . Web Front-end 947 2025-07-21 03:20:32
  • HTML `th` and `td` Explained: Table Header vs. Data Cell
    HTML `th` and `td` Explained: Table Header vs. Data Cell
    ThedifferencebetweenthandtdinHTMLtablesliesintheirsemanticroles:thdefinesheadercells,whiletddefinesstandarddatacells.1.thlabelscolumnsorrows(e.g.,"Name,""Age")andisstyledboldandcenteredbydefault;italsoimprovesaccessibilitybyhelpin
    HTML Tutorial . Web Front-end 852 2025-07-21 03:05:51
  • The `sandbox` Attribute for HTML Iframes
    The `sandbox` Attribute for HTML Iframes
    The sandbox attribute is a tool in HTML for enhanced security, preventing potential attacks by limiting the behavior of embedded content. It prohibits JavaScript execution, submitting forms, pop-up new windows, and accessing parent page DOM or cookies by default; when using it, you can open permissions as needed by adding allow-same-origin, allow-scripts and other parameters. Common application scenarios include embedding user content, display ads, online code demonstrations, and protecting privacy data. Notes include not relying on it as the only line of defense, permissions should be strictly controlled, and browser compatibility and behavioral impacts should be paid attention to.
    HTML Tutorial . Web Front-end 255 2025-07-21 03:04:31
  • HTML `picture` Element for Art Direction
    HTML `picture` Element for Art Direction
    The picture element is used in ArtDirection scenarios in responsive web design, and pictures with different compositions are displayed according to different devices. 1. It is implemented by including multiple sources and an img element. The browser selects the appropriate picture according to the media attributes; 2. The desktop can display wide pictures, the tablet can use cropped pictures, and the mobile terminal can be a vertical close-up; 3. When using it, please note that the source order and number are controlled between 2 and 3, and the image format such as WebP can be specified; 4. The img tag is the necessary default fallback option.
    HTML Tutorial . Web Front-end 558 2025-07-21 02:59:51

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