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  • Understanding HTML `formaction` Attribute
    Understanding HTML `formaction` Attribute
    Formaaction is an attribute in an HTML form that specifies the independent submission address of a specific submission button, which overrides the form's default action attribute. 1. It allows setting different submission paths for different buttons, such as "Save" and "Preview". 2. When using it, it is directly added to the button of type="submit", and the syntax is format="url". 3. It can be used in combination with other attributes such as formmethod, formctype, and formtarget to achieve flexible submission behavior. 4. The priority of this property is higher than the action of the form, and the path can be a relative or absolute path. 5. Commonly used for many
    HTML Tutorial . Web Front-end 719 2025-07-24 02:53:42
  • Using `target='_blank'` Safely in HTML
    Using `target='_blank'` Safely in HTML
    When using target="_blank", rel="noopener" must be added at the same time to prevent security vulnerabilities. The reason is that the new page can control the original page through window.opener, causing phishing or redirecting attacks. The correct way to write it is:. If you need to affect SEO, you can add nofollow: rel="noopenernofollow". Scenarios that need special attention include: 1. User-submitted links; 2. Content generated by third-party plug-ins or CMS; 3. Advertising or cooperative links. In addition, target="_blank" should be used with caution,
    HTML Tutorial . Web Front-end 829 2025-07-24 02:52:51
  • HTML Geolocation API Basics
    HTML Geolocation API Basics
    GeolocationAPI obtains user location information through navigator.geolocation.getCurrentPosition() method, which requires user authorization and support HTTPS. First, check whether the browser supports the API; second, call getCurrentPosition() to obtain location information and handle possible errors; finally, develop in combination with actual application scenarios such as weather, maps, etc. When using it, you should pay attention to permission control, privacy protection, equipment differences and compatibility issues.
    HTML Tutorial . Web Front-end 202 2025-07-24 02:47:52
  • HTML Document Structure Explained
    HTML Document Structure Explained
    There are 4 key parts of HTML document structure that must be mastered: 1. The most basic structure contains three core tags, which carry the entire document, metadata and user-visible content respectively; 2. The declaration must be placed at the beginning to avoid the browser from entering weird mode; 3. HTML5 semantic tags such as , can improve accessibility and SEO effects; 4. Although nested structures and indent specifications do not affect operation, they can improve code readability and reduce errors.
    HTML Tutorial . Web Front-end 431 2025-07-24 02:31:22
  • Doctype Declaration in HTML: Why It Matters
    Doctype Declaration in HTML: Why It Matters
    1. You must add a declaration at the beginning of the HTML document, otherwise the browser will enter a weird mode, resulting in layout disorder, style failure, and script errors; 2. Different HTML versions of Doctype write differently, and HTML5 is recommended to use concise; 3. Correct use of Doctype can improve SEO optimization and cross-browser compatibility, ensure clear page structure and consistent rendering, and avoid mobile adaptation problems.
    HTML Tutorial . Web Front-end 555 2025-07-24 02:30:01
  • Creating Dropdown Menus with HTML `select` and `option`
    Creating Dropdown Menus with HTML `select` and `option`
    The Dropdown menu is implemented through HTML select and option elements. The basic structure uses multiple options to wrap multiple options, and the default values can be pre-selected; the options can be grouped and coordinated to improve accessibility; the option's value attribute determines the submission of data, and supports the interaction such as disabled and required attributes. The construction methods of the Dropdown menu include: 1. Use select and option to define the drop-down content; 2. Set the default options through the selected attribute; 3. Use optgroup to classify options; 4. Use label to enhance accessibility; 5. Use value attribute to control the submission value; 6. Use disabled and requ
    HTML Tutorial . Web Front-end 568 2025-07-24 02:29:01
  • Understanding Character Sets in HTML
    Understanding Character Sets in HTML
    The garbled code on the web page may be a character set error. The role of the character set is to tell the browser which way to decode the web page content. If the settings are wrong, it will cause garbled code and affect SEO and user experience. HTML5 is recommended to add it to set the character set and should be placed near the beginning of the document. Old websites may use GBK encoding, but they are no longer recommended. Incorrect character set settings may cause Chinese to display as question marks or garbled codes, and search engines may not recognize the content. The server side also needs to set a character set, such as the Content-Type field in the HTTP header, which is more important in dynamic pages. The HTML file storage encoding must be consistent with the declaration, otherwise an error may still occur. UTF-8 is recommended when it comes to multilingual content. W3CValidat
    HTML Tutorial . Web Front-end 242 2025-07-24 02:25:32
  • HTML `link` for Preconnecting to Origins
    HTML `link` for Preconnecting to Origins
    Use preconnect to establish connections to critical resources in advance, thereby optimizing web page loading speed. Specifically, it reduces the delay in subsequent requests by allowing the browser to handle DNS queries, TCP handshakes, and TLS negotiations in advance. When using it, you should only target external domain names that will be used, and give priority to high-priority resources. At the same time, dns-prefetch can be used to reduce overhead. In addition, cross-domain requests need to add crossorigin attributes, and abuse should be avoided to avoid affecting the loading of the main site resources. Finally, it is recommended to use tools to test and verify the effect.
    HTML Tutorial . Web Front-end 510 2025-07-24 02:04:51
  • HTML `option` `value` and `label` Attributes
    HTML `option` `value` and `label` Attributes
    value is the data sent when the form is submitted, and label is the text the user sees in the drop-down menu. If the label is not specified, the browser will use the text content of option; the label can be used to separate the displayed text from the submitted value, which is suitable for multilingual, concise value or auxiliary technology scenarios; most modern browsers support label, but compatibility still needs to be paid attention to; value decides to submit data, and be sure to ensure that it meets the expectations of the backend; practical suggestions include: using label as needed to improve user experience, check value and label when generating options dynamically, avoid duplicate content, and consider barrier-free support.
    HTML Tutorial . Web Front-end 316 2025-07-24 01:54:02
  • HTML `math` Tag for Mathematical Formulas (MathML)
    HTML `math` Tag for Mathematical Formulas (MathML)
    MathML is an XML-based markup language designed specifically for describing mathematical formulas in HTML. It embeds web pages through tags and supports native display of mathematical expressions. For example, the root formula for quadratic equations can be represented by MathML structured tags. To use MathML in web pages, insert tags and use their specific syntax, while paying attention to browser compatibility (such as Chrome 109 support), rendering differences, or introducing MathJax to improve compatibility. Compared with LaTeX, MathML has its advantages in clear semantics, native support for barrier-free access and easy to program processing, but its complex writing and compatibility historical issues limit popularity. When debugging MathML display problems, you should check the browser support status and DOC
    HTML Tutorial . Web Front-end 285 2025-07-24 01:52:42
  • HTML Security Vulnerabilities and Prevention
    HTML Security Vulnerabilities and Prevention
    Front-end security issues mainly include XSS attacks, unsafe forms and jump links, third-party resource risks and unsafe tag attribute use. 1. XSS attack steals user information by injecting malicious scripts. Prevention methods include input escape, using modern frameworks, setting CSP, and avoiding direct insertion of HTML; 2. Forms and jumps may cause phishing or CSRF, and must be fixed to submit addresses, use whitelists, add CSRFToken and set rel attributes; 3. Third-party resource risks can be prevented through SRI verification, trusted source loading, CSP restrictions and regular inspections; 4. Unsafe tags such as iframes, bases, etc. may cause hijacking, and JavaScript protocols, use sandbox attributes and strictness should be avoided.
    HTML Tutorial . Web Front-end 463 2025-07-24 01:49:32
  • Optimizing HTML for SEO with Meta Tags
    Optimizing HTML for SEO with Meta Tags
    MetatagsareessentialforSEOandshouldbeoptimizedproperly.1.Usetherighttitletagbymakingitconcise,descriptive,andkeyword-rich,ideallyunder60characters.2.Don’tskipthemetadescription;keepitcompelling,relevant,andwithin150–160characterstoimproveclick-throug
    HTML Tutorial . Web Front-end 500 2025-07-24 01:42:41
  • Shadow DOM Concepts and HTML Integration
    Shadow DOM Concepts and HTML Integration
    ShadowDOM is a technology used in web component technology to create isolated DOM subtrees. 1. It allows the mount of an independent DOM structure on ordinary HTML elements, with its own styles and behaviors, and does not affect the main document; 2. Created through JavaScript, such as using the attachShadow method and setting the mode to open; 3. When used in combination with HTML, it has three major features: clear structure, style isolation and content projection (slot); 4. Notes include complex debugging, style scope control, performance overhead and framework compatibility issues. In short, ShadowDOM provides native encapsulation capabilities for building reusable and non-polluting UI components.
    HTML Tutorial . Web Front-end 815 2025-07-24 01:39:02
  • Hyperlinks in HTML: The `` Tag Explained
    Hyperlinks in HTML: The `` Tag Explained
    Tags in HTML are the core tools for creating web page hyperlinks, which are used to jump pages, locate content, send emails, etc. 1. Basic usage: specify the target address through the href attribute, and support relative paths and absolute paths; 2. Jump within the page: Use #id to implement anchor positioning to improve user experience; 3. Multi-functional applications: support mailto: sending emails, tel: dialing, downloading files; 4. Opening a new window: Combining target="_blank" and rel="noopener" to ensure security. Mastering these key points allows you to flexibly control web navigation behavior.
    HTML Tutorial . Web Front-end 708 2025-07-24 01:21:42

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