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  • HTML `em` vs `i` Tag for Emphasis
    HTML `em` vs `i` Tag for Emphasis
    Whether to choose or not depends on whether semantic emphasis is needed. 1. Used to emphasize the tone of the content, suitable for scenes where the focus is conveyed or the stress is reflected in accessible access; 2. Used only for visual italics, such as scientific languages, foreign language vocabulary or book names, without semantic emphasis requirements; 3. If it is only for style control, it is recommended to use CSS instead of mixed labels.
    HTML Tutorial . Web Front-end 735 2025-07-20 02:25:52
  • Structuring Content with HTML `header` and `footer`
    Structuring Content with HTML `header` and `footer`
    Header and footer are semantic tags used in HTML to define the header and bottom of a page, which can improve structural clarity, accessibility and SEO. 1. The header is usually located at the top of the page, including title, navigation bar, etc. It is recommended that each page only uses one main header; 2. Footer is often used to place copyright information, secondary links, etc. It is recommended that each page has at least one main footer, and the content should be concise and clear; 3. Used in combination with semantic tags such as main and section, it can further enhance the page structure and semantic expression.
    HTML Tutorial . Web Front-end 601 2025-07-20 02:09:11
  • Implementing Lazy Loading for Images in HTML
    Implementing Lazy Loading for Images in HTML
    Lazy image loading is an optimization technique that only loads when the user scrolls near the image to improve page speed. The core is to reduce initial requests, which are suitable for most modern browsers, and are implemented through loading="lazy". More flexible control can be used to use IntersectionObserver API. The steps include setting the placeholder map, storing the real path with data-src, and replacing src when entering the viewport; precautions include avoiding lazy loading of the first screen image, considering the impact of SEO, and testing the performance of different devices.
    HTML Tutorial . Web Front-end 592 2025-07-20 02:03:22
  • Understanding HTML `integrity` for Script Security
    Understanding HTML `integrity` for Script Security
    The integrity attribute is a security mechanism in HTML5 that ensures the integrity of external scripts or linked resources. Its function is to prevent resources from being tampered with. 1. It checks the hash value of the resource content by presetting the hash value of the resource after the browser downloads the resource. If it is inconsistent, it will refuse to execute; 2. Use it to prevent malicious code injection caused by CDN hijacking and improves web page security; 3. The generation method is to encrypt and hash the file content and convert it to base64 encoding. It is recommended to use SHA-384 or SHA-512; 4. Notes include: it is not suitable for frequently modified development environments, must be used with crossorigin attributes, supported by mainstream browsers, but IE is incompatible.
    HTML Tutorial . Web Front-end 263 2025-07-20 01:54:51
  • HTML `dir` Attribute for Text Direction
    HTML `dir` Attribute for Text Direction
    The dir attribute is used to control the writing direction of text in HTML elements, and supports two values: ltr and rtl. It is suitable for multilingual websites, especially RTL languages such as Arabic and Hebrew. 1. Basic usage: dir="ltr" is the default value suitable for English and Chinese, dir="rtl" is used in Arabic and other languages that need to be displayed from right to left; 2. Applicable scenarios: The structural level direction control such as the entire page or paragraph, which is more conducive to accessibility than the direction attribute of CSS; 3. Nesting control: After the parent element is set, the child element inherits the direction, and the parent can be covered by setting the child element dir separately to achieve mixed layout such as LTR English embed RTL
    HTML Tutorial . Web Front-end 955 2025-07-20 01:52:32
  • Using HTML `contenteditable` for In-Page Editing
    Using HTML `contenteditable` for In-Page Editing
    The contenteditable attribute realizes the inline editing function of web page elements by setting a boolean value. Pay attention to security and compatibility when using it. The basic usage is to add contenteditable="true" to HTML elements to enable editing, and child elements can be set separately to be non-editable. Common tips include: 1. Listen to blur or input events to save content; 2. Limit input length through JavaScript; 3. Use innerText to clean rich text styles. Possible problems are: security risks caused by user input HTML or scripts, differences in browser compatibility, and complex cursor and selection control. Therefore, in lightweight scenarios such as
    HTML Tutorial . Web Front-end 759 2025-07-20 01:40:12
  • HTML `noscript` Tag Explained
    HTML `noscript` Tag Explained
    Tags are used to display alternative content when JavaScript is disabled or not supported. 1. It can be placed in or in, displaying prompt information as needed. If the user does not enable JS, it will display "Please enable JavaScript"; 2. It is often used in scenarios such as content downgrade, substitute function prompts, advertising control, etc., such as providing static maps or links; 3. Pay attention to SEO influence, style control, and browser compatibility when using it, and avoid placing key content only in it.
    HTML Tutorial . Web Front-end 872 2025-07-20 01:28:22
  • HTML Templating Engines Explained
    HTML Templating Engines Explained
    The function of the template engine is to combine data with page structure to dynamically generate HTML content. It simplifies the organization of front-end code by separating structure and data, and avoids the maintenance problems caused by manual stitching of strings. For example, when there is no template engine, displaying user information requires string splicing, and the logic is complicated and difficult to maintain. Common template engines include JavaScript's EJS, Pug, Handlebars, Python's Jinja2, DjangoTemplates, PHP's Blade, Twig, etc. Although the syntax is different, the core concepts are the same. The template selection engine should consider learning cost, performance, scalability and community activity. Use process is usually: define template files, insert variables, or
    HTML Tutorial . Web Front-end 992 2025-07-20 01:26:51
  • HTML `progress` Element for Loading States
    HTML `progress` Element for Loading States
    The progress element is a native element in HTML5 used to represent the task progress, and the current value and maximum value are defined through the value and max attributes. 1. It is suitable for scenarios where file uploads and data loading require feedback on progress; 2. JavaScript can be used to dynamically update the value to achieve load status display; 3. If the specific progress cannot be obtained, you can not set a value or use animation instead; 4. Support CSS custom styles, but pay attention to browser compatibility differences; 5. Abuse should be avoided when using it, combined with aria-label to improve the barrier-free experience, and consider old browser rollback solutions. The rational use of progress can improve the user experience, especially in long-term loading scenarios.
    HTML Tutorial . Web Front-end 605 2025-07-20 01:26:12
  • HTML `summary` Element Default Styling and Customization
    HTML `summary` Element Default Styling and Customization
    You can modify the style of the tag through custom CSS to adapt to design requirements. By default, the text is bold, and a triangle arrow is displayed on the left. Click to expand/collapse the content, but the display of different browsers is slightly different. To customize the style, you can follow the following steps: 1. Use list-style, font-weight, color and other attributes to adjust the font and color; 2. Hide the default arrows through the ::-webkit-details-marker pseudo-element; 3. Add custom arrow icons using the ::after pseudo-element or background image; 4. Add hover effect and transition animation to improve the interactive experience. It should be noted that ::-webkit-details-marker is only available in We
    HTML Tutorial . Web Front-end 284 2025-07-20 01:22:12
  • HTML `crossorigin` Attribute for Resources
    HTML `crossorigin` Attribute for Resources
    CORS is a cross-domain resource sharing mechanism, while crossorigin is an HTML attribute used to control CORS behavior when resource loading. 1.CORS is a protocol between the server and the browser, allowing cross-domain requests; 2.crossorigin is a front-end tag attribute, which determines whether to enable CORS and its mode; 3. Set crossorigin to obtain detailed error information and avoid security restrictions; 4. Its values include anonymous (default, without credentials), use-credentials (with credentials) and not set (without CORS); 5. The actual use requires the server to cooperate to return the correct response header; 6. It is recommended to select values on demand to ensure security and performance.
    HTML Tutorial . Web Front-end 878 2025-07-20 01:21:32
  • HTML `canvas` Context and Drawing Basics
    HTML `canvas` Context and Drawing Basics
    To use HTML drawing, 1. First get the canvas element through JavaScript and get the 2D context; 2. You must correctly set the width and height of the canvas to avoid blur; 3. Use fillRect, strokeRect and clearRect to draw rectangles; 4. Use beginPath to start the path, combine moveTo, lineTo, arc and other methods to draw complex graphics, and display them with stroke or fill; 5. Set fillStyle, strokeStyle, lineWidth and other attributes to control styles, and support multiple color formats and transparency; 6. Use fillText and strokeText to draw text
    HTML Tutorial . Web Front-end 328 2025-07-20 01:18:32
  • HTML `ins` Tag for Underlined/Added Text
    HTML `ins` Tag for Underlined/Added Text
    To mark new or emphasized text, use tags in HTML. It defaults to underline text, which means that the content was inserted later, suitable for document revisions or version comparisons; it has semantic value unlike labels that are only used for styles; it supports datetime and cite attributes, which can indicate the insertion time and adder information respectively; at the same time, you can customize the style through CSS, such as changing the background color or removing the underscore to better integrate into web design.
    HTML Tutorial . Web Front-end 189 2025-07-20 01:17:52
  • Implementing Responsive `iframe` Elements
    Implementing Responsive `iframe` Elements
    The key to implementing a responsive iframe is to use CSS to control size and proportions, and pay attention to compatibility of third-party content. 1. Use max-width:100% and height:auto to maintain the iframe width adaptive and maintain the proportion; 2. Through the "responsive container" structure, use padding-bottom to set the proportion (such as 16:9) to ensure that the iframe fills the container and the proportion is fixed; 3. Avoid using fixed width and height attributes in the tag, and use CSS instead; 4. Pay attention to the default style of third-party content, appropriately reset CSS and test the display effect under different devices.
    HTML Tutorial . Web Front-end 285 2025-07-20 01:13:41

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