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  • When should you use semantic html tags instead of generic divs?
    When should you use semantic html tags instead of generic divs?
    Semantic HTML tags should be used instead of common divs to improve accessibility, SEO and code maintenance. ① Semantic tags such as nav and article help screen readers identify content structure; ② Header, footer, main, etc. define page areas and enhance search engine understanding; ③ Aside and section are used to organize relevant but non-core content; ④ Figure and figcaption combine to optimize media description; ⑤ Use div when there is no suitable semantic tag or only layout is required.
    HTML Tutorial . Web Front-end 557 2025-07-13 01:16:12
  • 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 315 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 778 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 181 2025-07-13 01:06:51
  • how to convert a string to a php array
    how to convert a string to a php array
    To convert a string to a PHP array, you need to select the method according to the format: 1. Use exploit() to separate the comma and use array_map(trim) to remove spaces; 2. Use json_decode($str,true) to parse; 3. Use parse_str() to convert the associative array to the URL parameters; 4. Complex structures combine functions such as preg_split() and exploit() to process key-value pairs. Different formats correspond to different conversion strategies, and the key is to identify the string structure.
    PHP Tutorial . Backend Development 287 2025-07-13 01:05:41
  • 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 837 2025-07-13 01:00:31
  • Adding spacing between grid items using css gap property
    Adding spacing between grid items using css gap property
    When using CSSGrid layout, the easiest and most effective way is to use the gap attribute to add spacing between grid items. Gap is an abbreviation property for setting row-gap and column-gap at the same time. For example, .grid-container{display:grid;gap:20px;} can set a 20px spacing for all adjacent grid items; if you need to set it separately, you can use gap:10px20px;. Notes include: 1. The parent container must be set to grid layout; 2. The gap does not affect the margins; 3. Good compatibility but old browsers may need to be prefixed. Common problems and solutions are: 1. The container is not correctly set to grid layout, and it should be checked
    CSS Tutorial . Web Front-end 866 2025-07-13 00:58:11
  • mysql auto_increment reset
    mysql auto_increment reset
    To reset the starting value of the MySQL self-increment field, you can set the AUTO_INCREMENT value through ALTERTABLE, clear the table and reset it with TRUNCATE, or manually set it after DELETE; you can check the current self-increment value and execute SHOWCREATETABLEyour_table_name; information similar to AUTO_INCREMENT=100 will be displayed in the output; when setting manually, make sure that the setting value is the current maximum ID 1, otherwise MySQL will automatically adjust; TRUNCATE will delete data and reset the self-increment value, but DELETE will not; be careful that the actual maximum ID 1 may be restored after the InnoDB engine restarts to avoid conflicts caused by too small settings.
    Mysql Tutorial . Database 132 2025-07-13 00:56:00
  • 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 133 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 662 2025-07-13 00:50:31
  • Styling custom cursors with CSS cursor property
    Styling custom cursors with CSS cursor property
    The method of setting a custom cursor in CSS is simple and practical. 1. Use the cursor attribute to support built-in styles (such as pointer, text) or image paths (such as .cur or .png); 2. It is recommended to use the .cur format and control the image size to within 32x32 or 48x48 pixels to optimize performance; 3. You can specify the hot spot position through coordinate points and set alternative cursors to ensure compatibility; 4. Pay attention to the problem that Safari has limited support for .curr, cursor images cannot be loaded across domains, and some devices may ignore custom cursors. Rational use can enhance the visual style, but it should not be relied on to convey key functions.
    CSS Tutorial . Web Front-end 824 2025-07-13 00:49:50
  • 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 426 2025-07-13 00:35:42
  • Understanding CSS Flexbox properties and layout
    Understanding CSS Flexbox properties and layout
    Flexbox is a layout mode of CSS, suitable for alignment and distribution of one-dimensional space. 1. Create a Flex container through display:flex, and the child elements will automatically become elastic items, which are arranged in a row by default; 2. Use flex-direction to set the spindle direction (such as row or column); 3. Justify-content controls the alignment on the spindle (such as center and space-between); 4. Align-items controls the alignment on the cross axis (such as center and stretch); 5. flex-wrap allows project line breaks; 6. flex-grow, flex-shrink and
    CSS Tutorial . Web Front-end 241 2025-07-13 00:32:51
  • How to fix PHP header already sent error
    How to fix PHP header already sent error
    The error "Cannotmodifyheaderinformation-headersalreadysent" is because there is already output of content before trying to modify the header in PHP. 1. Check whether there are spaces or line breaks at the beginning of the PHP file to ensure that the label and the blank spaces after it are used; 4. Check whether the included files have introduced unexpected output, and you can use the ob_start() buffer to control the output.
    PHP Tutorial . Backend Development 293 2025-07-13 00:32:32

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