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- How to use HTML progress element for task completion bars
- Use HTML elements to create semantic and accessible progress bars. 1. The basic syntax includes value (current progress) and max (total progress), if it means 30% completion; 2. The value is omitted and displayed as an animation bar with uncertain progress; 3. It can be used for scenes such as form filling or file upload, and dynamically update progress through JavaScript; 4. Support cross-browser style customization of CSS pseudo-elements, such as ::-webkit-progress-value and ::-moz-progress-bar; 5. Note that it is suitable for quantifiable tasks and cannot be used in scenarios such as instruments or disk usage, and elements should be used instead. This element is accessible by default and is recommended when real-time feedback is required and styled
- HTML Tutorial . Web Front-end 305 2025-08-02 04:17:01
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- Troubleshooting MySQL Performance Degradation After Updates
- MySQL performance slows down after updates, usually caused by configuration resets, execution plan changes, resource bottlenecks, or lock contention. 1. Check whether the configuration is reset, focus on parameters such as innodb_buffer_pool_size, max_connections, etc.; 2. Analyze the changes in the query execution plan, use EXPLAIN and ANALYZETABLE; 3. Check the slow query log to locate bottlenecks, use tools to analyze the log to find time-consuming queries; 4. Check the system resource usage, pay attention to CPU, memory, and disk IO; 5. Check the InnoDB status and lock waiting situation to confirm whether there is transaction blockage.
- Mysql Tutorial . Database 519 2025-08-02 04:12:01
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- Juggling Multiple Variables within a Single PHP For Loop
- You can use multiple variables to iterate simultaneously in PHP's for loop. 1. Declare multiple variables in the initialization and incremental part of the for loop by commas, such as for($i=0,$j=10;$i
- PHP Tutorial . Backend Development 498 2025-08-02 04:08:01
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- How to create a disabled input field in an HTML form
- TocreateadisabledinputfieldinHTML,addthedisabledattributetotheinputelement;thispreventsuserinteractionandexcludesthefield’svaluefromformsubmission,asshownintheexamplesprovided,and2.unlikethereadonlyattribute,whichallowsfocusandincludesthevalueinsubmi
- HTML Tutorial . Web Front-end 786 2025-08-02 04:01:02
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- How to style a button with CSS?
- TargetbuttonsusingCSSselectorslikeelement,class,orID;2.Optionallyremovedefaultbrowserstylesforacleanstart;3.Enhanceinteractivitywithhover,focus,andactivestates;4.Customizeappearanceincludingsize,shape,andtypography;5.UseCSSvariablesforconsistentandma
- CSS Tutorial . Web Front-end 953 2025-08-02 03:59:01
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- How to use the CSS hyphens property?
- To correctly use the hyphens attribute of CSS to achieve the hyphen effect when text line breaks, the following steps must be followed: 1. Set hyphens:auto to enable automatic word breaking; 2. Make sure that the lang attribute (such as lang="en") is specified in the HTML so that the browser can apply the correct language word breaking rules; 3. To be compatible with different browsers, use manufacturer prefixes such as -webkit-hyphens:auto and -moz-hyphens:auto; 4. The container must have a restrictive width to trigger line breaking; 5. For precise control, you can use to insert soft hyphens and set hyphens:manual; 6. Pay attention to Chinese,
- CSS Tutorial . Web Front-end 409 2025-08-02 03:54:01
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- HTML `template` Element for Reusable Content
- It is a native element in HTML that defines a reusable structure. The content is not displayed by default. The DOM needs to be inserted through JavaScript. Its core uses include: 1. Store reusable HTML fragments; 2. Support browser parsing internal structures, which are different from script tags; 3. Applicable to dynamically generate lists, component development, and reduce network requests; 4. Can be used to build encapsulated components with ShadowDOM; 5. Multi-page reuse can be introduced through iframe, JS or build tools.
- HTML Tutorial . Web Front-end 150 2025-08-02 03:52:02
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- Implementing MySQL Multi-Source Replication
- MySQL multi-source replication requires attention to version support, multi-main library connection configuration, replication process management and data conflict handling. ①MySQL 5.7 or higher must be used, 8.0 is recommended; ② Establish an independent replication channel (Channel) for each master library to ensure that the name is unique, the network is accessible, and the permissions are correct; ③ Use STARTSLAVE or a designated channel to start replication, and regularly check the Seconds_Behind_Master to monitor the synchronization status; ④ Avoid multiple masters writing to the same table, set self-increasing offset, and control the write path through the application layer to reduce conflicts; ⑤ Check the log and process it in time when an error occurs.
- Mysql Tutorial . Database 903 2025-08-02 02:32:00
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- MySQL Auto-Increment Handling and Best Practices
- MySQL auto-increment field (Auto-Increment) is used to automatically assign unique values and is often used in primary key design. 1. The self-increment field may skip the number, reasons include insertion failure, transaction rollback, batch insertion partial failure, master-slave replication delay, or recalculating the starting value after MySQL restart. 2. If the value-added is set improperly, it may cause overflow. For example, TINYINT only supports 127 records at most. It is recommended to select INTUNSIGNED or BIGINT based on the data size. 3. There may be self-increasing conflicts in master-slave replication, which can be resolved by setting step offset, using UUID, or writing to the master library in a unified manner. Other precautions include avoiding manual intervention in self-increase fields, regularly checking self-increase status, and doing business logic without relying on self-increase order.
- Mysql Tutorial . Database 763 2025-08-02 02:21:00
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- How to create a gradient border with CSS?
- To implement CSS gradient borders, you need to use a workaround because border does not directly support gradients; 1. Use background-clip:border-box and combine transparent borders and padding to make the background gradients appear in the border area; 2. Use ::before or ::after pseudo-elements to create an absolutely positioned gradient layer and place it on the bottom layer, suitable for animations and rounded corners; 3. border-image can directly apply gradient borders, with simple syntax but limited support for rounded corners; recommended to choose according to requirements: background-clip is preferred for compatibility, pseudo-elements for rounded corners or animations, border-image is used for simple scenes, and the final effect can seamlessly simulate gradient borders.
- CSS Tutorial . Web Front-end 382 2025-08-02 02:16:01
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- Optimizing Large-Scale Array Update Operations for Memory and Speed
- Tooptimizelarge-scalearrayupdates:1.Mutatearraysinplaceinsteadofcreatingcopiesusingspreadorconcattoreducememoryusage;2.Batchupdatestominimizefunctioncalloverhead,pre-allocatearrayswhensizeisknown,andchunklargeinsertionstoavoidcallstacklimits;3.Usetyp
- PHP Tutorial . Backend Development 884 2025-08-02 02:08:00
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- What is the difference between HTML div and span
- A div is a block-level element for layout and structure; a span is an inline element for styles and operations of text or inline content. 1. When using div, it is suitable for wrapping large chunks of content, creating layout containers, and applying full-width styles; 2. When using span, it is suitable for modifying some text, in-line styles or JavaScript operations in sentences. Both have no semantic meanings, mainly serve styles and scripts, and can change the display mode through CSS, but the default behavior should be followed to ensure clear and accessible code. In short, structural block containers are divs, and small-scale wrapping within texts are spans.
- HTML Tutorial . Web Front-end 663 2025-08-02 01:48:02
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- The Inherent Security Risks of Using PHP's $_REQUEST Superglobal
- UsingPHP’s$_REQUESTsuperglobalintroducessecurityrisksbecauseitcombinesinputfrom$_GET,$_POST,and$_COOKIE,leadingtounpredictablebehavior;2.Itallowsunintendedinputsourcestooverrideintendedones,suchasamaliciouscookietriggeringadeleteactionmeanttocomefrom
- PHP Tutorial . Backend Development 692 2025-08-02 01:30:00
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- Navigating PHP Arrays with For Loops: When It Outshines Foreach
- Useaforloopinsteadofforeachwhendirectindexcontrolisneeded,suchasskippingelementsormanipulatingtheindexmanually.2.Forlargenumericallyindexedarrays,forloopsaremoreefficientbecausetheyavoidtheoverheadofPHP’sinternalpointerandkey-valueunpacking.3.Whenmod
- PHP Tutorial . Backend Development 389 2025-08-02 01:19:00
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