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- How to create a pre-selected option in an HTML dropdown menu
- To create pre-selected options in the HTML drop-down menu, you need to add a selected attribute in the target tag; for example, Banana will make "Banana" selected by default when the page is loaded; 1. Only one option should contain a selected attribute (unless it is a multiple-select drop-down box); 2. Selected is a Boolean attribute, which can be effective as long as it exists, without assignment; 3. If there is no selected attribute, the browser usually selects the first option by default; 4. It can be dynamically pre-selected based on user data in combination with JavaScript (such as setting value) or server language; 5. This method is simple and natively supported, suitable for static and dynamic scenarios.
- HTML Tutorial . Web Front-end 181 2025-08-02 05:27:02
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- How to use CASE statements in MySQL for conditional logic?
- CASEstatementsinMySQLprovideconditionallogicinSQLqueries,withtwoforms:searchedCASEformultipleconditionsandsimpleCASEformatchingasingleexpressionagainstvalues;2.SearchedCASEisusedtocategorizedatabasedonconditions,suchasassigningcustomertiersbyspending
- Mysql Tutorial . Database 848 2025-08-02 04:44:01
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- How to build a simple HTML page from the ground up
- Setupatexteditorandbrowser,createaprojectfolder.2.Createindex.htmlwiththebasicHTML5structureincludingdoctype,html,head,andbodytags.3.Addcontentlikeheadings,paragraphs,lists,links,andimageswithinthebody.4.Savethefileandopenitinabrowsertoviewchanges.5.
- HTML Tutorial . Web Front-end 577 2025-08-02 04:38:02
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- Designing MySQL Databases for E-commerce Product Catalogs
- The design of e-commerce product catalog databases requires attention to clear structure, strong scalability and high query efficiency. 1. The core table includes products, categories, product_categories, attributes, attribute_values, product_attributes, inventory, and prices to ensure flexible data management; 2. Multiple SKUs are stored independently through skus tables, associate products and record inventory, prices and attribute combinations to improve management efficiency; 3. Classification adopts closure table structure, and category_closure table storage hierarchical relationships to optimize read performance; 4. Attribute expansion adopts EAV
- Mysql Tutorial . Database 890 2025-08-02 04:36:01
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- How to create a sticky table header with CSS?
- To create a sticky table header, use position:sticky; 1. Use a standard table structure to include head and tbody; 2. Set position:sticky, top:0, background color and z-index for headth; 3. Set tbody to display:block and set fixed height and overflow-y:auto for independent scrolling; 4. It is recommended to use table-layout:fixed to keep the column width consistent; 5. Make sure that the parent container has no overflow:hidden to avoid cutting sticky headers. This method allows the header to always be fixed at the top of the viewport when the page is scrolling.
- CSS Tutorial . Web Front-end 119 2025-08-02 04:28:01
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- How to create a responsive sidebar with CSS?
- Use HTML and CSS to create responsive sidebars; 2. The desktop side is laid sidebars with content through Flexbox; 3. The mobile side sets the sidebars to vertical stacking or hidden sliding display through media queries; 4. Optionally, the mobile menu switching can be achieved through the checkbox hack; 5. Key tips include using modern layout technology, multi-device testing and ensuring accessibility, and ultimately implementing adaptive sidebar design without frameworks.
- CSS Tutorial . Web Front-end 513 2025-08-02 04:23:00
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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 300 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 513 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 487 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 783 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 948 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 404 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 143 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. ①M(fèi)ySQL 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 901 2025-08-02 02:32:00
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