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- How to create a responsive full-screen video background with CSS?
- To create a responsive full-screen video background, you need to use fixed positioning and object-fit properties to ensure that the video covers the entire viewport without distortion; 1. Use position:fixed to fix the video container to the viewport; 2. Maintain the video aspect ratio and cover the container through object-fit:cover; 3. Use z-index:-1 to place the video behind the content; 4. Add autoplay, muted, loop, and playsinline properties to support automatic playback; 5. Provide background images for mobile devices or slow connections as a downgrade solution; 6. Optimize the video file size and format to improve performance, and ultimately achieve cross-device compatible full-screen video background effects.
- CSS Tutorial . Web Front-end 859 2025-08-03 11:40:01
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- How to create a responsive dashboard layout with CSS Grid?
- Define the grid container structure, use display:grid and grid-template-areas to set the header, sidebar and main content area; 2. Change the layout to a single column when the screen width is less than 768px through media query, so that the sidebar is moved to the bottom; 3. Use fr units and minmax() to combine auto-fit to achieve the adaptive flow layout of the main content area card; 4. Add margins, rounded corners and box-sizing to prevent overflow and improve visual effects, and combine grid-auto-rows and named grid lines to optimize the readability of the layout; finally realize a responsive dashboard layout built with no framework and only using CSSGrid.
- CSS Tutorial . Web Front-end 584 2025-08-03 11:37:00
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- Troubleshooting MySQL Disk Full Errors and Prevention
- The steps to solve the problem of MySQL to report disk full are as follows: 1. First, confirm whether the disk is really full, check df-h and df-i, and troubleshoot permissions and /tmp space; 2. Clean the data logs, including deleting expired binlogs, cleaning useless tables, OPTIMIZETABLE to optimize large tables, and enabling compression; 3. Expand or adjust the path, such as adding disks, migrating data directories, and using symbolic links; 4. Preventive measures include regular monitoring, setting up automatic cleaning, using partition tables, and planning capacity reservations. The entire process requires attention to backing up the data and handling permissions and security policy settings.
- Mysql Tutorial . Database 622 2025-08-03 11:33:01
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- How to Use Subqueries Effectively in MySQL?
- Understandthetypesofsubqueries:scalar,row,column,andtablesubquerieseachservespecificpurposesandareusedindifferentclauses.2.Usesubquerieswhenfilteringbasedonaggregatedresults,improvingreadability,orcomputingderivedvalues,butpreferjoinsforbetterperform
- Mysql Tutorial . Database 619 2025-08-03 11:21:01
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- How to check if a table or database exists in MySQL?
- To check whether the database or table exists in MySQL, use the INFORMATION_SCHEMA or SHOW command. 1. Check whether the database exists: Use SELECTSCHEMA_NAMEFROMINFORMATION_SCHEMA.SCHEMATAWHERESCHEMA_NAME='your_database_name'; or SHOWDATABASESLIKE'your_database_name'; 2. Check whether the table exists: Use SELECTTABLE_NAMEFROMINFORMATION_SCHEMA.TABLESWHERET
- Mysql Tutorial . Database 251 2025-08-03 11:19:00
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- HTML `alt` Attribute for Images: Accessibility and SEO
- The alt attribute is crucial for accessibility and SEO. 1. For accessibility, visually impaired users rely on screen readers to obtain picture information. Clear alt descriptions such as "red high heels" are better than blurred content or file names. Decorative pictures should be empty alts to avoid interference. 2. For SEO, alt text helps search engines understand the content of the picture and needs to naturally incorporate keywords, such as "female red high heels, suitable for dinner outfits", to avoid pile up keywords. 3. Common errors include using file names to act as alt, descriptions are blurred, duplicate content, and not updating dynamic picture alt, which affects the experience and optimization effect. Each time you insert a picture, check whether the alt accurately reflects the information, improve user experience and enhance website exposure.
- HTML Tutorial . Web Front-end 427 2025-08-03 11:16:02
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- Refactoring Legacy PHP: A Practical Guide to Eliminating $GLOBALS
- To eliminate $GLOBALS in PHP, it should first analyze its usage and then replace global variables with dependency injection, configuring objects, and step-by-step refactoring. 1. Use grep and other tools to find out all the usage of $GLOBALS and record the key names and locations; 2. Replace global variables such as database connections and configurations with explicit dependencies, such as injecting PDO or Config objects through constructors; 3. Create service classes (such as Logger, UserService) to encapsulate functions to avoid function dependence on global state; 4. Centrally manage the configuration, load from the configuration file returning the array, and inject the required classes; 5. Reconstruct the database in a small way, replacing a $GLOBALS reference at a time, and test to ensure consistent behavior; 6. Beware of including
- PHP Tutorial . Backend Development 698 2025-08-03 11:14:01
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- From Raw Input to Safe Data: The Definitive Workflow for PHP's $_GET Superglobal
- Alwaystreat$\_GETdataasuntrusted;2.Checkiftheparameterexistsusingisset()ornullcoalescing;3.Sanitizebasedonexpectedtype—useFILTER\_VALIDATE\_INTforintegers,htmlspecialchars()forstrings,andFILTER\_VALIDATE\_BOOLEANforbooleans;4.Validateagainstbusinessl
- PHP Tutorial . Backend Development 924 2025-08-03 11:12:01
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- How to handle bidirectional text with the HTML bdi element
- Addresses the correct display of dynamic content in a mixed text orientation environment, which ensures punctuation and neutral characters are rendered correctly by automatically detecting and isolating text in unknown directions. 1. When embedding text with unknown directions in documents with known directions (such as Arabic username in English page), the browser's Unicode bidirectional algorithm may misalign text; 2. Elements enable the browser to automatically judge the internal text direction and isolate it from surrounding content; 3. Applicable to user-generated content, dynamic data and multilingual interfaces; 4. Unlike the dir attributes that require predicting the direction, it has intelligent detection capabilities; 5. All modern browsers support it, IE does not support it but can be processed through a downgrade solution. Therefore, when displaying multilingual content that is not written by yourself, you should use
- HTML Tutorial . Web Front-end 277 2025-08-03 11:11:02
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- What is the async attribute on the HTML script tag
- Theasyncattributeallowsnon-blockingscriptloading,meaningthebrowserdownloadsthescriptasynchronouslywithoutblockingHTMLparsing;oncedownloaded,thescriptexecutesimmediately,potentiallypausingparsingforexecution.1.Useasyncforscriptsthatdon’tdependontheDOM
- HTML Tutorial . Web Front-end 985 2025-08-03 11:09:03
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- Using HTML `input` Types for User Data
- Choosing the right HTMLinput type can improve data accuracy, enhance user experience, and improve usability. 1. Select the corresponding input types according to the data type, such as text, email, tel, number and date, which can automatically checksum and adapt to the keyboard; 2. Use HTML5 to add new types such as url, color, range and search, which can provide a more intuitive interaction method; 3. Use placeholder and required attributes to improve the efficiency and accuracy of form filling, but it should be noted that placeholder cannot replace label.
- HTML Tutorial . Web Front-end 193 2025-08-03 11:07:01
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- From `break` to Functions: A Strategy for Improving Code Testability
- Whenyouseeabreakstatementinaloop,itoftenindicatesadistinctlogicthatcanbeextractedintoafunction;2.Extractingsuchlogicimprovestestabilitybycreatingisolated,single-responsibilityfunctionswithclearinputsandoutputs;3.Thisrefactoringenablesindependentunitt
- PHP Tutorial . Backend Development 448 2025-08-03 10:54:01
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- Troubleshooting MySQL Service Restart Failures
- If the MySQL service restart fails, you need to check the log location reason first, and then handle it in a targeted manner. 1. Check the error information in log files such as /var/log/mysqld.log, such as PID file problems, insufficient permissions or InnoDB errors; 2. Troubleshoot port occupation, use netstat-tulnp|grep3306 to see if the 3306 port is occupied; 3. Fix permission problems, execute the chown and chmod commands to ensure that the mysql user has the right to read and write data directory; 4. Handle PID file exceptions and manually delete old PID files; 5. If the InnoDB file is corrupt, consider recovery mode or backup recovery; 6. Check system resources to confirm that the memory and swap space are sufficient; 7. Check
- Mysql Tutorial . Database 810 2025-08-03 10:43:01
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- How to use the CSS writing-mode property?
- writing-mode controls text flow and is suitable for multilingual support and creative layouts. 1.horizontal-tb is the default value, and the text is arranged left to right, top to bottom; 2. vertical-rl is used in traditional Chinese, Japanese, and Korean, and the text is arranged from top to bottom, and lines from right to left; 3. vertical-lr is used in some Mongolian language, and lines are arranged from left to right. Vertical type can be achieved through .vertical-text{writing-mode:vertical-rl;}. Practical applications include: vertical text in the sidebar or title, keeping the letters upright through text-orientation:mixed; supporting traditional typesetting in East Asian languages; realizing
- CSS Tutorial . Web Front-end 758 2025-08-03 10:41:01
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