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  • Describe attribute selectors in CSS
    Describe attribute selectors in CSS
    The CSS attribute selector locates and styles HTML elements through the attributes and values of the elements, without relying on classes or IDs. 1. You can select elements by whether there is a certain attribute, such as input[type] to select all input boxes with type attributes; 2. You can match exact values, such as input[type="text"] to only act on text input boxes; 3. Support partial matching, including ~= (space separation), |= (hyphen separation), and ^=, $=, *= (substring matching), which is suitable for multi-value attributes and complex condition filtering, but excessive use may affect performance. These selectors are suitable for handling forms, link filtering, image selection and other scenarios, making the structure simpler and requires no JavaScript
    CSS Tutorial . Web Front-end 736 2025-07-16 01:13:11
  • Basic PHP Configuration (php.ini)
    Basic PHP Configuration (php.ini)
    To configure PHP, you need to find and modify the php.ini file. Common methods include using phpinfo() to view the path, enter php-ini or the default directory of the cloud server; common configuration items such as memory_limit is set to 128M or higher, upload_max_filesize and post_max_size are set to 20M and 21M respectively, max_execution_time is changed to 120, development environment display_errors is set to On, production environment is set to Off, date.timezone is set to Asia/Shanghai; when multiple environments, you need to pay attention to the configuration differences of different versions of PHP, and build
    PHP Tutorial . Backend Development 259 2025-07-16 01:05:00
  • Explain the CSS `content` property used with pseudo-elements
    Explain the CSS `content` property used with pseudo-elements
    The content attribute of CSS is mainly used for pseudo-elements such as ::before and ::after, which are used to insert and generate content. 1. Support strings, URLs, counters, attribute values and Unicode characters; 2. ::before insert content at the beginning of the element, ::after at the end; 3. The display effect can be controlled through styles, such as color, font, background, etc.; 4. Pay attention to the fact that empty strings still occupy space, use of escape characters, cannot insert HTML elements, and browser compatibility issues.
    CSS Tutorial . Web Front-end 624 2025-07-16 01:02:41
  • Explain the difference between inline, inline-block, and block display values
    Explain the difference between inline, inline-block, and block display values
    Block-level elements occupy a row and support full width, suitable for full-width buttons or section breaks; elements within the line flow like text, suitable for small segments of text or links; block elements within the line combine the advantages of both, can be sized and arranged horizontally, and are often used for navigation menus or layout layout. The specific use is as follows: 1. Use block to allow the element to occupy a line and fill the width; 2. Use inline to make the element not interrupt the text stream; 3. Use inline-block to achieve horizontal arrangement and control the size and spacing. Mastering these three display types can effectively solve the alignment and arrangement problems in web page layout.
    CSS Tutorial . Web Front-end 300 2025-07-16 01:00:12
  • How does the `white-space` property work?
    How does the `white-space` property work?
    The white-space attribute is used in CSS to control the processing of blank spaces in elements, mainly affecting the display behavior of spaces, tabs and newlines. Common values include: 1.normal (default value, blank collapses into one space, automatic line break); 2.pre (keep all blanks, only line breaks at newlines); 3.nowrap (fold blank but not line breaks); 4.pre-wrap (keep blank, line breaks allow); 5.pre-line (fold blank, line breaks in the source code). When you need to keep the code indent or chat record format, it is recommended to use pre-wrap; for long words or URLs that cause layout overflow, you can combine word-break or overflo
    CSS Tutorial . Web Front-end 800 2025-07-16 00:55:01
  • Describe CSS performance optimization techniques
    Describe CSS performance optimization techniques
    The key to optimizing CSS performance is to reduce complexity, avoid re-arrangement and repainting, and use selectors and structured management styles. 1. Use simple class selectors to avoid over-necking and complex pseudo-class selectors to improve matching speed; 2. Animation prioritizes transformation and opacity to reduce layout attribute changes to avoid expensive rearrangements; 3. Use class switching when batch-modifying styles or remove elements first and then operate to reduce the performance loss caused by frequent redrawing and rearrangements; 4. Simplify CSS files, merge duplicate rules, delete useless code, and use modular naming specifications such as BEM to improve maintainability.
    CSS Tutorial . Web Front-end 914 2025-07-16 00:52:10
  • How to style selection highlighting (`::selection`)?
    How to style selection highlighting (`::selection`)?
    Use the ::selection pseudo-element of CSS to customize the highlighting style when the web page text is selected to improve the aesthetics and unity of the page. 1. Basic settings: define background-color and color through ::selection, such as yellow background with dark gray fonts; specific elements such as p::selection can also be limited. 2. Compatibility processing: Add the -webkit- prefix to be compatible with Safari and mobile browsers, and the Firefox and Edge standards are well supported. 3. Pay attention to readability: Avoid excessive color contrast or too fancy, and should be coordinated with the overall design. For example, choose a soft blue base in dark mode to improve visual comfort. Reasonable use can enhance the texture of the interface, ignore details
    CSS Tutorial . Web Front-end 877 2025-07-16 00:50:50
  • Effective Multiline Commenting in PHP
    Effective Multiline Commenting in PHP
    Yes,PHPsupportsmultilinecommentsusingthe/.../syntax.Towritethem,startwith/andendwith/,ensuringnonestingoccurstoavoiderrors.Theyareusefulfordocumentation,suchasexplainingclassesandmethods,andfordebuggingbytemporarilydisablingcodeblocks.Commonmistakesi
    PHP Tutorial . Backend Development 828 2025-07-16 00:44:40
  • What is the `:empty` pseudo-class?
    What is the `:empty` pseudo-class?
    An element is considered to be:empty when it has nothing (including text, spaces, child elements, or comments). For example, it is empty, but an element containing spaces, children, or comments is not. Common uses include hiding dynamically generated empty containers, assisting form verification, and avoiding unnecessary blank areas in CMS. It should be noted that whitespace characters and comments will prevent the element from being empty, so when using it, make sure that the element is really empty to avoid selection failure.
    CSS Tutorial . Web Front-end 767 2025-07-16 00:42:11
  • How to implement a 'dark mode' toggle using HTML, CSS, and JS?
    How to implement a 'dark mode' toggle using HTML, CSS, and JS?
    How to add a dark mode toggle button to your website? First, use HTML to build the structure, then use CSS to define two theme styles, and finally implement the switching function through JavaScript. 1. Create a basic layout: Create an HTML file containing toggle buttons and content, and link CSS and JS files. 2. Define the theme in CSS: Use variables to set the color scheme of default and dark modes and apply it to page elements. 3. Add JavaScript switching logic: Switch the dark mode class on the body by clicking events, and save user preferences with localStorage.
    HTML Tutorial . Web Front-end 231 2025-07-16 00:39:51
  • PHP's Role in Web Development
    PHP's Role in Web Development
    PHPremainsrelevanttodayduetoitsdominanceincontentmanagementsystemsandcontinuousmodernization.1.Itpowersover70%ofknownserver-sidewebsites,largelybecauseofWordPress.2.PHP8introducedperformanceboostsandfeatureslikeJITcompilation.3.ItexcelsinCMS-drivensi
    PHP Tutorial . Backend Development 748 2025-07-16 00:25:24
  • how to add index to mysql table
    how to add index to mysql table
    The situations where indexing is required include: fields are often used for query conditions, JOIN connection, sorting or grouping; the syntax for adding a single column index is ALTERTABLEtable_nameADDINDEXindex_name(column_name), it is recommended to customize naming and avoid peak operations; combined indexes should ensure that leading columns and fields with high distinction are placed in front, not all multi-conditions are suitable; deleting indexes requires confirmation of dependence on SQL to avoid affecting query performance.
    Mysql Tutorial . Database 958 2025-07-16 00:21:11
  • Explain the different ways to specify colors in CSS (hex, rgb, hsl)
    Explain the different ways to specify colors in CSS (hex, rgb, hsl)
    There are three commonly used color representation methods in CSS: HEX, RGB and HSL. 1. HEX uses six-digit hexadecimal numbers to represent the color, starting with #, such as #FF5733, which is suitable for accurate color matching and easy to copy; 2. RGB controls the color through red, green and blue values, such as rgb (255, 87, 51), which is suitable for dynamic color adjustment and supports transparency settings; 3. HSL defines colors based on hue, saturation and brightness, such as hsl (20, 100%, 60%), which is convenient for adjusting tones and creating a consistent color scheme. Each format has its own advantages, and the choice depends on the specific requirements and usage scenarios.
    CSS Tutorial . Web Front-end 470 2025-07-16 00:14:10
  • Setting Line Length in CSS (and Fitting Text to a Container)
    Setting Line Length in CSS (and Fitting Text to a Container)
    The many ways to juggle line length when working with text... including two proposed properties that could make it easier in the future.
    CSS Tutorial . Web Front-end 918 2025-07-15 09:23:13

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