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  • Describe the `:has()` pseudo-class (Parent selector)
    Describe the `:has()` pseudo-class (Parent selector)
    The:has()pseudo-classinCSSallowstargetingaparentelementbasedonitschildelements.Itworksbyusingthesyntaxparent:has(child-selector)toapplystylesconditionally.Forexample,div:has(img)appliesstylestoadivcontaininganimage.Multipleselectorscanbeusedwithcomma
    CSS Tutorial . Web Front-end 627 2025-07-15 00:32:40
  • Implementing custom CSS fonts on a website
    Implementing custom CSS fonts on a website
    Correctly loading custom fonts requires @font-face declaration and pay attention to format compatibility, path and CORS settings. 1. Use @font-face to define the font name, source and style; 2. Provide both .woff2 and .woff formats to ensure browser compatibility; 3. Set correct cross-domain headers to solve external loading problems; 4. Verify the font file path to avoid 404 errors; in terms of performance optimization, 5. Load the font weight on demand to reduce requests; 6. Generate subsets of fonts to reduce volume; 7. Use font-display:swap to avoid text invisibility; Common problems include cache old files → clear cache to view, file path error → check Network panel, inconsistent spelling → check font-fam
    CSS Tutorial . Web Front-end 428 2025-07-15 00:28:21
  • How do you create multi-column layouts with CSS?
    How do you create multi-column layouts with CSS?
    Multi-column layouts can be easily created with CSSGrid and Flexbox. 1. CSSGrid is suitable for designs that require precise control of rows and columns. It defines column widths through grid-template-columns, such as 1fr1fr1fr1fr, or uses auto-fit to realize responsive automatic line wrapping; 2. Flexbox is suitable for linear layout, implements equal width columns through display:flex and flex:1, and supports gap control spacing; 3. Responsive design can achieve column number changes under different screen sizes through media query or repeat (auto-fit, minmax()). The combination of the two is better.
    CSS Tutorial . Web Front-end 413 2025-07-15 00:23:41
  • What is the Difference Between `include` and `require` in PHP?
    What is the Difference Between `include` and `require` in PHP?
    In PHP, the main difference between include and require is the way in which files are handled. When using include, if the file does not exist, a warning will be generated (E_WARNING), but the script will continue to be executed; when using require, if the file does not exist, a fatal error will be caused (E_COMPILE_ERROR), and the script will be stopped immediately. Therefore, 1. For non-critical files such as templates or optional components, include should be used; 2. For critical files such as configuration files or core libraries, require must be used to avoid subsequent errors. In addition, to prevent repeated introduction, include_once and require_once can also be used. A common mistake is to
    PHP Tutorial . Backend Development 267 2025-07-15 00:17:01
  • What is the significance of the `final` keyword in php classes and methods?
    What is the significance of the `final` keyword in php classes and methods?
    In PHP, the final keyword is used to restrict inheritance and method rewriting. 1. Classes declared as final cannot be inherited to ensure that their logic is not modified; 2. Final methods cannot be rewritten by subclasses to maintain the consistency of core behavior; 3. Applicable to scenarios such as protecting the core components of the framework, implementing design patterns that do not allow extensions, and improving code readability, but excessive use should be avoided to retain the necessary flexibility.
    PHP Tutorial . Backend Development 869 2025-07-15 00:14:11
  • Describe the Flexbox layout model
    Describe the Flexbox layout model
    A Flex container is a layout container created by setting display:flex or inline-flex. 1. Set the display attribute to flex or inline-flex to create a Flex container; 2. The direct child elements of the container automatically become Flex sub-items; 3. The default child elements are arranged horizontally, without manually setting inline-block or floating; 4. The spindle is default to the horizontal direction, and the cross axis is default to the vertical direction; 5. The spindle direction can be changed through flex-direction; 6. Use justify-content to control the spindle alignment; 7. Use align-items to control the cross axis alignment; 8.
    CSS Tutorial . Web Front-end 895 2025-07-15 00:12:32
  • Describe the `list-style` property
    Describe the `list-style` property
    list-style is abbreviation attribute in CSS for controlling the pre-marking style of list items. 1. You can set the list-style-type, list-style-position and list-style-image at the same time; 2. By default, unordered lists use disc styles, and ordered lists use numeric numbers; 3. Support setting types, positions and pictures, and specify backup styles to deal with image loading failures; 4. In actual development, the default styles are often cleared to ensure consistency, and pay attention to text indentation and image loading issues.
    CSS Tutorial . Web Front-end 227 2025-07-15 00:06:21
  • Explain how to create custom list styles using CSS
    Explain how to create custom list styles using CSS
    Tomakelistsstandoutinwebdesign,useCSStechniquesinthefollowingorder:1)Uselist-style-typeforbasicchangeslikeswitchingbulletsornumberingstyles;2)Replacebulletsentirelywithlist-style-imagetousecustomiconsorimages;3)Stylemarkersmanuallyusing::beforepseudo
    CSS Tutorial . Web Front-end 823 2025-07-15 00:04:11
  • Using the CSS calc() function for dynamic values
    Using the CSS calc() function for dynamic values
    Using CSS's calc() function, you can perform mathematical operations in a style sheet without JavaScript. 1. It can be used to mix different units (such as px and vh) to achieve layout adjustment, such as setting the height of the main content area to the viewport height minus the fixed head height; 2. By combining the viewport units to realize responsive spacing, reducing the use of media queries, such as the container's margins change with the screen width; 3. Support dynamic positioning elements, such as centering the prompt box or adjusting the margins of the main content area according to the sidebar width. calc() is syntax friendly and has good compatibility, and is suitable for a variety of scenarios where flexible values are required.
    CSS Tutorial . Web Front-end 826 2025-07-14 03:10:51
  • Sass vs vanilla CSS tutorial for developers
    Sass vs vanilla CSS tutorial for developers
    It is worth learning Sass because it can significantly improve the efficiency and maintenance of style development. 1. The variable system is more intuitive and supports multiple data types, which facilitates the unified management of style values such as colors and fonts; 2. Nested syntax reduces duplicate selectors to make the structure clearer; 3. Mixins and functions improve style reuse capabilities and simplify complex tasks such as responsive design; 4. Compilation process needs to be configured, but modern tools are well supported. Suitable for medium and large projects, team collaboration and scenes that require theme switching.
    CSS Tutorial . Web Front-end 390 2025-07-14 03:10:30
  • How to select a parent element using CSS Selectors?
    How to select a parent element using CSS Selectors?
    CSS cannot directly select the parent element, but the target effect can be achieved indirectly with a specific selector through structural understanding. 1. Use the :has() pseudo-class (experimental) to select the parent element according to whether the child element exists, such as .container:has(.special); 2. Manually add specific class names to the parent element to achieve style control; 3. Use JavaScript to dynamically judge and add class names to respond to changes in the state of the child element.
    CSS Tutorial . Web Front-end 953 2025-07-14 03:10:10
  • Responsive typography with clamp() CSS tutorial
    Responsive typography with clamp() CSS tutorial
    clamp() is a function used in CSS to create responsive typesetting, allowing the definition of minimum, preferred and maximum values, and the syntax is clamp(MIN, VAL, MAX); for example, font-size: clamp(16px, 2vw 1rem, 24px) indicates that the font size changes with the viewport but limits the range; the recommended writing method is h1{font-size: clamp(1.5rem, 5vw, 3rem);} to ensure readability under different screens; in addition to fonts, it can also be used for line-height, padding, margin, width and other attributes; such as p{padding-inline: clamp(1rem, 5%, 2rem
    CSS Tutorial . Web Front-end 740 2025-07-14 03:09:40
  • Implementing parallax scrolling effects with css
    Implementing parallax scrolling effects with css
    The parallax scrolling effect can be achieved through CSS, and the core is to make the background and content scrolling speed different. Specific methods: 1. Use background-attachment:fixed to achieve basic parallax; 2. Use a hierarchical structure to control the scrolling speed of each layer through background-position and JavaScript; 3. Pay attention to performance optimization, mobile adaptation and reasonable use of hierarchical effects to improve the experience.
    CSS Tutorial . Web Front-end 518 2025-07-14 03:09:21
  • Creating shapes and masks with CSS clip-path
    Creating shapes and masks with CSS clip-path
    clip-path is an attribute in CSS for creating shapes and masking effects, without pictures or extra HTML elements. 1. It displays part of the element by defining the crop area, commonly used preset shapes such as circle(), ellipse(), inset() and polygon(); 2. Polygons use polygon() function to define complex shapes through coordinate points, suitable for trapezoids, arrows and other designs; 3. SVG paths can be cited to achieve more advanced cropping, and you need to master the path data format; when using actual application, you need to pay attention to compatibility, performance impact, responsive adaptation and debugging difficulty. It is recommended to combine visualization tools to improve efficiency.
    CSS Tutorial . Web Front-end 564 2025-07-14 03:05:50

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