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  • Controlling element visibility with display: none vs visibility: hidden in css
    Controlling element visibility with display: none vs visibility: hidden in css
    To select display:none or visibility:hidden depends on whether element space is retained; 1. display:none completely removes elements, does not occupy space, and is suitable for dynamic control display; 2. visibility:hidden retains space, only visually hidden, suitable for animation or layout maintenance; 3. Note that display:none does not trigger the rendering tree, and cannot obtain the size, while visibility:hidden can still obtain the size through JS.
    CSS Tutorial . Web Front-end 134 2025-07-06 01:49:11
  • Using CSS Preprocessors effectively to write CSS
    Using CSS Preprocessors effectively to write CSS
    Using CSS preprocessors can improve maintainability and clarity of style sheets. 1. Nesting rules make the structure more intuitive, such as writing ul, li and a styles in .nav according to HTML hierarchy relationships, but the nesting should not exceed three layers; 2. Variables and Mixin improve reusability, such as using $primary-color to define the main tone, or using @mixin to encapsulate common style blocks to reduce duplicate code; 3. Modularly organize the code structure, merge multiple small files through @import, and split styles according to functions, which facilitates team collaboration and post-maintenance.
    CSS Tutorial . Web Front-end 843 2025-07-06 01:39:10
  • 1_60. How do you make an animation run infinitely?
    1_60. How do you make an animation run infinitely?
    To make the animation loop infinitely, it needs to set its repetition mode to a continuous loop. 1. In CSS, use the animation-iteration-count property and set it to infinite; 2. In JavaScript library such as GSAP, set repeat to -1 and enable the loop option in Anime.js; 3. In mobile development, Android can set repeatCount to infinite through XML, and iOS uses the repeatForever method of SwiftUI. At the same time, attention should be paid to performance management, interactive control and cross-device testing.
    CSS Tutorial . Web Front-end 474 2025-07-06 01:38:30
  • What is the difference between Sass and SCSS syntax?
    What is the difference between Sass and SCSS syntax?
    The main difference between Sass and SCSS is the syntax. SCSS uses curly braces {} and semicolon similar to standard CSS; to facilitate the transition from CSS, and supports direct copying of CSS code and adding variables, mixing and other functions; while Sass adopts indented syntax, no curly braces and semicolons are required, and relies on line breaks and spaces to define code blocks. It has a simpler style but is also easy to cause problems due to format errors. The two can be converted to each other through tools. Modern frameworks mostly use SCSS by default because they are easier to learn and have rich resources; file extensions are .sass and .scss respectively, and the choice should be based on personal or team preferences.
    CSS Tutorial . Web Front-end 259 2025-07-06 01:31:21
  • Optimizing CSS performance and file size
    Optimizing CSS performance and file size
    Optimizing CSS performance can improve loading speed and user experience. Specific methods include: 1. Reduce the complexity of selectors, replace multi-level nesting with class names, and avoid wildcards and excessive pseudo-class combinations; 2. Compress and merge CSS files, and use tools such as CSSNano to delete redundant content; 3. Prioritize loading of critical CSS and delay loading of non-critical styles; 4. Regularly check and delete unused redundant styles, and use DevTools and PurgeCSS to assist in cleaning.
    CSS Tutorial . Web Front-end 863 2025-07-06 01:30:31
  • Working with z-index and stacking contexts in css
    Working with z-index and stacking contexts in css
    The ineffectiveness of z-index is often due to the influence of the cascaded context. 1. The stacking context is the "space scope" of an element, and the stacking order of child elements is calculated independently; 2. The creation method includes setting positioning z-index, opacity is less than 1, transform, etc.; 3. z-index is only valid for positioning elements, and the levels cannot be directly compared when the parent-child level is in different contexts; 4. The browser comprehensively determines the stacking order based on the DOM order, positioning, layout method, etc.; 5. Practical problems such as the modal box is blocked, you need to check the context level and adjust the structure or z-index instead of blindly increasing the value.
    CSS Tutorial . Web Front-end 802 2025-07-06 01:22:30
  • Can you animate a CSS gradient?
    Can you animate a CSS gradient?
    Yes, CSS gradients can be animated by background movement. Specific methods include: 1. Use the background-position attribute to achieve linear or radial gradient flow effect with keyframe animation; 2. Set the background-size greater than the container size to provide moving space; 3. Control the animation separately through multiple background layers to achieve more complex effects; 4. Pay attention to optimizing performance, avoiding too fast animations and testing browser compatibility.
    CSS Tutorial . Web Front-end 139 2025-07-06 01:15:41
  • CSS tutorial on transitions and transforms
    CSS tutorial on transitions and transforms
    CSStransitions and transforms enhance user experience with smooth animations. 1. The transition requires specifying attributes and duration, which are often used for color or size changes; 2. The transformation includes movement, rotation, scaling, etc., which does not affect the document flow; 3. The combination of the two can create button hovering, menu switching and other effects; 4. The number of animations should be controlled during use to avoid performance problems; 5. It is recommended to use hardware-accelerated transform instead of directly modifying the position or size.
    CSS Tutorial . Web Front-end 985 2025-07-06 01:15:10
  • Controlling text wrapping and overflow in CSS
    Controlling text wrapping and overflow in CSS
    TohandletextlayoutissuesinCSS,usewhite-spacepropertiestocontrolwrappingandoverflowpropertiestomanagetruncation.1.Usewhite-spacewithvalueslikenormal,nowrap,pre-wrap,orpre-linetodefinehowtextwraps.2.Applytext-overflow:ellipsisalongwithoverflow:hiddenan
    CSS Tutorial . Web Front-end 842 2025-07-06 01:13:51
  • Styling forms effectively using CSS
    Styling forms effectively using CSS
    Style the form through CSS to improve user experience and unify the page style. The specific methods are as follows: 1. Use universal reset styles to unify the appearance of form elements, and use flex or grid layout to optimize the structure to make the form items clearly arranged; 2. Use pseudo-classes such as: focus, :hover, :invalid and :valid to enhance state feedback and improve interactive intuitiveness; 3. Use native controls to hide native controls and simulate custom controls (such as check boxes) to improve visual consistency and better match the overall design style.
    CSS Tutorial . Web Front-end 279 2025-07-06 01:06:10
  • How to set a fallback value for a CSS variable?
    How to set a fallback value for a CSS variable?
    The fallback value of the CSS variable is set through the second parameter of the var() function, which provides a default value when the variable is undefined or invalid. For example, in .box{background-color:var(--main-color,#cc);}, if --main-color is undefined or invalid, the background color will use #ccc. The fallback value is suitable for various CSS value types, such as length, keywords and nested variables, such as: 1. Default spacing padding:var(--spacing,1rem); 2. Font stack font-family:var(--heading-font,sans-serif); 3. Nested fallback
    CSS Tutorial . Web Front-end 906 2025-07-06 01:05:10
  • Using css outline property and its difference from border
    Using css outline property and its difference from border
    The outline attribute is very useful in improving web accessibility and debug layout, especially when users focus on elements. It will not affect the layout, usually be rectangular, only one element can have one, and the browser will be added to form controls by default; while border will take up space, can set rounded corners, support multi-layer borders, and need to be set manually. In actual use, it is recommended to retain or customize the focus style to ensure user experience.
    CSS Tutorial . Web Front-end 708 2025-07-06 01:02:21
  • Understanding CSS BEM methodology for naming conventions
    Understanding CSS BEM methodology for naming conventions
    BEM is a scalable and easy-to-maintain CSS organization method at the heart of improving code clarity through blocks, elements and modifier structures. 1. Block represents independent components such as .card; 2. Element is a component of the block such as .card__title; 3. Modifier is used to define variants such as .card--featured. This naming method improves team collaboration efficiency, avoids style conflicts, and enhances project scalability. When applying, you should pay attention to avoiding too deep nesting, ensuring that modifiers coexist with the underlying class, and maintaining naming consistency. Common errors include overuse of modifiers or mixing other naming specifications. Mastering BEM requires practice and discipline, but ultimately it can be revealed
    CSS Tutorial . Web Front-end 522 2025-07-06 00:31:00
  • When to use inline, block, or inline-block display in css
    When to use inline, block, or inline-block display in css
    The choice of inline, block, or inline-block depends on the element arrangement and layout requirements. 1. Use inline: Let the elements be integrated into the text stream, not occupy a single line, the width and height are invalid, suitable for the style changes in the text, such as; 2. Use block: The elements are independently blocked, and the width and height are full, and can set width and height and inner and outer margins, suitable for layout blocks such as navigation items and cards, such as display:block; 3. Use inline-block: has the flexibility of inline and the control of block, suitable for button groups, form alignment, and icon text combination, but it needs to deal with the problem of blank gaps between elements. It can be solved through HTML compact writing, font-size adjustment or negative margin.
    CSS Tutorial . Web Front-end 201 2025-07-06 00:28:50

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