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  • What is the prefers-color-scheme media feature for dark mode?
    What is the prefers-color-scheme media feature for dark mode?
    prefers-color-scheme is a CSS media query function that detects whether the user's operating system has set dark or light colors. ① It allows the website to apply different styles according to the user's system preferences without forcing dark mode to be enabled; ② When using it, it must wrap dark styles through @media(prefers-color-scheme:dark) in the style sheet; ③ Define the default style as a fallback plan; ④ It can combine localStorage to enable users to manually switch themes; ⑤ Modern browsers generally support it, but only rely on system settings and do not respond to ambient light or time changes.
    CSS Tutorial . Web Front-end 669 2025-07-14 01:55:01
  • How to write maintainable and scalable CSS?
    How to write maintainable and scalable CSS?
    To write a maintainable and extensible CSS, the core lies in clear structure, standardized naming, and modular design. 1. Use BEM naming specifications to clarify the relationship between blocks, elements, and modifiers, avoid class name conflicts, and improve structural clarity; 2. Modularly organize CSS files and split them according to functions to facilitate collaboration and maintenance; 3. Reasonable use of preprocessors such as Sass, and use variables, nesting, and mixing to improve development efficiency; 4. Avoid excessive nesting and excessive length selectors, maintain simple styles and high performance, and enhance maintainability.
    CSS Tutorial . Web Front-end 258 2025-07-14 01:49:40
  • Animating elements with css transitions and keyframes
    Animating elements with css transitions and keyframes
    The key to improving user experience in CSS animation is to choose transition and @keyframes reasonably. 1. Transition is suitable for simple state changes, such as button hover effect, which is achieved by defining attributes, duration, delay and speed curves; 2. @keyframes is suitable for complex animation sequences, such as loading animations, which controls the state of elements at different time points through multiple keyframes. Usage tips include: prioritizing the use of transform and opacity to improve performance, ensuring the initial consistency is consistent with the target state, and setting the ease function reasonably. Frequently asked questions: enable hardware acceleration in a timely manner and reduce nesting, check the property name and initial value when the transition does not take effect, and repeat animation playback can be performed through inf
    CSS Tutorial . Web Front-end 756 2025-07-14 01:39:20
  • Implementing responsive design approaches: mobile-first vs desktop-first in css
    Implementing responsive design approaches: mobile-first vs desktop-first in css
    Mobile-first and desktop-first have their own applicable scenarios, and the selection needs to be based on project needs. 1. mobile-first first writes the mobile style, and then adapts to the large screen through min-width media query, which is suitable for mobile phone-first projects, such as e-commerce front desk; 2. desktop-first first designs for desktops, using max-width media query to adapt to small screens, which is suitable for desktop-first products such as background management systems; 3. The core difference between the two is that the media query direction is different. The former expands from small screen to large screen, and the latter shrinks from large screen to small screen; 4. In either way, you need to add a viewport meta tag to ensure normal display of the mobile terminal; 5. mobile
    CSS Tutorial . Web Front-end 378 2025-07-14 01:33:31
  • Controlling content overflow with CSS overflow property options
    Controlling content overflow with CSS overflow property options
    TheCSSoverflowpropertycontrolshowcontentishandledwhenitoverflowsitscontainer,withvalueslikevisible,hidden,scroll,andauto.1.visibleallowscontenttospilloutbydefault;2.hiddenclipsoverflowcontent;3.scrolladdspermanentscrollbars;4.autoshowsscrollbarsonlyw
    CSS Tutorial . Web Front-end 981 2025-07-14 01:17:00
  • Implementing responsive images with CSS
    Implementing responsive images with CSS
    The core of responsive images is to adapt the picture to the screen and maintain proportion. 1. Set width:100% and height:auto to achieve basic adaptation; 2. Use tags to load pictures with different resolutions with srcset and media properties; 3. Control the filling method through object-fit, such as cover cropping, contain white space, and fill stretching. These methods ensure that the image display is appropriate and performance is optimized under different devices.
    CSS Tutorial . Web Front-end 519 2025-07-14 00:34:01
  • Understanding css specificity and how it is calculated
    Understanding css specificity and how it is calculated
    CSS specificity is the core mechanism that determines the priority of styles, and determines which rule takes effect through the weight calculation of the selector. Inline styles score 1000 points, ID selectors score 100 points each, classes, attributes, and pseudo-classes score 10 points each, elements and pseudo-elements score 1 point each; different categories scores cannot be carried; for example, ten class selectors (100 points) are still lower than one ID (100 points). Abuse of !important should be avoided, understanding the order of inheritance and cascade, and analyzing style conflicts with browser tools.
    CSS Tutorial . Web Front-end 687 2025-07-13 03:07:10
  • Using css custom properties (variables) for maintainability
    Using css custom properties (variables) for maintainability
    Using CSS variables can effectively improve style maintainability. 1. By unified designing the basic elements of the system such as colors, fonts, etc., global calls and modifications are realized, such as defining --color-primary and reusing them in multiple components; 2. Component-level variables support local customization, such as setting independent margins and background colors for card components; 3. Dynamically switch variable values in combination with media query to achieve responsive design; 4. Good naming and organizational methods, such as semantic naming and module grouping, helping team collaboration. Use CSS variables reasonably to make the project easier to maintain and expand.
    CSS Tutorial . Web Front-end 1005 2025-07-13 03:06:51
  • How to create a sticky header or footer using css position sticky
    How to create a sticky header or footer using css position sticky
    To implement stickyheader or footer, the key is to use position:sticky correctly. When implementing stickyheader, you need to set position:sticky and top:0, and make sure that the parent container does not have overflow:hidden. It is recommended to add z-index to prevent overwriting; 1. Stickyheader does not detach from the document flow, and is fixed when scrolling to the top, and does not affect the layout of other content; 2. When implementing stickyfooter, you need to wrap the main content and set footer's position:sticky and bottom:0, but it only takes effect when the content is less than one screen; 3. When using sticky, you need to
    CSS Tutorial . Web Front-end 311 2025-07-13 03:03:20
  • Implementing text overflow ellipsis with CSS
    Implementing text overflow ellipsis with CSS
    Text overflow ellipsis can be implemented through CSS. Use white-space:nowrap, overflow:hidden, and text-overflow:ellipsis for single lines; use display:-webkit-box, -webkit-box-orient:vertical, and -webkit-line-clamp to control the number of lines and cooperate with overflow:hidden. 1. A single line needs to set the width, otherwise it will not take effect; 2. Multiple lines need to specify the number of lines and rely on the support of WebKit browser; 3. Common problems include container size not limited, text overflow, layout interference or word-break influence
    CSS Tutorial . Web Front-end 887 2025-07-13 03:02:50
  • How to create an overlapping layout with CSS Grid?
    How to create an overlapping layout with CSS Grid?
    The key to using CSSGrid to achieve a cascade layout is the cooperation of grid-area and z-index. 1. Set the row and column ranges of different elements through grid-area to make them overlap in position; 2. Use position and z-index to control the stacking order of elements to let specific elements be displayed on the upper layer; 3. You can combine translucent background to achieve visual fusion effect; 4. For complex layouts, you can use grid-template-areas to name areas to simplify the structure, and manually specify the coverage area through grid-area. Mastering these methods can flexibly achieve various stacked layout effects.
    CSS Tutorial . Web Front-end 848 2025-07-13 02:56:10
  • What is the purpose of the content property in pseudo-elements?
    What is the purpose of the content property in pseudo-elements?
    The content attribute is used in CSS to insert generated content into a pseudo-element. Its core role is to add visual content in non-HTML structures, such as text, symbols, pictures, or automatic counters. 1. Insert text or symbols: can be used to add labels or icons, such as "Note:" or Unicode characters; 2. Add images or counters: supports inserting pictures and implementing automatic numbering; 3. Style control: styles such as fonts, colors and layouts can be applied to the generated content; 4. Use restrictions: It should be avoided to use critical information or large amounts of text to avoid affecting accessibility and maintenance.
    CSS Tutorial . Web Front-end 861 2025-07-13 02:50:50
  • Techniques for optimizing CSS performance and load times
    Techniques for optimizing CSS performance and load times
    CSS performance optimization can improve web page loading speed and user experience. The main methods include: 1. Reduce the CSS file size, use compression tools, delete redundant code, merge class names, and avoid global reset; 2. Use critical path CSS, extract and inline the required styles on the first screen, and delay loading of non-critical CSS; 3. Load non-critical CSS asynchronously, use media attributes, dynamic insertion or preload preload; 4. Optimize selectors and hierarchical structures, give priority to the use of class selectors, avoid long-chain nesting, and control specificity. These methods help speed rendering, reduce resource consumption, while taking into account maintainability.
    CSS Tutorial . Web Front-end 351 2025-07-13 02:36:50
  • How to build a modal or popup box CSS tutorial
    How to build a modal or popup box CSS tutorial
    To create a basic modal box or pop-up box, first build the structure using HTML, then style it through CSS, and optionally implement interaction using JavaScript. 1. The HTML part includes trigger buttons, modal box containers and contents; 2. CSS is used to set positioning, overlaying and centering effects; 3. JavaScript controls display and hide; 4. Responsive design recommends using percentage width and media query to adapt to different devices. The whole process is simple and effective and is suitable for most simple scenarios.
    CSS Tutorial . Web Front-end 697 2025-07-13 02:35:40

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