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  • What is Responsive Web Design (RWD)?
    What is Responsive Web Design (RWD)?
    Responsive web design (RWD) is necessary because it enhances multi-device user experience and optimizes SEO. 1. Improve the access experience of mobile users and avoid frequent scaling and sliding; 2. It is conducive to search engine optimization and maintaining a single website and content; 3. Core technologies include elastic layout, media query, elastic pictures, and breakpoint settings; 4. Implementation suggestions include mobile priority, using CSS framework, actual testing of multi-device effects, paying attention to fonts and click areas, and correctly setting the viewport.
    CSS Tutorial . Web Front-end 961 2025-06-25 00:21:41
  • Which CSS inclusion method is the fastest?
    Which CSS inclusion method is the fastest?
    InlineCSSisthefastestmethodforinitialrendering.1)InlineCSSaddsstylesdirectlytoHTML,requiringnoadditionalrequests.2)InternalCSS,withinthetag,isslightlyslowerduetoparsing.3)ExternalCSS,linkedvia,isslowestinitiallybutbenefitsfromcachingandHTTP/2,makingi
    CSS Tutorial . Web Front-end 645 2025-06-25 00:19:50
  • What are some popular CSS-in-JS libraries?
    What are some popular CSS-in-JS libraries?
    The core reason for the popularity of CSS-in-JS libraries is to improve maintainability and scope isolation. 1. styled-components is the most well-known solution in the React community. It writes CSS through template strings. The advantages include automatic prefix and support for dynamic styles, but performance and SSR require additional optimization. 2.Emotion flexibly supports multiple APIs, suitable for performance-sensitive and large-scale projects, and has good SSR support. 3. Although TailwindCSS is not a traditional CSS-in-JS, it is widely popular because of its JIT model and tool-based methods, and is suitable for designing projects with unified systems. 4. Other libraries such as styled-jsx, linaria and goober have their own characteristics and are suitable for different scenarios
    CSS Tutorial . Web Front-end 429 2025-06-25 00:17:20
  • What is the scope of a CSS Custom Property?
    What is the scope of a CSS Custom Property?
    The scope of CSS custom properties depends on the context of their declaration, global variables are usually defined in :root, while local variables are defined within a specific selector for componentization and isolation of styles. For example, variables defined in the .card class are only available for elements that match the class and their children. Best practices include: 1. Use: root to define global variables such as topic color; 2. Define local variables inside the component to implement encapsulation; 3. Avoid repeatedly declaring the same variable; 4. Pay attention to the coverage problems that may be caused by selector specificity. Additionally, CSS variables are case sensitive and should be defined before use to avoid errors. If the variable is undefined or the reference fails, the fallback value or default value initial will be used. Debug can be done through the browser developer
    CSS Tutorial . Web Front-end 298 2025-06-25 00:16:20
  • A Better API for the Intersection and Mutation Observers
    A Better API for the Intersection and Mutation Observers
    Zell discusses refactoring the Resize, Mutation, and Intersection Observer APIs for easier usage, demonstrating how to implement callback and event listener patterns, while highlighting available options and methods.
    CSS Tutorial . Web Front-end 869 2025-06-24 10:24:13
  • What is 'render-blocking CSS'?
    What is 'render-blocking CSS'?
    CSS blocks page rendering because browsers view inline and external CSS as key resources by default, especially with imported stylesheets, header large amounts of inline CSS, and unoptimized media query styles. 1. Extract critical CSS and embed it into HTML; 2. Delay loading non-critical CSS through JavaScript; 3. Use media attributes to optimize loading such as print styles; 4. Compress and merge CSS to reduce requests. It is recommended to use tools to extract key CSS, combine rel="preload" asynchronous loading, and use media delayed loading reasonably to avoid excessive splitting and complex script control.
    CSS Tutorial . Web Front-end 960 2025-06-24 00:42:11
  • What is the difference between hardware-accelerated and non-hardware-accelerated animations?
    What is the difference between hardware-accelerated and non-hardware-accelerated animations?
    Hardware-acceleratedanimationsusetheGPUforsmootherperformance,whilenon-hardware-acceleratedonesrelyontheCPU.1.HardwareaccelerationoffloadsvisualtaskstotheGPUviapropertiesliketransformandopacity.2.GPUanimationsrunsmoother,especiallyduringcomplexorfreq
    CSS Tutorial . Web Front-end 778 2025-06-24 00:41:31
  • What is BEM (Block, Element, Modifier) methodology?
    What is BEM (Block, Element, Modifier) methodology?
    BEM is a naming specification for writing maintainable HTML and CSS. 1. Block is an independent and reusable component, such as .menu or .button, which should be named semantically; 2. Element is an integral part of Block, named such as .menu__item, which should not exist alone and should not be nested too deeply; 3. Modifier represents state or variant, such as .button--primary, which should only define different styles and avoid complex combinations; BEM improves naming clarity, reduces conflicts, facilitates maintenance and unifies team structure.
    CSS Tutorial . Web Front-end 852 2025-06-24 00:40:50
  • 1t47. What are variable fonts?
    1t47. What are variable fonts?
    Variablefontsaredifferentbecausetheycombinemultiplevariationsintoasinglefileusingadjustableaxes.1)Theyofferflexibilitybyallowingon-the-flyadjustmentsforweight,width,slant,andcustomsettingsinsteadofrelyingonfixedstyles.2)Theyreducefilesize,improveperf
    CSS Tutorial . Web Front-end 610 2025-06-24 00:40:30
  • What is the correct order for link pseudo-classes (LVHA)?
    What is the correct order for link pseudo-classes (LVHA)?
    Linked pseudo-classes must be written in LVHA order to avoid style conflicts, because the CSS selector parses from right to left and the styles defined later have higher priority. 1.Link (not accessed) should be defined first to ensure that the underlying state is not overwritten; 2. Visited (visited) then define to avoid affecting the unreached link style; 3.Hover (hover) is placed in front of Active to prevent the activation state from overwritten by hover; 4.Active (activation) finally defines to ensure that the style is triggered correctly when clicked. In actual use, you need to pay attention to: do not miss key states, consider accessibility, test different device behaviors, mobile terminals can combine: focus to enhance the experience, alternative writing methods such as merging selectors or using preprocessors can also effectively manage styles.
    CSS Tutorial . Web Front-end 413 2025-06-24 00:40:10
  • What is the viewport meta tag and why is it important?
    What is the viewport meta tag and why is it important?
    Theviewportmetatagisessentialformobilewebsiteoptimization.Itcontrolspagedimensionsandscalingonmobiledevices,ensuringcontentdisplayscorrectlywithoutforcedzooming.Withoutit,browsersdefaulttodesktoprendering,makingsiteshardtoreadornavigate.Apropersetupu
    CSS Tutorial . Web Front-end 431 2025-06-24 00:39:30
  • What is the Critical Rendering Path and how does CSS affect it?
    What is the Critical Rendering Path and how does CSS affect it?
    Critical rendering path (CRP) is the core process for the browser to render a page for the first time, which directly affects the loading speed. It includes six steps: parsing HTML to build a DOM tree, parsing CSS to build a CSSOM tree, generating a rendering tree, layout, drawing and compositing layers. CSS plays a key role in it. Because of its blocking rendering characteristics, it must wait until the CSSOM is completed before the subsequent process can be continued. Optimizing CSS can improve CRP performance by streamlining key CSS and inlining, splitting compressed files, separating styles with media queries, avoiding complex selectors, etc., thereby speeding up the first-screen loading speed.
    CSS Tutorial . Web Front-end 939 2025-06-24 00:39:10
  • @keyframes for professional web design
    @keyframes for professional web design
    @keyframesareessentialinprofessionalwebdesignforcreatingdynamicandengaginguserinterfaces.Theyenhanceuserexperience,guideattention,andimproveperformancebyoffloadinganimationworkfromJavaScripttoCSS.Touse@keyframeseffectively:1)Chooseappropriatetimingan
    CSS Tutorial . Web Front-end 467 2025-06-24 00:37:31
  • What is the scroll-snap-type property for?
    What is the scroll-snap-type property for?
    scroll-snap-type is used to control the rolling adsorption behavior of elements in the container, and to achieve precise control of the rolling position by setting the axial direction and stringency. 1. Commonly used for layouts such as full-screen sliders, horizontal carousel diagrams, vertical timelines, etc.; 2. It is necessary to use scroll-snap-align of sub-elements, such as setting .container{scroll-snap-type:ymandatory} and .section{scroll-snap-align:start}; 3. The axial value x/y/block determines the scroll direction, and the strictness value mandatory/proximity determines the adsorption intensity; 4. Common errors include not setting sub-
    CSS Tutorial . Web Front-end 691 2025-06-24 00:37:01

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