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  • 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 318 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 872 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 980 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 781 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 855 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 614 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 418 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 432 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 940 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 473 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 695 2025-06-24 00:37:01
  • What are the three ways to insert CSS into a webpage?
    What are the three ways to insert CSS into a webpage?
    There are three ways to insert web pages in CSS: 1. Inline styles are suitable for single element modification or debugging, but are not conducive to maintenance and reuse; 2. Internal style sheets are suitable for small projects or test pages, and the current page style is unified but cannot be shared across pages; 3. External style sheets are most recommended, suitable for multi-page projects, centrally manage styles, improve maintenance and loading speed. In actual development, external style sheets are preferred, and the other two methods are considered in special circumstances.
    CSS Tutorial . Web Front-end 541 2025-06-24 00:36:20
  • What is the animation-fill-mode property for?
    What is the animation-fill-mode property for?
    The animation-fill-mode attribute is used to control the element style representation before and after the animation starts, and it contains four values: none, forwards, backwards and both. none is the default value, and the elements return to the original style after the animation is over; forwards keep the last frame style after the animation is over; backwards applies the first frame style during the animation delay; both combine the effects of both. This property is suitable for scenes where animations need to be maintained, such as menu slide in, loading instructions, etc., and can be used in combination with animation-delay and animation-direction to take effect in non-infinite repeat animations. Use the genus correctly
    CSS Tutorial . Web Front-end 556 2025-06-24 00:35:01
  • What is CSS containment (contain property)?
    What is CSS containment (contain property)?
    CSScontainmentimprovesperformancebyisolatingelementstolimitbrowserrecalculations.1.Thecontainpropertyenablesdeveloperstospecifyhowisolatedanelementisfromtherestofthepage.2.Valueslikesize,layout,paint,andstyleofferdifferentlevelsofcontainment.3.strict
    CSS Tutorial . Web Front-end 159 2025-06-24 00:34:01

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