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  • What are fr units in CSS Grid?
    What are fr units in CSS Grid?
    ThefrunitinCSSGriddistributesavailablespaceproportionally.1.Itworksbydividingspacebasedonthesumoffrvalues,e.g.,1fr2frgivesone-thirdandtwo-thirds.2.Itenablesflexiblelayouts,avoidsmanualcalculations,andsupportsresponsivedesign.3.Commonusesincludeequal-
    CSS Tutorial . Web Front-end 602 2025-06-22 00:46:31
  • CSS Case Sensitivity Rules: A Quick Guide
    CSS Case Sensitivity Rules: A Quick Guide
    CSSselectorsarecase-sensitivedependingonthedocumenttype:inHTMLtheyarecase-insensitive,whileinXMLorXHTMLtheyarecase-sensitive.Propertynamesandvaluesarealwayscase-insensitive,URLsandURIsarecase-sensitive,andcustompropertynamesarecase-sensitive.
    CSS Tutorial . Web Front-end 780 2025-06-22 00:45:11
  • When should you use rem units over em units?
    When should you use rem units over em units?
    The use of rem units is more suitable for global layout and consistent design. 1. Rem is based on the font size of the root element to ensure uniformity; 2. Avoid the problem of size overlay during nesting; 3. Suitable for setting global spacing and layout; 4. Em is suitable for scenes that require local scaling, such as buttons, labels or designs that focus on layout proportions.
    CSS Tutorial . Web Front-end 753 2025-06-22 00:44:50
  • CSS counters: The most complete tutorial
    CSS counters: The most complete tutorial
    CSScountersenableautomaticnumberinginHTMLwithoutJavaScript.Usethemforlistsandtablesofcontents:1)Setupcounterswithcounter-reset;2)Incrementwithcounter-increment;3)Displayusing::beforewithcontent:counter(name).Theyenhancewebdevelopmentbutconsiderperfor
    CSS Tutorial . Web Front-end 223 2025-06-22 00:43:00
  • What is the difference between a border and an outline?
    What is the difference between a border and an outline?
    Bordersarestructuralandaffectlayout,whileoutlinesarevisualaidsthatdonotimpactpositioning.1.Borderssitbetweenpaddingandmargin,affectingelementsizeandlayout,whereasoutlinesappearoutsidetheboxmodelwithoutalteringspacing.2.Bordersofferdetailedstylingpers
    CSS Tutorial . Web Front-end 1008 2025-06-22 00:41:21
  • Can you nest a Flexbox container inside a CSS Grid item?
    Can you nest a Flexbox container inside a CSS Grid item?
    Yes, you can use Flexbox in CSSGrid items. The specific approach is to first divide the page structure with Grid and set the subcontainer into a Grid cell as a Flex container to achieve more fine alignment and arrangement; for example, nest a div with display:flex style in HTML; the benefits of doing this include hierarchical layout, easier responsive design, and more friendly component development; it is necessary to note that the display attribute only affects direct child elements, avoids excessive nesting, and considers the compatibility issues of old browsers.
    CSS Tutorial . Web Front-end 582 2025-06-22 00:40:20
  • What is a CSS animation defined with @keyframes?
    What is a CSS animation defined with @keyframes?
    @keyframes is used in CSS to create keyframe animations, allowing developers to define the styles of elements at different stages of the animation. 1. Specify the style of each stage of the animation through percentage or from/to, such as 0%, 50%, and 100% respectively representing the start, middle and end states respectively; 2. Use the animation attribute to apply the defined keyframe animation to elements, including setting the animation name, duration, speed function, delay and number of playbacks, etc.; 3. Commonly used to implement complex custom animation effects, such as loading indicators, hover effects, UI feedback and background animation; 4. Notes include ensuring that the start and end frames are included, avoiding layout jitter caused by animation, testing browser compatibility, and using animation
    CSS Tutorial . Web Front-end 652 2025-06-22 00:37:01
  • How to use the :nth-child() pseudo-class?
    How to use the :nth-child() pseudo-class?
    :nth-child() pseudo-class is used in CSS to accurately select specific child elements based on element position. Its basic syntax is element:nth-child(n), which can select the nth child element, and supports odd, even and an b formulas, such as 2n 1 or n 3, respectively, to realize odd line selection or custom interval and starting point. For example, tr:nth-child(even) adds background color to even rows of the table. Unlike :nth-of-type(), :nth-child() calculates all child elements, while the former only calculates the same element. Common uses include zebra pattern tables, gallery layouts, navigation menus and form typesettings. When using them, you need to use them flexibly in combination with specific HTML structures.
    CSS Tutorial . Web Front-end 235 2025-06-22 00:35:01
  • How does the CSS cascade and inheritance work?
    How does the CSS cascade and inheritance work?
    InCSS,stylesareappliedthroughthecascadeandinheritance.Thecascadedetermineswhichstyleswinbasedonimportance(e.g.,!important),specificity(inline>ID>class>element),andsourceorder(laterrulesoverrideearlierones).Inheritanceallowschildelementstoinh
    CSS Tutorial . Web Front-end 216 2025-06-22 00:33:01
  • How to style a link based on its state (:link, :visited, :hover, :active)?
    How to style a link based on its state (:link, :visited, :hover, :active)?
    In web development, the style of linking different states can be individually set through the pseudo-class of CSS to improve the user experience. 1. First understand the meaning of each pseudo-class::link means no link is visited, :visited means the link has been visited, :hover means the hover state, and :active means the instant of clicking; 2. Writing pseudo-classes in LVHA order ensures the correct priority, and the order should be: link, :visited, :hover, :active; 3. Style suggestions include avoiding the use of similar colors to distinguish states, combining text decoration to enhance recognition, and pay attention to the differences in behavior of mobile:hover; 4. When considering accessibility, it is recommended to add: focus status to support screen reader users to ensure link gathering
    CSS Tutorial . Web Front-end 522 2025-06-22 00:32:41
  • How does 'purging' unused CSS work in tools like PurgeCSS?
    How does 'purging' unused CSS work in tools like PurgeCSS?
    PurgingunusedCSSworksbyscanningyourprojectfilestofindwhichCSSclassesareactuallyused,andremovingtheonesthataren't.ToolslikePurgeCSShelpreduceCSSfilesizesdramaticallybyeliminatingstylesthatdon’tapplytoyourfinalwebsit
    CSS Tutorial . Web Front-end 626 2025-06-22 00:30:30
  • CSS Grid and Flexbox: Similarities and Differences Explained
    CSS Grid and Flexbox: Similarities and Differences Explained
    CSSGridisidealfortwo-dimensionallayouts,whileFlexboxexcelsinone-dimensionalscenarios.1)UseGridforcomplexlayoutslikedashboardsorresponsivedesigns.2)UseFlexboxforaligningitemsinasingledirection,suchasnavigationmenusorforms.
    CSS Tutorial . Web Front-end 782 2025-06-22 00:30:11
  • Unlock CSS Animation Power with @keyframes: A Deep Dive
    Unlock CSS Animation Power with @keyframes: A Deep Dive
    The full potential of unlocking CSS animations with @keyframes can be achieved through the following steps: 1) Define the start, end and intermediate state of the animation sequence; 2) Use multi-stage animation to control multiple attributes of the element; 3) Adjust the -timing function to optimize animation effects; 4) Use will-change to improve performance; 5) Choose the appropriate animation duration; 6) Use animations carefully to avoid excessive use; 7) Ensure cross-browser compatibility with vendor prefixes; 8) Dynamically control animations with JavaScript. Through these methods, you can create amazing animations that enhance web design.
    CSS Tutorial . Web Front-end 183 2025-06-22 00:27:10
  • How to center an item both horizontally and vertically using Flexbox?
    How to center an item both horizontally and vertically using Flexbox?
    To center elements horizontally and vertically in the container, 1. Set the container as a Flex container and use display:flex; 2. Use justify-content:center to center the main axis direction; 3. Use align-items:center to center the cross axis direction; if the container has multiple child elements, it will be arranged horizontally and centered overall by default. If you need vertical arrangement, you can combine flex-direction:column and keep the alignment attribute unchanged, and the centering effect can be achieved.
    CSS Tutorial . Web Front-end 432 2025-06-22 00:22:31

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