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  • 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 530 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 550 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 158 2025-06-24 00:34:01
  • Is it possible to use flexbox and grid together?
    Is it possible to use flexbox and grid together?
    Yes,youcanuseflexboxandgridtogethertoenhancelayoutcapabilities.1)Usegridfortheoverallstructure,likedividingthepageintosections.2)Useflexboxwithinthesesectionsforfine-tuningalignmentandspacingofelements.Thiscombinationoffersflexibility,responsiveness,
    CSS Tutorial . Web Front-end 143 2025-06-24 00:29:40
  • What are container queries and how do they differ from media queries?
    What are container queries and how do they differ from media queries?
    Containerqueriesallowstylingelementsbasedontheircontainer'ssize,unlikemediaqueriesthatrelyontheviewport.1.Mediaqueriestargettheviewportandareidealforgloballayoutchangesbutlackcontroloverindividualcomponentsindifferentlayouts.2.Containerqueriestargeta
    CSS Tutorial . Web Front-end 242 2025-06-24 00:26:40
  • What is the CSS object-fit property for images and videos?
    What is the CSS object-fit property for images and videos?
    Theobject-fitCSSpropertycontrolshowimagesorvideosscalewithintheircontainer.1.fillstretchesmediatofit,possiblydistortingit.2.containscalesmediatofitentirelywithinthecontainerwhilepreservingaspectratio.3.coverscalesmediatocovertheentirecontainer,croppi
    CSS Tutorial . Web Front-end 1022 2025-06-24 00:25:41
  • What is the difference between a CSS transition and a CSS animation?
    What is the difference between a CSS transition and a CSS animation?
    CSS transitions are suitable for simple state changes, while CSS animations are used for complex effects. 1. The transition only supports start and end states, which are suitable for simple interactions such as button hovering; 2. The animation provides complete control through keyframes, suitable for scenes with looping playback or precise timing; 3. Both should be given priority to use opacity and transform attributes for best performance; 4. It should be selected according to needs to avoid unnecessary animations distracting users.
    CSS Tutorial . Web Front-end 477 2025-06-24 00:24:11
  • What does the animation-direction property do (e.g., alternate)?
    What does the animation-direction property do (e.g., alternate)?
    Theanimation-directionpropertyinCSScontrolsthedirectionofananimationacrosscycles,offeringfourvalues:1.normalplaystheanimationforwardeachtime,2.reverseplaysitbackward,3.alternatereversesdirectiononeverycyclestartingforward,and4.alternate-reversestarts
    CSS Tutorial . Web Front-end 505 2025-06-24 00:23:51
  • What do the flex-grow, flex-shrink, and flex-basis properties do?
    What do the flex-grow, flex-shrink, and flex-basis properties do?
    In a Flexbox layout, flex-grow, flex-shrink, and flex-basis are the three core attributes that control the behavior of child elements. 1.flex-grow determines how much the element can expand when there is extra space, and the larger the value, the larger the proportion; 2.flex-shrink determines the proportion of element shrinkage when there is insufficient space, and the larger the value, the more shrinkage; 3.flex-basis is the initial size of an element before it is stretched and can be set to a fixed value or percentage. They are usually set together by flex abbreviation properties. For example, flex:11200px means that equal proportion expansion and shrinkage are allowed, and adjusted from 200px as the starting point, thereby achieving a flexible and controllable layout effect.
    CSS Tutorial . Web Front-end 155 2025-06-24 00:20:30
  • How can you style scrollbars in CSS?
    How can you style scrollbars in CSS?
    Yes,youcanstylescrollbarsinCSS,butthelevelofcontrolvariesbybrowser.TocustomizescrollbarsforapolishedUI,use::-webkit-scrollbarpseudo-elementsforWebKitbrowsers(Chrome,Edge,Safari),allowingfullcustomizationlikecolors,sizes,andhovereffects.ForFirefox,app
    CSS Tutorial . Web Front-end 789 2025-06-24 00:18:22
  • How does CSS will-change property help with performance?
    How does CSS will-change property help with performance?
    Thewill-changepropertyinCSSsignalsthebrowserthatanelementisabouttochange,allowingittooptimizerendering.1.Itinformsthebrowserwhichpropertieswillchange,suchastransform,opacity,scroll-position,orcontents.2.Thebrowsermaythenpromotetheelementtoitsownlayer
    CSS Tutorial . Web Front-end 380 2025-06-24 00:17:01
  • What is the difference between content-box and border-box sizing?
    What is the difference between content-box and border-box sizing?
    The box-sizing property of CSS has two values: content-box and border-box. 1.content-box is the default value. The width and height of the element are only applied to the content area. padding and border will add the total size of the element; 2.border-box will include the content, padding and border in the set width and height to make the layout more controllable. For example, after setting width to 300px, under the content-box model, if 20pxpadding and 5pxborder are added, the actual width of the element becomes 350px; and when using border-box, regardless of paddi
    CSS Tutorial . Web Front-end 689 2025-06-23 00:45:11
  • What are mixins in Sass?
    What are mixins in Sass?
    MixinsinSassarereusableblocksofCSScodethatcanbeincludedanywhereusingthe@includedirective.TheyhelpkeepcodeDRYbyavoidingrepetition,especiallyforvendorprefixes,componentstyles,anddynamicstylingwitharguments.Mixinsdifferfromplaceholdersbecausetheyduplica
    CSS Tutorial . Web Front-end 935 2025-06-23 00:44:30
  • What Are CSS Counters and How Do You Use Them?
    What Are CSS Counters and How Do You Use Them?
    CSScountersareusefulforcreatingdynamicnumberinginwebprojects.1)Theyallowautomaticnumberingforlistsandheadings.2)Counterscanbenestedforhierarchicalnumberingsystems.3)Theyarelightweightbutmayhaveperformanceissueswithlargeelementcounts.4)Browsercompatib
    CSS Tutorial . Web Front-end 862 2025-06-23 00:42:31

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