CSS 属性
在 CSS 声明 中，CSS 属性用于设置选中元素某些样式参数的内容。例如，opacity 属性用于设置选中元素的不透明度，从而可以控制该元素后面的内容是否可见：
css
/* 设置 <img> 元素的不透明度为 0.8 */
img {
opacity: 0.8;
}
每个属性都有一个名称（例如 opacity）、一个值（例如 0.8）以及在文档渲染时的定义行为。CSS 还定义了简写属性，以便于在单个声明中指定多个相关属性。例如，margin 属性是 margin-top、margin-right、margin-bottom 和 margin-left 的简写属性，用于设置元素四边的外边距：
css
/* 设置 <img> 元素的外边距为 1rem */
img {
margin: 1rem;
}
语法
css
selector {
property: value;
}
属性的字典序索引
CSS 规范定义的标准属性包括以下几种：
杂项
A
accent-coloralign-contentalign-itemsalign-selfalignment-baselineall（简写）anchor-nameanimation-compositionanimation-delayanimation-directionanimation-durationanimation-fill-modeanimation-iteration-countanimation-nameanimation-play-stateanimation-range-endanimation-range-startanimation-range（简写）animation-timelineanimation-timing-functionanimation（简写）appearanceaspect-ratio
B
Border-*
border-block-colorborder-block-end-colorborder-block-end-styleborder-block-end-widthborder-block-end（简写）border-block-start-colorborder-block-start-styleborder-block-start-widthborder-block-start（简写）border-block-styleborder-block-widthborder-block（简写）border-bottom-colorborder-bottom-left-radiusborder-bottom-right-radiusborder-bottom-styleborder-bottom-widthborder-bottom（简写）border-collapseborder-color（简写）border-end-end-radiusborder-end-start-radiusborder-image-outsetborder-image-repeatborder-image-sliceborder-image-sourceborder-image-widthborder-image（简写）border-inline-colorborder-inline-end-colorborder-inline-end-styleborder-inline-end-widthborder-inline-end（简写）border-inline-start-colorborder-inline-start-styleborder-inline-start-widthborder-inline-start（简写）border-inline-styleborder-inline-widthborder-inline（简写）border-left-colorborder-left-styleborder-left-widthborder-left（简写）border-radius（简写）border-right-colorborder-right-styleborder-right-widthborder-right（简写）border-spacingborder-start-end-radiusborder-start-start-radiusborder-style（简写）border-top-colorborder-top-left-radiusborder-top-right-radiusborder-top-styleborder-top-widthborder-top（简写）border-width（简写）border（简写）
B - C
bottombox-alignbox-decoration-breakbox-directionbox-flex-groupbox-flexbox-linesbox-ordinal-groupbox-orientbox-packbox-shadowbox-sizingbreak-afterbreak-beforebreak-insidecaption-sidecaret-animationcaret-colorcaret-shapecaret（简写）clearclip-pathclip-ruleclipcolor-interpolation-filterscolor-interpolationcolor-schemecolorcolumn-countcolumn-fillcolumn-gapcolumn-rule-colorcolumn-rule-stylecolumn-rule-widthcolumn-rule（简写）column-spancolumn-widthcolumns（简写）contain-intrinsic-block-sizecontain-intrinsic-heightcontain-intrinsic-inline-sizecontain-intrinsic-size（简写）contain-intrinsic-widthcontaincontainer-namecontainer-typecontainer（简写）content-visibilitycontentcorner-block-end-shapecorner-block-start-shapecorner-bottom-left-shapecorner-bottom-right-shapecorner-bottom-shape（简写）corner-end-end-shapecorner-end-start-shapecorner-inline-end-shapecorner-inline-start-shapecorner-left-shape（简写）corner-right-shape（简写）corner-shape（简写）corner-start-end-shapecorner-start-start-shapecorner-top-left-shapecorner-top-right-shapecorner-top-shape（简写）counter-incrementcounter-resetcounter-setcursorcxcy
D - F
ddirectiondisplaydominant-baselinedynamic-range-limitempty-cellsfield-sizingfill-opacityfill-rulefillfilterflex-basisflex-directionflex-flow（简写）flex-growflex-shrinkflex-wrapflex（简写）floatflood-colorflood-opacityfont-familyfont-feature-settingsfont-kerningfont-language-overridefont-optical-sizingfont-palettefont-size-adjustfont-sizefont-smoothfont-stretchfont-stylefont-synthesis-positionfont-synthesis-small-capsfont-synthesis-stylefont-synthesis-weightfont-synthesis（简写）font-variant-alternatesfont-variant-capsfont-variant-east-asianfont-variant-emojifont-variant-ligaturesfont-variant-numericfont-variant-positionfont-variant（简写）font-variation-settingsfont-weightfont（简写）forced-color-adjust
G - I
gap（简写）grid-area（简写）grid-auto-columnsgrid-auto-flowgrid-auto-rowsgrid-column-endgrid-column-startgrid-column（简写）grid-row-endgrid-row-startgrid-row（简写）grid-template-areasgrid-template-columnsgrid-template-rowsgrid-template（简写）grid（简写）hanging-punctuationheighthyphenate-characterhyphenate-limit-charshyphensimage-orientationimage-renderingimage-resolutioninitial-letterinline-sizeinset-block-endinset-block-startinset-block（简写）inset-block（简写）inset-inline-endinset-inline-startinset-inline（简写）inset-inline（简写）inset（简写）inset（简写）interactivityinterpolate-sizeisolation
J - M
justify-contentjustify-itemsjustify-selfleftletter-spacinglighting-colorline-breakline-clampline-height-stepline-heightlist-style-imagelist-style-positionlist-style-typelist-style（简写）list-style（简写）margin-block-endmargin-block-startmargin-block（简写）margin-bottommargin-inline-endmargin-inline-startmargin-inline（简写）margin-leftmargin-rightmargin-topmargin-trimmargin（简写）marker-endmarker-midmarker-startmarkermask-border-modemask-border-outsetmask-border-repeatmask-border-slicemask-border-sourcemask-border-widthmask-border（简写）mask-clipmask-compositemask-imagemask-modemask-originmask-positionmask-repeatmask-sizemask-typemask（简写）math-depthmath-shiftmath-stylemax-block-sizemax-heightmax-inline-sizemax-widthmin-block-sizemin-heightmin-inline-sizemin-widthmix-blend-mode
O - P
object-fitobject-positionobject-view-boxoffset-anchoroffset-distanceoffset-pathoffset-positionoffset-rotateoffset（简写）opacityorderorphansoutline-coloroutline-offsetoutline-styleoutline-widthoutline（简写）overflow-anchoroverflow-blockoverflow-clip-marginoverflow-inlineoverflow-wrapoverflow-xoverflow-yoverflow（简写）overlayoverscroll-behavior-blockoverscroll-behavior-inlineoverscroll-behavior-xoverscroll-behavior-yoverscroll-behavior（简写）padding-block-endpadding-block-startpadding-block（简写）padding-bottompadding-inline-endpadding-inline-startpadding-inline（简写）padding-leftpadding-rightpadding-toppadding（简写）page-break-afterpage-break-beforepage-break-insidepagepaint-orderperspective-originperspectiveplace-content（简写）place-items（简写）place-self（简写）pointer-eventsposition-anchorposition-areaposition-try-fallbacksposition-try-orderposition-try（简写）position-visibilitypositionprint-color-adjust
Q - S
quotesrreading-flowreading-orderresizerightrotaterow-gapruby-alignruby-overhangruby-positionrxryscalescroll-behaviorscroll-margin-block-endscroll-margin-block-startscroll-margin-block（简写）scroll-margin-bottomscroll-margin-inline-endscroll-margin-inline-startscroll-margin-inline（简写）scroll-margin-leftscroll-margin-rightscroll-margin-topscroll-margin（简写）scroll-marker-groupscroll-padding-block-endscroll-padding-block-startscroll-padding-block（简写）scroll-padding-bottomscroll-padding-inline-endscroll-padding-inline-startscroll-padding-inline（简写）scroll-padding-leftscroll-padding-rightscroll-padding-topscroll-padding（简写）scroll-snap-alignscroll-snap-stopscroll-snap-typescroll-target-groupscroll-timeline-axisscroll-timeline-namescroll-timeline（简写）scrollbar-colorscrollbar-gutterscrollbar-widthshape-image-thresholdshape-marginshape-outsideshape-renderingspeak-asstop-colorstop-opacitystroke-dasharraystroke-dashoffsetstroke-linecapstroke-linejoinstroke-miterlimitstroke-opacitystroke-widthstroke
T - Z
tab-sizetable-layouttext-align-lasttext-aligntext-anchortext-autospacetext-box-edgetext-box-trimtext-box（简写）text-combine-uprighttext-decoration-colortext-decoration-insettext-decoration-linetext-decoration-skip-inktext-decoration-skiptext-decoration-styletext-decoration-thicknesstext-decoration（简写）text-emphasis-colortext-emphasis-positiontext-emphasis-styletext-emphasis（简写）text-indenttext-justifytext-orientationtext-overflowtext-renderingtext-shadowtext-size-adjusttext-spacing-trimtext-transformtext-underline-offsettext-underline-positiontext-wrap-modetext-wrap-styletext-wrap（简写）timeline-scopetoptouch-actiontransform-boxtransform-origintransform-styletransformtransition-behaviortransition-delaytransition-durationtransition-propertytransition-timing-functiontransition（简写）translateunicode-bidiuser-modifyuser-selectvector-effectvertical-alignview-timeline-axisview-timeline-insetview-timeline-nameview-timeline（简写）view-transition-classview-transition-namevisibilitywhite-space-collapsewhite-spacewidowswidthwill-changeword-breakword-spacingwriting-modexyz-indexzoom
非标准属性
具有浏览器引擎前缀的非标准属性包括：
-moz- 前缀
-webkit- 前缀
-webkit-box-reflect-webkit-border-before（简写）-webkit-mask-box-image（简写）-webkit-mask-composite-webkit-mask-position-x-webkit-mask-position-y-webkit-mask-repeat-x-webkit-mask-repeat-y-webkit-tap-highlight-color-webkit-text-fill-color-webkit-text-security-webkit-text-stroke（简写）-webkit-text-stroke-color-webkit-text-stroke-width-webkit-touch-callout
规范
| Specification |
|---|
| CSS Syntax Module Level 3 |
| CSS Snapshot 2024 |
| CSS Cascading and Inheritance Level 6 |