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animation (and eight associated longhand properties)
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background-clip
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background-origin
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background-size
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border-radius (and four associated longhand properties)
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border-image (and six associated longhand properties)
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box-decoration-break
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box-shadow
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box-sizing
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columns (and thirteen associated multi-column properties)
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clear-after
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flex (and eleven associated flexbox properties)
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font-stretch
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font-size-adjust
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font-synthesis
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font-kerning
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font-variant-caps
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hanging-punctuation
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hyphens
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icon
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image-resolution
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image-orientation
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line-break
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object-fit
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object-position
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opacity
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outline-offset
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overflow-wrap / word-wrap
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backface-visibility
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perspective
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perspective-origin
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pointer-events (for HTML)
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resize
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tab-size
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text-align-last
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text-decoration-line
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text-decoration-skip
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text-decoration-position
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text-decoration-style
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text-emphasis (and three associated properties)
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text-justify
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text-orientation
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text-overflow
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transform
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transform-style
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text-shadow
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transition (and four associated longhand properties)
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word-break
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word-spacing
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writing-mode
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Value “local” for the background-attachment property
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Value "rgba()" for any property that accepts a color value
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Value "hsl()" for any property that accepts a color value
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Value "hsla()" for any property that accepts a color value
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Value "currentColor" for any property that accepts a color value
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Value "inset()" for the clip property
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Value "linear-gradient()" for any property that accepts an image value
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Value "radial-gradient()" for any property that accepts an image value
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Value "repeating-linear-gradient()" for any property that accepts an image value
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Value "repeating-radial-gradient()" for any property that accepts an image value
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Value "image()" for any property that accepts an image value
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Multiple comma-separated images for any property that accepts an image value
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Multiple comma-separated background-related values to match multiple background image declarations
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Value "center" for the position property
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Value "page" for the position property
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Value "space" for the background-repeat property
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Value "round" for the background-repeat property
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15 new values for the cursor property
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Values "flex" and "inline-flex" for the display property
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Values "all-small-caps", "petite-caps", "all-petite-caps", "titling-caps", and "unicase" for the font-variant property
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Multiple, space-separated values for the letter-spacing property
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New values for the text-align property, including "<string>", "match-parent", "start", "end", and "start end"
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text-decoration is now a shorthand property
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Keywords "hanging" and "each-line" declared along with length or percentage values for the tfext-indent property
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Value "full-width" for the text-transform property
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rem units for lengths
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calc() units for lengths
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toggle() units
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Angle units (deg, grad, rad, turn)
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Time units (s, ms)
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Substring matching attribute selectors ([att^=val], [att$=val], [att*=val])
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:target pseudo-class
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New pseudo-classes: :enabled, :disabled, :checked, and :indeterminate
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:root pseudo-class
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New expression-based structural pseudo-classes: :nth-child(), :nth-last-child(), :nth-of-type(), :nth-last-of-type()
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Other new structural pseudo-classes: :last-child, :first-of-type, :last-of-type, :only-child, :only-of-type, :empty
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The negation pseudo-class :not()
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Four pseudo-elements with double-colon syntax (::first-line, ::first-letter,::before, ::after)
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The following-sibling combinator (p ~ img)
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::selection pseudo-class (removed from the spec, but everyone uses it)
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@font-face
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Media Queries
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Keyframe animations using @keyframes
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Conditional styles using @supports
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Namespacing using @namespace
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Regions
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Filters
注：仍在变化中的特性
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Counter Styles Level 3
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Device Adaptation
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Display Module Level 3
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Line Grid
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Mobile Text Size Adjustment
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CSS Variables
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Box Alignment
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The "all" property
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Exclusions and Shapes
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Generated Content for Paged Media
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Grid Layout
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Grid Template Layout
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Line Layout Module
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New features in Lists and Counters
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Overflow Module
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New features in Paged Media
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New features in CSS Sizing
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Media Queries Level 4
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Selectors Level 4
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ch units
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Viewport relative lengths
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New resolution units
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Compositing and Blending
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New features in CSS speech
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The unicode-range descriptor for @font-face
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New features in CSS Images and Replaced Content
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CSS Masking
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