- Animation (and eight associated longhand properties)
- Background-clip
- Background-origin
- Background-size
- Border-radius (and four associated longhand properties)
- Border-image (and six associated longhand properties)
- Box-decoration-break
- Box-shadow
- Box-sizing
- Columns (and thirteen associated multi-column properties)
- Clear-after
- Flex (and eleven associated Flexbox properties)
- Font-stretch
- Font-size-adjust
- Font-synthesis
- Font-kerning
- Font-variant-caps
- Hanging-punctuation
- Hyphens
- Icon
- Image-resolution
- Image-orientation
- Line-break
- Object-fit
- Object-position
- Opacity
- Outline-offset
- Overflow-wrap/word-wrap
- Backface-visibility
- Perspective
- Perspective-origin
- Pointer-events (for HTML)
- Resize
- Tab-size
- Text-align-last
- Text-decoration-line
- Text-decoration-skip
- Text-decoration-position
- Text-decoration-style
- Text-emphasis (and three associated properties)
- Text-justify
- Text-orientation
- Text-overflow
- Transform
- Transform-style
- Text-shadow
- Transition (and four associated longhand properties)
- Word-break
- Word-spacing
- Writing-mode
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- Value "Local" for the Background-attachment property
- Value "Rgba ()" for accepts a color value
- Value "HSL ()" For the property of that accepts a color value
- Value "Hsla ()" For any property that accepts a color value
- Value "CurrentColor" for any property, that accepts a color value
- Value "inset ()" For the clip property
- Value "Linear-gradient ()" For any property that accepts an image value
- Value "Radial-gradient ()" For any property that accepts an image value
- Value "Repeating-linear-gradient ()" For any property that accepts an image value
- Value "Repeating-radial-gradient ()" For any property that accepts an image value
- Value "image ()" For the property of that accepts an image value
- Multiple comma-separated images for any property that accepts an image value
- Multiple comma-separated background-related values to match multiple background image declarations
- Value "Center" for the position property
- Value "page" for the Position property
- Value "Space" for the Background-repeat property
- Value "Round" for the Background-repeat property
- New values for the cursor property
- Values "Flex" and "Inline-flex" for the display property
- Values "All-small-caps", "Petite-caps", "All-petite-caps", "Titling-caps", and "Unicase" for the Font-variant property
- Multiple, space-separated values for the Letter-spacing property
- New values for the Text-align property, including "<string>", "Match-parent", "Start", "End", and "Start End"
- Text-decoration is now a shorthand property
- Keywords "Hanging" and "Each-line" declared along with length or percentage values for the Tfext-indent property
- Value "Full-width" for the Text-transform property
- REM Units for Lengths
- Calc () units for lengths
- Toggle () Units
- Angle units (deg, Grad, Rad, turn)
- Time units (s, MS)
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- Substring matching attribute selectors ([Att^=val], [Att$=val], [Att*=val])
- : Target Pseudo-class
- New pseudo-classes:: Enabled,:d isabled,: checked, and:indeterminate
- : Root Pseudo-class
- New expression-based Structural pseudo-classes:: Nth-child (),: Nth-last-child (),: Nth-of-type (),: Nth-last-of-type ()
- Other new structural pseudo-classes:: Last-child,: First-of-type,: Last-of-type,: Only-child,: Only-of-type,: Empty
- The negation Pseudo-class:not ()
- Four pseudo-elements with Double-colon syntax (:: First-line,:: First-letter,::before,:: After)
- The Following-sibling combinator (P ~ img)
- :: Selection Pseudo-class (removed from the spec, but everyone uses it)
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- @font-face
- Media Queries
- Keyframe Animations using @keyframes
- Conditional Styles using @supports
- Namespacing using @namespace
- Regions
- Filters
Note: Features that are still in flux
- Counter Styles Level 3
- Device adaptation
- Display Module Level 3
- Line Grid
- Mobile Text Size Adjustment
- CSS Variables
- Box Alignment
- The ' All ' property
- Exclusions and Shapes
- Generated Content for Paged Media
- Grid Layout
- Grid Template Layout
- Line Layout Module
- New features in Lists and Counters
- Overflow Module
- New features in Paged Media
- New features in CSS Sizing
- Media Queries Level 4
- Selectors Level 4
- CH units
- Viewport relative Lengths
- New resolution Units
- Compositing and Blending
- New features in CSS speech
- The Unicode-range descriptor for @font-face
- New features in CSS Images and replaced Content
- CSS Masking
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