Make parser support CSS properties.

[SpinyOwl]

At least most important should be implemented.

Checklist of all existing css properties (to track progress):

• align-content
• align-items
• align-self
• all
• animation
• animation-delay
• animation-direction
• animation-duration
• animation-fill-mode
• animation-iteration-count
• animation-name
• animation-play-state
• animation-timing-function
• backface-visibility
• background
• background-attachment
• background-blend-mode
• background-clip
• background-color
• background-image
• background-origin
• background-position
• background-repeat
• background-size
• border
• border-bottom
• border-bottom-color
• border-bottom-left-radius
• border-bottom-right-radius
• border-bottom-style
• border-bottom-width
• border-collapse
• border-color
• border-image
• border-image-outset
• border-image-repeat
• border-image-slice
• border-image-source
• border-image-width
• border-left
• border-left-color
• border-left-style
• border-left-width
• border-radius
• border-right
• border-right-color
• border-right-style
• border-right-width
• border-spacing
• border-style
• border-top
• border-top-color
• border-top-left-radius
• border-top-right-radius
• border-top-style
• border-top-width
• border-width
• bottom
• box-decoration-break
• box-shadow
• box-sizing
• break-after
• break-before
• break-inside
• caption-side
• caret-color
• @charset
• clear
• clip
• clip-path
• color
• column-count
• column-fill
• column-gap
• column-rule
• column-rule-color
• column-rule-style
• column-rule-width
• column-span
• column-width
• columns
• content
• counter-increment
• counter-reset
• cursor
• direction
• display
  • FLEX
  • NONE
  • BLOCK
  • INLINE
• empty-cells
• filter
• flex
• flex-basis
• flex-direction
• flex-flow
• flex-grow
• flex-shrink
• flex-wrap
• float
• font
• @font-face
• font-family
• font-feature-settings
• font-kerning
• font-size
• font-size-adjust
• font-stretch
• font-style
• font-variant
• font-variant-caps
• font-weight
• grid
• grid-area
• grid-auto-columns
• grid-auto-flow
• grid-auto-rows
• grid-column
• grid-column-end
• grid-column-gap
• grid-column-start
• grid-gap
• grid-row
• grid-row-end
• grid-row-gap
• grid-row-start
• grid-template
• grid-template-areas
• grid-template-columns
• grid-template-rows
• hanging-punctuation
• height
• hyphens
• @import
• isolation
• justify-content
• @keyframes
• left
• letter-spacing
• line-height
• list-style
• list-style-image
• list-style-position
• list-style-type
• margin
• margin-bottom
• margin-left
• margin-right
• margin-top
• max-height
• max-width
• @media
• min-height
• min-width
• mix-blend-mode
• object-fit
• object-position
• opacity
• order
• outline
• outline-color
• outline-offset
• outline-style
• outline-width
• overflow
• overflow-x
• overflow-y
• padding
• padding-bottom
• padding-left
• padding-right
• padding-top
• page-break-after
• page-break-before
• page-break-inside
• perspective
• perspective-origin
• pointer-events
• position
  • absolute
  • relative
  • static
  • fixed
• quotes
• resize
• right
• scroll-behavior
• tab-size
• table-layout
• text-align
• text-align-last
• text-decoration
• text-decoration-color
• text-decoration-line
• text-decoration-style
• text-indent
• text-justify
• text-overflow
• text-shadow
• text-transform
• top
• transform
• transform-origin
• transform-style
• transition
• transition-delay
• transition-duration
• transition-property
• transition-timing-function
• unicode-bidi
• user-select
• vertical-align
• visibility
• white-space
• width
• word-break
• word-spacing
• word-wrap
• writing-mode
• z-index