各ブラウザのスタイルシートサポート状況を調べてみたので、その一覧を示します。

C1 Cascading Style Sheet Level 1
e3 Internet Explorer 3.0(Windows 95)
e4 Internet Explorer 4.0(Windows 95)
e5 Internet Explorer 5.0(Windows 95)
N4 Netscape Communicator 4.01(Windows 95)

O 仕様で定義されているもの。ブラウザで動作確認できたもの。
o 定義されているが、動作を確認していないもの。
e 定義されているが、動作しないもの。
x サポートされていないもの。
? 不明。

{length} は長さを表します。例えば次のような値を指定します。

99cm ... centimeters
99em ... element's font M
99ex ... element's font x
99in ... inches
99mm ... millimeters
99pc ... picas
99pt ... points
99px ... pixels

{%} は割合を表します。例えば次のような値を指定します。

99%

{url} はURLを表します。例えば次のような値を指定します。

url(http://〜/〜)

{color} は色を表します。例えば次のような値を指定します。

red
#FF0000
#F00
rgb(255,0,0)
rgb(100%,0%,0%)

+-----------+
| C e e e N |
| 1 3 4 5 4 |
+-----------+
| O O O O O | background: {color}
| O O O O O | background: {url}
| O O O O O | background: repeat
| O O O O O | background: repeat-x
| O O O O O | background: repeat-y
| O O O O O | background: no-repeat
| O O O O x | background: scroll
| O O O O x | background: fixed
| O O O O x | background: left
| O O O O x | background: center
| O O O O x | background: right
| O O O O x | background: top
| x O O O x | background: middle
| O O O O x | background: bottom
| O O O O x | background: {%}
| O e O O x | background: {length}
+-----------+
| O x O O O | background-color: {color}
| O x e o x | background-color: transparent
+-----------+
| O x O O O | background-image: {url}
| O x O O O | background-image: none
+-----------+
| O x O O O | background-repeat: repeat
| O x O O O | background-repeat: repeat-x
| O x O O O | background-repeat: repeat-y
| O x O O O | background-repeat: no-repeat
+-----------+
| O x O O x | background-attachment: scroll
| O x O O x | background-attachment: fixed
+-----------+
| O x O O x | background-position: {%}
| O x O O x | background-position: {length}
| O x O O x | background-position: top
| O x O O x | background-position: center
| O x O O x | background-position: bottom
| O x O O x | background-position: left
| O x O O x | background-position: center
| O x O O x | background-position: right
+-----------+
| O x O O O | border: thin
| O x O O O | border: medium
| O x O O O | border: thick
| O x O O O | border: {length}
| O x O O O | border: none
| O x e o x | border: dotted
| O x e o x | border: dashed
| O x O O O | border: solid
| O x O O O | border: double
| O x O O O | border: groove
| O x O O O | border: ridge
| O x O O O | border: inset
| O x O O O | border: outset
| O x O O O | border: {color}
+-----------+
| O x O O x | border-top: {borderと同じ}
| O x O O x | border-right: {borderと同じ}
| O x O O x | border-bottom: {borderと同じ}
| O x O O x | border-left: {borderと同じ}
+-----------+
| O x O O O | border-width: thin
| O x O O O | border-width: medium
| O x O O O | border-width: thick
| O x O O O | border-width: {length}
+-----------+
| O x O O O | border-top-width: thin
| O x O O O | border-top-width: medium
| O x O O O | border-top-width: thick
| O x O O O | border-top-width: {length}
| O x O O O | border-right-width: thin
| O x O O O | border-right-width: medium
| O x O O O | border-right-width: thick
| O x O O O | border-right-width: {length}
| O x O O O | border-bottom-width: thin
| O x O O O | border-bottom-width: medium
| O x O O O | border-bottom-width: thick
| O x O O O | border-bottom-width: {length}
| O x O O O | border-left-width: thin
| O x O O O | border-left-width: medium
| O x O O O | border-left-width: thick
| O x O O O | border-left-width: {length}
+-----------+
| O x O O O | border-color: {color}
+-----------+
| O x O O O | border-style: none
| O x e o x | border-style: dotted
| O x e o x | border-style: dashed
| O x O O O | border-style: solid
| O x O O O | border-style: double
| O x O O O | border-style: groove
| O x O O O | border-style: ridge
| O x O O O | border-style: inset
| O x O O O | border-style: outset
+-----------+
| x x o o x | clip: auto
| x x o o x | clip: rect({length}, {length}, {length}, {length})
+-----------+
| O x O O O | clear: none
| O x O O O | clear: left
| O x O O O | clear: right
| O x O O O | clear: both
+-----------+
| O O O O O | color: {color}
+-----------+
| x x O O x | cursor: auto
| x x O O x | cursor: crosshair
| x x O O x | cursor: default
| x x O O x | cursor: hand
| x x O O x | cursor: move
| x x O O x | cursor: e-resize
| x x O O x | cursor: ne-resize
| x x O O x | cursor: nw-resize
| x x O O x | cursor: n-resize
| x x O O x | cursor: se-resize
| x x O O x | cursor: sw-resize
| x x O O x | cursor: s-resize
| x x O O x | cursor: w-resize
| x x O O x | cursor: text
| x x O O x | cursor: wait
| x x O O x | cursor: help
+-----------+
| O x e o O | display: block
| O x e o O | display: inline
| O x e o O | display: list-item
| O x O O O | display: none
+-----------+
| x x O O x | filter: {filter}
+-----------+
| O x O O O | float: left
| O x O O O | float: right
| O x O O O | float: none
+-----------+
| O O O O O | font: style variant weight size/height family
+-----------+
| O O O O O | font-family: serif
| O e O O e | font-family: sans-serif
| O e O O e | font-family: cursive
| O e O O e | font-family: fantasy
| O O O O O | font-family: monospace
+-----------+
| O O O O O | font-size: xx-small
| O O O O O | font-size: x-small
| O O O O O | font-size: small
| O O O O O | font-size: medium
| O O O O O | font-size: large
| O O O O O | font-size: x-large
| O O O O O | font-size: xx-large
| O O e o O | font-size: larger
| O O O O O | font-size: smaller
| O O O O O | font-size: 10cm
| O O O O O | font-size: 10em
| O O O O O | font-size: 10ex
| O O O O O | font-size: 10in
| O O O O O | font-size: 10mm
| O O O O O | font-size: 10pc
| O O O O O | font-size: 10pt
| O O O O O | font-size: 10px
| O O O O O | font-size: 10%
+-----------+
| O e O O O | font-style: normal
| O O O O O | font-style: italic
| O x O O x | font-style: oblique
+-----------+
| O x O O x | font-variant: normal
| O x O O x | font-variant: small-caps
+-----------+
| x e x x x | font-weight: extra-light
| x e x x x | font-weight: light
| x e x x x | font-weight: demi-light
| x e x x x | font-weight: medium
| x e x x x | font-weight: demi-bold
| x O x x x | font-weight: extra-bold
| O x e o e | font-weight: normal
| O O O O O | font-weight: bold
| O x O O O | font-weight: bolder
| O x e o e | font-weight: lighter
| O x e o e | font-weight: 100
| O x e o e | font-weight: 200
| O x e o e | font-weight: 300
| O x e o e | font-weight: 400
| O x e o e | font-weight: 500
| O x O O O | font-weight: 600
| O x O O O | font-weight: 700
| O x O O O | font-weight: 800
| O x O O O | font-weight: 900
+-----------+
| x x O O O | left: {length}
| x x O O O | left: {%}
| x x O O O | left: auto
+-----------+
| O x O O x | letter-spacing: normal
| O x O O x | letter-spacing: {length}
+-----------+
| O x O O O | line-height: normal
| O x O O O | line-height: {number}
| O O O O O | line-height: {length}
| O O O O O | line-height: {%}
+-----------+
| O x O O x | list-style: {type}
| O x O O x | list-style: {position}
| O x O O x | list-style: {url}
+-----------+
| O x O O x | list-style-image: {url}
| O x O O x | list-style-image: none
+-----------+
| O x O O x | list-style-position: inside
| O x O O x | list-style-position: outside
+-----------+
| O x O O O | list-style-type: disc
| O x O O O | list-style-type: circle
| O x O O O | list-style-type: square
| O x O O O | list-style-type: decimal
| O x O O O | list-style-type: lower-rmoan
| O x O O O | list-style-type: upper-roman
| O x O O O | list-style-type: lower-alpha
| O x O O O | list-style-type: upper-alpha
| O x O O O | list-style-type: none
+-----------+
| O O O O O | margin: {length}
| O O O O O | margin: {%}
| O x O O O | margin: auto
| O O O O O | margin-left: {length}
| O O O O O | margin-left: {%}
| O x O O O | margin-left: auto
| O O O O O | margin-right: {length}
| O O O O O | margin-right: {%}
| O x O O O | margin-right: auto
| O O O O O | margin-top: {length}
| O O O O O | margin-top: {%}
| O x O O O | margin-top: auto
| O x O O O | margin-bottom: {length}
| O x O O O | margin-bottom: {%}
| O x O O O | margin-bottom: auto
+-----------+
| x x o o x | overflow: scroll
| x x o o x | overflow: hidden
| x x o o x | overflow: visible
| x x o o x | overflow: auto
+-----------+
| O x O O O | padding: {length}
| O x O O O | padding: {%}
| O x O O O | padding-top: {length}
| O x O O O | padding-top: {%}
| O x O O O | padding-right: {length}
| O x O O O | padding-right: {%}
| O x O O O | padding-bottom: {length}
| O x O O O | padding-bottom: {%}
| O x O O O | padding-left: {length}
| O x O O O | padding-left: {%}
+-----------+
| x x o o x | page-break-before: auto
| x x o o x | page-break-before: always
| x x o o x | page-break-before: left
| x x o o x | page-break-before: right
+-----------+
| x x o o x | page-break-after: auto
| x x o o x | page-break-after: always
| x x o o x | page-break-after: left
| x x o o x | page-break-after: right
+-----------+
| x x O O O | position: absolute
| x x O O O | position: relative
| x x O O O | position: static
+-----------+
| O O O O O | text-align: left
| O O O O O | text-align: center
| O O O O O | text-align: right
| O x e o e | text-align: justify
+-----------+
| O O O O O | text-decoration: none
| O O O O O | text-decoration: underline
| O x O O x | text-decoration: overline
| O O O O O | text-decoration: line-through
| O x e o O | text-decoration: blink
+-----------+
| O O O O O | text-indent: {length}
| O O O O O | text-indent: {%}
+-----------+
| x x x o x | text-junsify: auto
| x x x o x | text-junsify: inter-word
| x x x o x | text-junsify: newspaper
| x x x o x | text-junsify: distribute
| x x x o x | text-junsify: distribute-all-lines
| x x x o x | text-junsify: inter-ideo-graph
+-----------+
| O x O O O | text-transform: capitalize
| O x O O O | text-transform: uppercase
| O x O O O | text-transform: lowercase
| O x O O O | text-transform: none
+-----------+
| x x O O O | top: {length}
| x x O O O | top: {%}
| x x O O O | top: auto
+-----------+
| O x O O O | vertical-align: baseline
| O x O O x | vertical-align: sub
| O x O O x | vertical-align: super
| O x O O O | vertical-align: top
| O x O O O | vertical-align: text-top
| O x O O O | vertical-align: middle
| O x O O O | vertical-align: bottom
| O x O O O | vertical-align: text-bottom
| O x x x ? | vertical-align: {%}
+-----------+
| x x O O x | visibility: visible
| x x O O x | visibility: hidden
| x x O O x | visibility: inherit
+-----------+
| O x O O e | width: {length}
| O x O O e | width: {%}
| O x O O e | width: auto
+-----------+
| O x O O x | height: {length}
| O x O O x | height: auto
+-----------+
| O x x ? O | white-space: normal
| O x x ? O | white-space: pre
| O x x ? x | white-space: nowrap
+-----------+
| O x x ? x | word-spacing: normal
| O x x ? x | word-spacing: {length}
+-----------+
| x x O O x | z-index: {number}
| x x O O x | z-index: auto
+-----------+
| x x O O x | A:hover { ... }
| O O O O O | A:link { ... }
| O x O O ? | A:active { ... }
| O x O O O | A:visited { ... }
+-----------+
| O x x ? x | P:first-line { ... }
| O x x ? x | P:first-letter { ... }
+-----------+
| O ? o o ? | !important
| O ? o o ? | @import url(...)
| x x o o x | @font-face { ... }
| x x x ? o | @fontdef url(...)
+-----------+