WebKit supports a number of extensions to CSS that are prefixed with -webkit. All -webkit prefixed properties also work with an -apple prefix.
Some of these properties have been included in draft CSS specification for inclusion in the final recommendation, but are still experimental. Some of these non-standard properties are not on the standard track
WebKit-prefixed entities on the standard track
A – C
-webkit-column-count-webkit-column-gap-webkit-column-width-webkit-column-rule-webkit-column-rule-width-webkit-column-rule-style-webkit-column-rule-color-webkit-columns-webkit-column-span
F
-webkit-font-feature-settings-webkit-font-kerning-webkit-font-size-delta-webkit-font-variant-ligatures
G
H – O
M
-webkit-mask-webkit-mask-clip-webkit-mask-composite-webkit-mask-image-webkit-mask-origin-webkit-mask-position-webkit-mask-repeat-webkit-mask-size
P
Q – Z
WebKit-prefixed entities with an unprefixed counterpart
In order to maximize the compatibility of your CSS, you shouldn't use these prefixed version of standard properties: the shorter unprefixed version should be used in all cases.
A
-webkit-animation-webkit-animation-delay-webkit-animation-direction-webkit-animation-duration-webkit-animation-fill-mode-webkit-animation-iteration-count-webkit-animation-name-webkit-animation-play-state-webkit-animation-timing-function
B
-webkit-backface-visibility-webkit-background-clip-webkit-background-origin-webkit-background-size-webkit-border-bottom-left-radius-webkit-border-bottom-right-radius-webkit-border-image-webkit-border-radius-webkit-border-top-left-radius-webkit-border-top-right-radius-webkit-box-sizing
C – N
O – S
T – Z
Proprietary WebKit-prefixed entities (do not use on Web sites)
A
B
-webkit-background-compositebackground-origin-x(unprefixed!)background-origin-y(unprefixed!)-webkit-border-after-webkit-border-after-color-webkit-border-after-style-webkit-border-after-width-webkit-border-before-webkit-border-before-color-webkit-border-before-style-webkit-border-before-width-webkit-border-end-webkit-border-end-color-webkit-border-end-style-webkit-border-end-width-webkit-border-fit-webkit-border-horizontal-spacing-webkit-border-start-webkit-border-start-color-webkit-border-start-style-webkit-border-start-width-webkit-border-vertical-spacing-webkit-box-align-webkit-box-direction-webkit-box-flex-webkit-box-flex-group-webkit-box-lines-webkit-box-ordinal-group-webkit-box-orient-webkit-box-pack-webkit-box-reflect-webkit-box-shadow
C
-webkit-column-axis-webkit-column-break-after-webkit-column-break-before-webkit-column-break-inside
D E
F
G
H – K
-webkit-highlight-webkit-hyphenate-charset-webkit-hyphenate-limit-after-webkit-hyphenate-limit-before-webkit-hyphenate-limit-lines
L
-webkit-line-align-webkit-line-box-contain-webkit-line-break-webkit-line-clamp-webkit-line-grid-webkit-line-snap-webkit-locale-webkit-logical-height-webkit-logical-width
M
-webkit-margin-after-webkit-margin-after-collapse-webkit-margin-before-webkit-margin-before-collapse-webkit-margin-bottom-collapse-webkit-margin-collapse-webkit-margin-end-webkit-margin-start-webkit-margin-top-collapse-webkit-marquee-webkit-marquee-direction-webkit-marquee-increment-webkit-marquee-repetition-webkit-marquee-speed-webkit-marquee-style-webkit-mask-attachment-webkit-mask-box-image-webkit-mask-box-image-outset-webkit-mask-box-image-repeat-webkit-mask-box-image-slice-webkit-mask-box-image-source-webkit-mask-box-image-width-webkit-mask-position-x-webkit-mask-position-y-webkit-mask-repeat-x-webkit-mask-repeat-y-webkit-match-nearest-mail-blockquote-color-webkit-max-logical-height-webkit-max-logical-width-webkit-min-logical-height-webkit-min-logical-width
N
O
P Q
-webkit-padding-after-webkit-padding-before-webkit-padding-end-webkit-padding-start-webkit-perspective-origin-x-webkit-perspective-origin-y-webkit-print-color-adjust
R
-webkit-region-break-after-webkit-region-break-before-webkit-region-break-inside-webkit-rtl-ordering
S
T – Z
-webkit-tap-highlight-color-webkit-text-combine-epub-text-combine-webkit-text-decorations-in-effect-epub-text-emphasis-epub-text-emphasis-color-epub-text-emphasis-style-webkit-text-fill-color-epub-text-orientation-webkit-text-security-webkit-text-size-adjust-webkit-text-stroke-webkit-text-stroke-color-webkit-text-stroke-width-webkit-touch-callout
See also
- Styling Form Controls on the WebKit Trac
- Quite a few extension not listed above: https://gist.github.com/afabbro/3759334