Firefox (-moz-) vendor-prefixed CSS extensions

A {{glossary("vendor prefix")}}  is used to indicate that a feature is specific to a certain browser. Firefox supports several extensions to CSS, which are prefixed with -moz-.

-moz-prefixed properties without standard equivalents

[!NOTE] These extensions are mostly experimental or deprecated but kept for backward compatibility. You should avoid using them on production websites.

• {{CSSxRef("-moz-float-edge")}}  {{deprecated_inline}} 
• {{CSSxRef("-moz-force-broken-image-icon")}}  {{deprecated_inline}} : Use alt text instead.
• {{CSSxRef("-moz-orient")}} 
• -moz-osx-font-smoothing: A similar {{CSSxRef("font-smooth")}}  equivalent exists.
• {{CSSxRef("-moz-user-focus")}}  {{deprecated_inline}} 
• {{CSSxRef("-moz-user-input")}}  {{deprecated_inline}} 
• -moz-user-modify: A non-prefixed {{CSSxRef("user-modify")}}  equivalent exists, but the HTML contenteditable attribute is recommended instead.

-moz-prefixed properties with standard equivalents

The following properties were implemented first using the -moz- vendor prefix, but are now supported in Firefox using the standard (non-prefixed) syntax. Support for the prefixed version is typically dropped eventually, so use the standard property instead.

A

• {{CSSxRef("animation", "-moz-animation")}}  {{deprecated_inline}} : Prefixed version still supported.
• {{CSSxRef("animation-delay", "-moz-animation-delay")}}  {{deprecated_inline}} : Prefixed version still supported.
• {{CSSxRef("animation-direction", "-moz-animation-direction")}}  {{deprecated_inline}} : Prefixed version still supported.
• {{CSSxRef("animation-duration", "-moz-animation-duration")}}  {{deprecated_inline}} : Prefixed version still supported.
• {{CSSxRef("animation-fill-mode", "-moz-animation-fill-mode")}}  {{deprecated_inline}} : Prefixed version still supported.
• {{CSSxRef("animation-iteration-count", "-moz-animation-iteration-count")}}  {{deprecated_inline}} : Prefixed version still supported.
• {{CSSxRef("animation-name", "-moz-animation-name")}}  {{deprecated_inline}} : Prefixed version still supported.
• {{CSSxRef("animation-play-state", "-moz-animation-play-state")}}  {{deprecated_inline}} : Prefixed version still supported.
• {{CSSxRef("animation-timing-function", "-moz-animation-timing-function")}}  {{deprecated_inline}} : Prefixed version still supported.
• -moz-appearance: The prefixed version of {{CSSxRef("appearance")}}  is still supported.

B

• {{CSSxRef("backface-visibility", "-moz-backface-visibility")}}  {{deprecated_inline}} : Prefixed version still supported.
• -moz-background-clip {{deprecated_inline}} : Not supported; use {{CSSxRef("background-clip")}} .
• -moz-background-origin {{deprecated_inline}} : Not supported; use {{CSSxRef("background-origin")}} .
• -moz-box-align {{deprecated_inline}} : Use CSS flexbox with {{CSSxRef("align-items")}} .
• -moz-background-inline-policy {{deprecated_inline}} : Not supported; use {{CSSxRef("box-decoration-break")}} .
• -moz-box-direction {{deprecated_inline}} : Use CSS flexbox with {{CSSxRef("flex-direction")}} .
• -moz-box-flex {{deprecated_inline}} : Use CSS flexbox with {{CSSxRef("flex-grow")}} .
• -moz-box-ordinal-group {{deprecated_inline}} : Use CSS flexbox with {{CSSxRef("order")}} .
• -moz-box-orient {{deprecated_inline}} : Use CSS flexbox with {{CSSxRef("flex-direction")}} .
• -moz-box-pack {{deprecated_inline}} : Use CSS flexbox with {{CSSxRef("justify-content")}} .
• -moz-background-size {{deprecated_inline}} : Not supported; use {{CSSxRef("background-size")}} .
• -moz-border-end {{deprecated_inline}} : Not supported; use {{CSSxRef("border-inline-end")}} .
• -moz-border-end-color {{deprecated_inline}} : Not supported; use {{CSSxRef("border-inline-end-color")}} .
• -moz-border-end-style {{deprecated_inline}} : Not supported; use {{CSSxRef("border-inline-end-style")}} .
• -moz-border-end-width {{deprecated_inline}} : Not supported; use {{CSSxRef("border-inline-end-width")}} .
• -moz-border-image {{deprecated_inline}} : Not supported; use {{CSSxRef("border-inline-end-width")}} .
• -moz-border-start {{deprecated_inline}} : Not supported; use {{CSSxRef("border-inline-start")}} .
• -moz-border-start-color {{deprecated_inline}} : Not supported; use {{CSSxRef("border-inline-start-color")}} .
• -moz-border-start-style {{deprecated_inline}} : Not supported; use {{CSSxRef("border-inline-start-style")}} .
• -moz-border-start-width {{deprecated_inline}} : Not supported; use {{CSSxRef("border-inline-start-width")}} .
• {{CSSxRef("box-sizing", "-moz-box-sizing")}}  {{deprecated_inline}} : Prefixed version still supported.

C

• -moz-column-count {{deprecated_inline}} : Not supported; use {{CSSxRef("column-count")}} .
• -moz-column-fill {{deprecated_inline}} : Not supported; use {{CSSxRef("column-fill")}} .
• -moz-column-gap {{deprecated_inline}} : Not supported; use {{CSSxRef("column-gap")}} .
• -moz-column-width {{deprecated_inline}} : Not supported; use {{CSSxRef("column-width")}} .
• -moz-column-rule {{deprecated_inline}} : Not supported; use {{CSSxRef("column-rule")}} .
• -moz-column-rule-width {{deprecated_inline}} : Not supported; use {{CSSxRef("column-rule-width")}} .
• -moz-column-rule-style {{deprecated_inline}} : Not supported; use {{CSSxRef("column-rule-style")}} .
• -moz-column-rule-color {{deprecated_inline}} : Not supported; use {{CSSxRef("column-rule-color")}} .

F–M

• {{CSSxRef("font-feature-settings", "-moz-font-feature-settings")}}  {{deprecated_inline}} : Prefixed version still supported.
• {{CSSxRef("font-language-override", "-moz-font-language-override")}}  {{deprecated_inline}} : Prefixed version still supported.
• {{CSSxRef("hyphens", "-moz-hyphens")}}  {{deprecated_inline}} : Prefixed version still supported.
• -moz-margin-end {{deprecated_inline}} : Not supported; use {{CSSxRef("margin-inline-end")}} .
• -moz-margin-start {{deprecated_inline}} : Not supported; use {{CSSxRef("margin-inline-start")}} .

O-P

• -moz-opacity {{deprecated_inline}} : Not supported; use {{CSSxRef("opacity")}} .
• -moz-outline {{deprecated_inline}} : Not supported; use {{CSSxRef("outline")}} .
• -moz-outline-color {{deprecated_inline}} : Not supported; use {{CSSxRef("outline-color")}} .
• -moz-outline-offset {{deprecated_inline}} : Not supported; use {{CSSxRef("outline-offset")}} .
• -moz-outline-style {{deprecated_inline}} : Not supported; use {{CSSxRef("outline-style")}} .
• -moz-outline-width {{deprecated_inline}} : Not supported; use {{CSSxRef("outline-width")}} .
• -moz-padding-end {{deprecated_inline}} : Not supported; use {{CSSxRef("padding-inline-end")}} .
• -moz-padding-start {{deprecated_inline}} : Not supported; use {{CSSxRef("padding-inline-start")}} .
• {{CSSxRef("perspective", "-moz-perspective")}}  {{deprecated_inline}} : Prefixed version still supported.
• {{CSSxRef("perspective-origin", "-moz-perspective-origin")}}  {{deprecated_inline}} : Prefixed version still supported.

T–Z

• -moz-tab-size: Use {{CSSxRef("tab-size")}} 
• -moz-text-align-last {{deprecated_inline}} : Not supported; use {{CSSxRef("text-align-last")}} .
• -moz-text-decoration-color {{deprecated_inline}} : Not supported; use {{CSSxRef("text-decoration-color")}} .
• -moz-text-decoration-line {{deprecated_inline}} : Not supported; use {{CSSxRef("text-decoration-line")}} .
• -moz-text-decoration-style {{deprecated_inline}} : Not supported; use {{CSSxRef("text-decoration-style")}} .
• -moz-text-size-adjust: See {{CSSxRef("text-size-adjust")}}  {{Experimental_Inline}} .
• {{CSSxRef("transform", "-moz-transform")}}  {{deprecated_inline}} : Prefixed version still supported.
• {{CSSxRef("transform-origin", "-moz-transform-origin")}}  {{deprecated_inline}} : Prefixed version still supported.
• {{CSSxRef("transform-style", "-moz-transform-style")}}  {{deprecated_inline}} : Prefixed version still supported.
• -moz-transition {{deprecated_inline}} : Not supported; use {{CSSxRef("transition")}} .
• -moz-transition-delay {{deprecated_inline}} : Not supported; use {{CSSxRef("transition-delay")}} .
• -moz-transition-duration {{deprecated_inline}} : Not supported; use {{CSSxRef("transition-duration")}} .
• -moz-transition-property {{deprecated_inline}} : Not supported; use {{CSSxRef("transition-property")}} .
• -moz-transition-timing-function {{deprecated_inline}} : Not supported; use {{CSSxRef("transition-timing-function")}} .
• -moz-user-select: Use {{CSSxRef("user-select")}} .

-moz-prefixed property values

Global values

• -moz-initial: See {{CSSxRef("initial")}} .

background-image

Property: {{CSSxRef("background-image")}} 

• -moz-linear-gradient {{deprecated_inline}} : Use {{CSSxRef("gradient/linear-gradient")}} .
• -moz-radial-gradient {{deprecated_inline}} : Use {{CSSxRef("gradient/radial-gradient")}} .
• -moz-element {{deprecated_inline}} : Use {{CSSxRef("element")}} .
• {{CSSxRef("-moz-image-rect")}}  {{deprecated_inline}} 

order-style and outline-style

Properties: {{CSSxRef("border-style")}}  and {{CSSxRef("outline-style")}} .

• -moz-bg-inset {{deprecated_inline}} 
• -moz-bg-outset {{deprecated_inline}} 
• -moz-bg-solid {{deprecated_inline}} 

<color> keywords

Type: {{CSSxRef("<color>")}} 

• -moz-activehyperlinktext
• -moz-hyperlinktext
• -moz-visitedhyperlinktext
• -moz-buttonhoverface
• -moz-buttonhovertext
• -moz-default-background-color
• -moz-default-color
• -moz-cellhighlight
• -moz-cellhighlighttext
• -moz-field
• -moz-fieldtext
• -moz-dialog
• -moz-dialogtext
• -moz-menuhover
• -moz-menuhovertext

empty-cells

Property: {{CSSxRef("empty-cells")}} 

• -moz-show-background (default value in quirks mode)

font-family

Property: {{CSSxRef("font-family")}} 

• -moz-fixed

image-rendering

Property: {{CSSxRef("image-rendering")}} 

• -moz-crisp-edges {{deprecated_inline}} : Use crisp-edges.

<length>

Type: {{CSSxRef("<length>")}} 

• -moz-calc``{{deprecated_inline}} : Use {{CSSxRef("calc")}} .

list-style-type

Property: {{CSSxRef("list-style-type")}} 

Several vendor-prefixed values for list-style-type are now supported as standard values without a -moz- prefix, except for those in the following list. See Browser Compatibility for details.

• -moz-ethiopic-halehame
• -moz-ethiopic-halehame-am
• -moz-ethiopic-halehame-ti-er
• -moz-ethiopic-halehame-ti-et
• -moz-hangul
• -moz-hangul-consonant
• -moz-urdu

text-align

Property: {{CSSxRef("text-align")}} 

• -moz-center {{deprecated_inline}} : Use {{CSSxRef("text-align", "text-align: center")}} .
• -moz-left {{deprecated_inline}} : Use {{CSSxRef("text-align", "text-align: left")}} .
• -moz-right {{deprecated_inline}} : Use {{CSSxRef("text-align", "text-align: right")}} .

width, min-width, and max-width

Properties: {{CSSxRef("width")}} , {{CSSxRef("min-width")}} , and {{CSSxRef("max-width")}} 

• -moz-min-content: See {{CSSxRef("min-content")}} .
• -moz-fit-content: See {{CSSxRef("fit-content")}} .
• -moz-max-content: See {{CSSxRef("max-content")}} .
• -moz-available: See stretch.

Pseudo-classes

• :-moz-any {{deprecated_inline}} : Use {{CSSxRef(":is")}} .
• :-moz-any-link {{deprecated_inline}} : Use {{CSSxRef(":any-link")}} .
• {{CSSxRef(":-moz-broken")}}  {{deprecated_inline}} 
• {{CSSxRef(":-moz-drag-over")}} 
• {{CSSxRef(":-moz-first-node")}} 
• :-moz-full-screen {{deprecated_inline}} : Not supported; use {{CSSxRef(":fullscreen")}} .
• :-moz-full-screen-ancestor {{deprecated_inline}} : Not supported; use {{CSSxRef(":fullscreen")}} .
• {{CSSxRef(":-moz-handler-blocked")}} 
• {{CSSxRef(":-moz-handler-crashed")}} 
• {{CSSxRef(":-moz-handler-disabled")}} 
• {{CSSxRef(":-moz-last-node")}} 
• {{CSSxRef(":-moz-loading")}} 
• {{CSSxRef(":-moz-locale-dir_ltr", ":-moz-locale-dir(ltr)")}} 
• {{CSSxRef(":-moz-locale-dir_rtl", ":-moz-locale-dir(rtl)")}} 
• :-moz-native-anonymous
• :-moz-placeholder {{deprecated_inline}} : Use {{CSSxRef(":placeholder-shown")}} .
• {{CSSxRef(":-moz-only-whitespace")}} 
• :-moz-read-only {{deprecated_inline}} : Use {{CSSxRef(":read-only")}} .
• :-moz-read-write {{deprecated_inline}} : Use {{CSSxRef(":read-write")}} .
• {{CSSxRef(":-moz-submit-invalid")}} : See {{CSSxRef(":invalid")}} .
• {{CSSxRef(":-moz-suppressed")}} 
• :-moz-ui-invalid {{deprecated_inline}} : Use {{CSSxRef(":user-invalid")}} .
• :-moz-ui-valid {{deprecated_inline}} : Use {{CSSxRef(":user-valid")}} .
• {{CSSxRef(":-moz-user-disabled")}} 
• {{CSSxRef(":-moz-window-inactive")}} 

Pseudo-elements

• ::-moz-canvas
• ::-moz-cell-content
• {{CSSxRef("::-moz-color-swatch")}} 
• {{CSSxRef("::-moz-focus-inner")}} 
• ::-moz-focus-outer
• ::-moz-inline-table
• {{CSSxRef("::-moz-list-bullet")}} 
• {{CSSxRef("::-moz-list-number")}} 
• {{CSSxRef("::-moz-meter-bar")}} 
• ::-moz-pagebreak
• ::-moz-pagecontent
• ::-moz-placeholder {{deprecated_inline}} : Use {{CSSxRef("::placeholder")}} .
• {{CSSxRef("::-moz-progress-bar")}} 
• {{CSSxRef("::-moz-range-progress")}} 
• {{CSSxRef("::-moz-range-thumb")}} 
• {{CSSxRef("::-moz-range-track")}} 
• ::-moz-scrolled-canvas
• ::-moz-scrolled-content
• ::-moz-selection {{deprecated_inline}} : Use {{CSSxRef("::selection")}} .
• ::-moz-svg-foreign-content
• ::-moz-table
• ::-moz-table-cell
• ::-moz-table-column
• ::-moz-table-column-group
• ::-moz-table-outer
• ::-moz-table-row
• ::-moz-table-row-group
• ::-moz-viewport
• ::-moz-viewport-scroll

At-rules

• {{CSSxRef("@document", "@-moz-document")}} 

Media features

• {{CSSxRef("@media/-moz-device-pixel-ratio", "-moz-device-pixel-ratio")}}  {{deprecated_inline}} 
• -moz-platform
• -moz-windows-glass

Other

• -moz-alt-content: See Firefox bug 11011

See also

• WebKit (-webkit-) vendor-prefixed CSS extensions
• {{glossary("Vendor Prefix")}}  glossary entry