This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

Deprecated since Gecko 57 (Firefox 57 / Thunderbird 57 / SeaMonkey 2.54)
This feature has been removed from the Web standards. Though some browsers may still support it, it is in the process of being dropped. Avoid using it and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.

The -moz-binding CSS property is used by Mozilla-based applications to attach an XBL binding to a DOM element.

Initial value none
Applies to all elements except generated content or pseudo-elements
Inherited no
Media visual
Computed value as specified
Animation type discrete
Canonical order the unique non-ambiguous order defined by the formal grammar


/* <url> value */
-moz-binding: url(http://www.example.org/xbl/htmlBindings.xml#checkbox);

/* Global values */
-moz-binding: inherited;
-moz-binding: initial;
-moz-binding: unset;


The URL for the XBL binding (including the fragment identifier).
No XBL binding is applied to the element.

Formal syntax

<url> | none


.exampleone {
  -moz-binding: url(http://www.example.org/xbl/htmlBindings.xml#radiobutton);


Not part of any specification.

Browser compatibilityUpdate compatibility data on GitHub

Chrome Edge Firefox Internet Explorer Opera Safari
Basic support No No Yes
XBL is deprecated and being removed. See bug 1397874.
No No No
Android webview Chrome for Android Edge Mobile Firefox for Android Opera for Android iOS Safari Samsung Internet
Basic support No No No ? No No No

See also

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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.