XBL

XBL ( XML Binding Language ) is an XML -based markup language for altering the behavior of XUL widgets . It was devised at Netscape in the late 1990s as an extension of XUL. ^{[1] [2]}

The primary use of XBL was in the Firefox web browser , but Mozilla deprecated it in 2017 and completely removed it from Firefox in 2019. ^{[3] [4]} However, the UXP fork of Firefox intends to continue supporting XBL indefinitely. ^[5]

Mozilla attempted to standardize XBL 2.0 via W3C in 2007, ^[6] but due to lack of interest from other web browser vendors, abandoned it in 2012. ^[7]

The Shadow DOM specification acknowledges XBL as a strong influence. ^[8]

Overview [ edit ]

XUL defines the user interface layout of an application . CSS rules can be used to change the appearance of various XUL elements. But XBL is needed to alter the behavior of a XUL widget, such as a scroll bar .

An XBL file contains bindings , each of which describes the behavior of a XUL widget. The root element of an XBL file is the <bindings> element, which contains one or more <binding> elements. Each <binding> element declares one binding, which can be attached to any XUL element. It may also possess an id attribute. A binding is assigned to an element by setting the CSS property -moz-binding to the URL of the binding's file. For example:

scrollbar
 {

  -moz-
binding
:
 url
(
'somefile.xml#binding1'
);

}

See also [ edit ]

• sXBL , an XBL alternative for SVG

References [ edit ]