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XBL

• Extensible Bindings Language
• Called XBL: pronounced “zibble” or X-B-L
• 'Bind' content, layout and behaviour to new widget
• Example

  
  <binding id="popup" 
    extends="chrome://global/content/bindings/popup.xml#popup-base">
      <content>
        <xul:arrowscrollbox class="popup-internal-box" flex="1" 
          orient="vertical">
          <children/>
        </xul:arrowscrollbox>
      </content>
   
      <implementation 
        implements="nsIDOMXULPopupElement, nsIAccessibleProvider">
          ...
      </implementation>
  </binding>
  
  

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