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An array of zero or more domains on which to apply a given URL Filter rule.

This property is passed within a RuleOptions object as a parameter for URL Filter methods.


DOMString[] includeDomains


The following example blocks any content with /ads/ in the URL except from ||* and when included in pages in the domain.

  The configuration file ('config.xml').
<?xml version='1.0' encoding='utf-8'?>
<widget xmlns="">
    <feature name="opera:urlfilter"/>
// The background process (e.g. index.html)

// Check that the URL Filter API exists
if (typeof opera.extension.urlfilter != 'undefined') {
  // Assign the URLFilter object to a variable for efficiency
  var filter = opera.extension.urlfilter;


  // The following is the same as this Adblock syntax for whitelisting:
  // @@||$
  var ruleOptions = {
    includeDomains: ['']
  filter.allow.add('||*', ruleOptions);

Note the use of || which is a hostname mark. This indicates that the subsequent characters should begin matching from any host name in the URL. For example, ||* matches,, or similar. However, it will not match

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