third_party/web_platform_tests/WebIDL/valid/xml/operation-optional-arg.widlprocxml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE Definitions SYSTEM "widlprocxml.dtd">
<Definitions>
  <webidl>interface ColorCreator {
  object createColor(float v1, float v2, float v3, optional float alpha = 3.5);
};</webidl>
  <Interface name="ColorCreator" id="::ColorCreator">
    <webidl>interface ColorCreator {
  object createColor(float v1, float v2, float v3, optional float alpha = 3.5);
};</webidl>
    <Operation name="createColor" id="::ColorCreator::createColor">
      <webidl>  object createColor(float v1, float v2, float v3, optional float alpha = 3.5);</webidl>
      <Type type="object"/>
      <ArgumentList>
        <Argument name="v1">
          <Type type="float"/>
        </Argument>
        <Argument name="v2">
          <Type type="float"/>
        </Argument>
        <Argument name="v3">
          <Type type="float"/>
        </Argument>
        <Argument optional="optional" name="alpha" value="3.5">
          <Type type="float"/>
        </Argument>
      </ArgumentList>
    </Operation>
  </Interface>
</Definitions>