atternList.
 <li>If the first pattern is an extension pattern, only exact patterns that are matched by the first pattern and
 path-prefix patterns may occur in the URLPatternList.
 <li>If the first pattern is the default pattern, "/", any pattern except the default pattern may occur in the
 URLPatternList.
 <li>If the first pattern is an exact pattern a URLPatternList must not be present in the URLPatternSpec.
 </ul>

 <p>
 The actions parameter contains a comma separated list of HTTP methods. The syntax of