In places where an invalid key is used to accessed a named value, Tapestry 
should report the possible names better (using HTML lists, rather than a long 
comma-separated string)
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                 Key: TAP5-1035
                 URL: https://issues.apache.org/jira/browse/TAP5-1035
             Project: Tapestry 5
          Issue Type: New Feature
          Components: tapestry-core
    Affects Versions: 5.2.0
            Reporter: Howard M. Lewis Ship


When you use an invalid name, such as a misspelling of a component type, 
Tapestry is great about listing out the possible names you could have used.  
However, when there's a lot of those (such as a service id, or a component 
type, or  page name in a large application), the format is hard to parse: long, 
long, long comma-separated list.

A better approach would be to use two or three columns of <ul> and <li> 
elements to present the options in a useful order.

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