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At the same time, Tapestry wants to position the <input> field in a valid location, and HTML defines some constraints for that; an input field must appear inside a <p> or <div> element. In your empty Zone, there's no place to put the hidden element.

The solution is to add the following a <div> element to the body of your Zone:

<div class="t-invisible"/>

This the zone; this ensures that there's a place for the hidden input field. The "t-invisible" CSS class ensures that the <div> does not display or otherwise affect layout.

{scrollbar}