wps-js is an open source client library for connecting Javascript client to OGC Web Processing services. This page demonstrates how you can use it. More documentation is available in the 52°North Wiki and on GitHub.
Based on wps-js-0.1 | © 2014 52°North
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), and execute the process. The result server does not allow CORS requests, so you have to copy and paste the URL in the error message to a new browser window.