Can I just ask the developers if this something likely to be resolvable in the near term? The other third party sites scraped by this project all use HtmlUnit with great success, so I'm reluctant to add another dependency if it might be feasible with HtmlUnit. Thanks.
See https://sourceforge.net/p/htmlunit/bugs/2005/
Polyfill webcomponentjs is not supported
Update URL to reflect forked version
Moved to GitHub.