Changes

<input type="hidden" name="domains" value="en.wikipedia.org" />

<input type="hidden" name="domains" value="en.wikipedia.org" />

<br>Wikipedia

<br>Wikipedia

<input type=radio name=sitesearch value="">

<input type=radio value="">

<br>Web

<br>Web

<input type=radio name=sitesearch value="en.wikipedia.org" checked/>

<input type=radio name=sitesearch value="en.wikipedia.org" checked/>