<p></p>
<p>Having now tried on my machine, where I use the upstream phantomjs I think I have a better handle on what happened.</p>
<p>The upstream phantomjs actually only has one backend, namely the <code>phantom</code> one, so that is why I tried to make <code>offscreen</code> conditional. It seems however that, probably as a result of trying various alternatives, I accidentally changed what it was setting the value to at the same time.</p>

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