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Dont assume head exists
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@ -256,7 +256,7 @@ class PreviewIntegration:
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if window is window.top:
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setTimeout(self.connect_channel, 10)
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document.body.addEventListener('click', self.onclick, True)
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document.head.appendChild(E.style(
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document.documentElement.appendChild(E.style(
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type='text/css',
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'[data-in-split-mode="1"] [data-is-block="1"]:hover { cursor: pointer !important; border-top: solid 5px green !important }'
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))
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