The "Source" tab in the Info panel shows the (generated) HTML source of the current page. Polypane automatically formats and highlights the source so even if you minify your HTML, it will be readable. When the source contains invalid HTML, Polypane wont be able to format it.
Sections are collapsible so you can quickly scroll through the source. By default full words are selected, but you can doubleclick to select entire lines for easy copying.
You can reload this view with the reload button in the panel.
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