Double-clicking on an entry . . . Is this a screenshot?

When I double-clicked on an entry, Zotero shows what it appears to be a screenshot of the webpage of the paper. I imported this entry from a journal website. Since my institution doesn't subscribe to this journal, the PDF version wasn't imported. Then, double-clicking on the entry on Zotero shows the screenshot-like thing. It's not a pixmap. The hyperlinks on the screenshot are active and the text is selectable.

I like it, but how does this work? Does Zotero automatically take an HTML screenshot?
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