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Robert Knight authoredAdd a workaround for the scroll-into-view package for XHTML documents, including EPUBs. In these documents `scrollIntoView` failed to detect the <body> element correctly when finding scrollable ancestors of the target element. As a result the client did not scroll to the correct location for a highlight when clicking on annotation cards or bucket bar items. The workaround is to make `document.body.tagName` behave the same in XHTML documents as it does in HTML documents, and rely on this being unlikely to break any of the page's own JavaScript.
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