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Browsers seem to have this rule in their user agent stylesheet: fieldset { display: block; } However, chapter 14 Rendering does not mention it. It should be added to 14.3.13 The fieldset and legend elements.
Checked in as WHATWG revision r8842. Check-in comment: Make <fieldset> display:block to match implementations https://html5.org/tools/web-apps-tracker?from=8841&to=8842