Test https://github.com/web-platform-tests/wpt/pull/12810 Firefox renders as expected. WebKit and Chrome put the X and the Y on separate lines. Edge puts the X above the legend.
Also see https://github.com/web-platform-tests/wpt/pull/12939
Safari Technology Preview 154 is still failing test: https://wpt.fyi/results/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/fieldset-content-before-legend.html?label=master&label=experimental&aligned&view=subtest&q=fieldset-content-before-legend.html >> fieldset content before legend Updated "Keyword" field and also adding test URL for ease to track this.