TextPanel: Fix <summary> styling missing the disclosure triangle #70133
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Fixes styling of summary/details HTML tags where the the 'disclosure triangle' on the clickable summary was missing.
<summary>
should be by defaultdisplay: list-item
(TIL!), where it will get that chevron. The (very old) normalize stylesheet was resetting it's display to block to support old browsers. https://developer.mozilla.org/en-US/docs/Web/HTML/Element/details#customizing_the_disclosure_widgetFixes #69661