CSS issue in Firefox: <summary> arrow marker hidden due to display: block · Issue #29 · timarney/react-faq · GitHub
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Displaying <summary> as block in normalize.css leads to missing ::marker icon in Chrome [#3204918] | Drupal.org
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How To Use The < summary > And < details > Tags To Make An Interactive Cheeseburger With HTML / CSS | Justin Woodie | Blog
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