<details> element does not show triangle in Firefox
<details> element does not show a triangle in Firefox (Click me to collapse/fold in the screenshots below):
| Chrome | Firefox |
|---|---|
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(https://docs.gitlab.com/ce/user/markdown.html#details-and-summary)
The solution seems to be display: list-item for the <summary> element:
Fully standards-compliant implementations automatically apply the CSS
display: list-itemto the<summary>element.
(https://developer.mozilla.org/en-US/docs/Web/HTML/Element/details)

