Support `<summary>` as a focusable element

[shengslogar]

• <summary> is a built-in heading tag that is nested inside a <details> tag to toggle its contents. It's keyboard tab-able by default and not currently recognized by Headless UI.
• There are no attributes that disable a summary tag, and adding tabindex="-1" makes it behave like any other normally-tab-able element.
• I didn't spot any tests that specifically check for tab-ability of elements outside of buttons and inputs. Let me know if I missed anything.

[vercel[bot]]

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Project	Deployment	Preview	Comments	Updated (UTC)
headlessui-react	Ready	Preview	Comment	Sep 3, 2025 11:38am
headlessui-vue	Ready	Preview	Comment	Sep 3, 2025 11:38am

[shengslogar]

Should input type="hidden" also be on this list? From what I can tell logic will automatically loop past it either way.