fix(isVisible): treat <summary> in closed <details> as visible

[AhmadHannan037]

Fixes #2626.

isVisible() previously returned false for <summary> (and <details> itself) when the parent <details> had no open attribute, even though the browser renders both. The check now mirrors HTML semantics: only non-

descendants of a closed <details> are hidden.

<details> (open or closed) → visible
<summary> (direct child) → visible
Other descendants → visible only when open
Tests added in tests/isVisible.spec.ts covering the open, closed, and nested-non-summary cases.

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[cexbrayat]

Hi @AhmadHannan037

Thanks for the PR, but we already have one opened to solve the same issue in #2806 that we are going to prioritize.
Feel free to take a look at the other PR and suggest improvements

[AhmadHannan037]

Hi @AhmadHannan037

Thanks for the PR, but we already have one opened to solve the same issue in #2806 that we are going to prioritize. Feel free to take a look at the other PR and suggest improvements

Going to close this since #2806 is already addressing the issue and is further along in review. Happy to help review there. Thanks!