fix(utils): update isShadowRoot to use spec-compliant custom element regex - #5059

…ne if custom-element nodeName is valid (#5097)

Realized that I needed this for
#5041 as when trying to
create the external script and having `get-element-internals` use
`isHTMLElement` would result in the external file having all the the
different standards objects as well as a ton of unnecessary utils
functions. Thus I needed a way to determine if the element is a custom
element to short circuit the lookup in `get-element-internals` without
relying on `isHTMLElement`. This implements what we discussed in
#5059 into it's own function
so it can be used in both places.

##
[4.12.0](v4.11.4...v4.12.0)
(2026-06-01)

### Features

- add gather-internals.js external script
([#5099](#5099))
([c61d58b](c61d58b)),
closes [#5080](#5080)
- **aria-allowed/prohibited-attr, aria-required-parent/children:**
partially support element internals role
([#5080](#5080))
([417b48a](417b48a)),
closes [#5039](#5039)
[#4259](#4259)
- **axe.externalAPIs:** add public api for setting elementInternal data
([#5105](#5105))
([63bab8f](63bab8f))
- **core:** expose normalizeRunOptions
([#4998](#4998))
([b8e6a59](b8e6a59))
- expose axe.resetLocale() to restore the default locale
([#5108](#5108))
([c2b5292](c2b5292)),
closes [#5107](#5107)
- **getRules:** include rule enabled state in returned objects
([#5118](#5118))
([75bf772](75bf772)),
closes [#5116](#5116)
- **list,listitem:** support element internals role
([#5119](#5119))
([7d9d696](7d9d696))
- **new-rule:** check that aria-tab have an accessible name
([#5001](#5001))
([0d4e4e7](0d4e4e7)),
closes [#4842](#4842)
- **rules:** deprecate landmark-complementary-is-top-level rules
([#4992](#4992))
([9e09139](9e09139)),
closes [#4950](#4950)
- **utils:** add `getElementInternals` function
([#5077](#5077))
([1c15f82](1c15f82))

### Bug Fixes

- **aria-allowed-attr:** restrict br and wbr elements to aria-hidden
only ([#4974](#4974))
([c6245e7](c6245e7))
- **aria-conditional-attr:** add support for radio
([#5100](#5100))
([8223c98](8223c98))
- **aria-valid-attr-value:** handle multiple aria-errormessage IDs
([#4973](#4973))
([0489e30](0489e30))
- **aria:** prevent getOwnedVirtual from returning duplicate nodes
([#4987](#4987))
([48ca955](48ca955)),
closes [#4840](#4840)
- **commons/text:** exclude natively hidden elements from
aria-labelledby accessible name
([#5076](#5076))
([ea7202c](ea7202c)),
closes [#4704](#4704)
- **DqElement:** avoid calling constructors with cloneNode
([#5013](#5013))
([0281fa1](0281fa1))
- **existing-rule:** aria-busy now shows an error message for a use with
unallowed children
([#5017](#5017))
([2067b87](2067b87))
- **helpUrl:** ensure axe.configure always updates the help URLs
([#5114](#5114))
([c4f60ff](c4f60ff))
- **label-content-name-mismatch:** match visible text with aria-label
and exclude invisible text
([#5096](#5096))
([3a012a1](3a012a1))
- **locale:** ensure all subtags are correctly set
([#5112](#5112))
([13005ed](13005ed))
- **scrollable-region-focusable:** clarify the issue is in safari
([#4995](#4995))
([4ec5211](4ec5211)),
closes
[WebKit#190870](https://github.com/dequelabs/WebKit/issues/190870)
[WebKit#277290](https://github.com/dequelabs/WebKit/issues/277290)
- **scrollable-region-focusable:** do not fail scroll areas when all
content is visible without scrolling
([#4993](#4993))
([838707a](838707a))
- **target-size:** determine offset using clientRects if target is
display:inline
([#5012](#5012))
([a4b8091](a4b8091))
- **target-size:** ignore position: fixed elements that are offscreen
when page is scrolled
([#5066](#5066))
([1229a6e](1229a6e)),
closes [#5065](#5065)
- **target-size:** ignore widgets that are inline with other inline
elements ([#5000](#5000))
([a8dd81b](a8dd81b))
- **utils/getAncestry:** escape node name
([#5079](#5079))
([d1fabaa](d1fabaa)),
closes [#5078](#5078)
- **utils:** Add null check to parseCrossOriginStylesheet, closes
[#5074](#5074)
([#5075](#5075))
([f12ef32](f12ef32))
- **utils:** update isShadowRoot to use spec-compliant custom element
regex ([#5059](#5059))
([edc6ce2](edc6ce2)),
closes [#5030](#5030)

This PR was opened by a robot 🤖 🎉