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Warn for ARIA typos on custom elements #26523

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merged 1 commit into from
Mar 30, 2023

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sebmarkbage
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Normally we allow any attribute/property on custom elements. However it's a shared namespace. The aria- namespace applies to all generic elements which are shared with custom elements. So arguably adding custom extensions there is a really bad idea since it can conflict with future additions.

It's possible there is a new standard one that's polyfilled by a custom element but the same issue applies to React in general that we might warn for very new additions so we just have to be quick on that.

cc @josepharhar

@facebook-github-bot facebook-github-bot added CLA Signed React Core Team Opened by a member of the React Core Team labels Mar 30, 2023
@sophiebits
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combine the functions?

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react-sizebot commented Mar 30, 2023

Comparing: 73deff0...9220287

Critical size changes

Includes critical production bundles, as well as any change greater than 2%:

Name +/- Base Current +/- gzip Base gzip Current gzip
oss-stable/react-dom/cjs/react-dom.production.min.js = 162.96 kB 162.96 kB = 51.35 kB 51.35 kB
oss-experimental/react-dom/cjs/react-dom.production.min.js = 164.61 kB 164.61 kB = 51.84 kB 51.84 kB
facebook-www/ReactDOM-prod.classic.js = 557.72 kB 557.72 kB = 98.34 kB 98.34 kB
facebook-www/ReactDOM-prod.modern.js = 541.42 kB 541.42 kB = 95.85 kB 95.85 kB

Significant size changes

Includes any change greater than 0.2%:

(No significant changes)

Generated by 🚫 dangerJS against 9220287

@sebmarkbage sebmarkbage force-pushed the warnforariaoncustom branch from fa37b7d to 5a66053 Compare March 30, 2023 19:52
@josepharhar
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Yeah this is probably fine, I'm not aware of anyone creating their own attributes that start with aria

Normally we allow any attribute/property on custom elements. However it's
a shared namespace. The `aria-` namespace applies to all generic elements
which are shared with custom elements. So arguably adding custom extensions
there is a really bad idea since it can conflict with future additions.

It's possible there is a new standard one that's polyfilled by a custom
element but the same issue applies to React in general that we might
warn for very new additions so we just have to be quick on that.
@sebmarkbage sebmarkbage force-pushed the warnforariaoncustom branch from 5a66053 to 9220287 Compare March 30, 2023 20:23
@sebmarkbage sebmarkbage merged commit 1a1d61f into facebook:main Mar 30, 2023
github-actions bot pushed a commit that referenced this pull request Mar 30, 2023
Normally we allow any attribute/property on custom elements. However
it's a shared namespace. The `aria-` namespace applies to all generic
elements which are shared with custom elements. So arguably adding
custom extensions there is a really bad idea since it can conflict with
future additions.

It's possible there is a new standard one that's polyfilled by a custom
element but the same issue applies to React in general that we might
warn for very new additions so we just have to be quick on that.

cc @josepharhar

DiffTrain build for [1a1d61f](1a1d61f)
facebook-github-bot pushed a commit to facebook/react-native that referenced this pull request Apr 11, 2023
Summary:
This sync includes the following changes:
- **[ca01f359b](facebook/react@ca01f359b )**: Remove skipUnmountedBoundaries ([#26489](facebook/react#26489)) //<Ricky>//
- **[43a70a610](facebook/react@43a70a610 )**: Limit the meaning of "custom element" to not include `is` ([#26524](facebook/react#26524)) //<Sebastian Markbåge>//
- **[1308e49a6](facebook/react@1308e49a6 )**: [Flight Plugin] Scan for "use client" ([#26474](facebook/react#26474)) //<dan>//
- **[1a1d61fed](facebook/react@1a1d61fed )**: Warn for ARIA typos on custom elements ([#26523](facebook/react#26523)) //<Sebastian Markbåge>//
- **[73deff0d5](facebook/react@73deff0d5 )**: Refactor DOMProperty and CSSProperty ([#26513](facebook/react#26513)) //<Sebastian Markbåge>//
- **[2d51251e6](facebook/react@2d51251e6 )**: Clean up deferRenderPhaseUpdateToNextBatch ([#26511](facebook/react#26511)) //<Andrew Clark>//
- **[0ffc7f632](facebook/react@0ffc7f632 )**: Update useMemoCache test to confirm that cache persists across errors ([#26510](facebook/react#26510)) //<Joseph Savona>//
- **[29a3be78b](facebook/react@29a3be78b )**: Move ReactDOMFloat to react-dom/src/ ([#26514](facebook/react#26514)) //<Sebastian Markbåge>//
- **[4c2fc0190](facebook/react@4c2fc0190 )**: Generate safe javascript url instead of throwing with disableJavaScriptURLs is on ([#26507](facebook/react#26507)) //<Sebastian Markbåge>//
- **[f0aafa1a7](facebook/react@f0aafa1a7 )**: Convert a few more tests to waitFor test helpers ([#26509](facebook/react#26509)) //<Andrew Clark>//
- **[90995ef8b](facebook/react@90995ef8b )**: Delete "triangle" resuming fuzz tester ([#26508](facebook/react#26508)) //<Andrew Clark>//
- **[f118b7ceb](facebook/react@f118b7ceb )**: [Flight] Gated test for dropped transport of undefined object values ([#26478](facebook/react#26478)) //<Sebastian Silbermann>//
- **[fd0511c72](facebook/react@fd0511c72 )**: [Flight] Add support BigInt support ([#26479](facebook/react#26479)) //<Sebastian Silbermann>//
- **[85de6fde5](facebook/react@85de6fde5 )**: Refactor DOM special cases per tags including controlled fields ([#26501](facebook/react#26501)) //<Sebastian Markbåge>//
- **[1f5cdf8c7](facebook/react@1f5cdf8c7 )**: Update Suspense fuzz tests to use `act` ([#26498](facebook/react#26498)) //<Andrew Clark>//
- **[f62cb39ee](facebook/react@f62cb39ee )**: Make disableSchedulerTimeoutInWorkLoop a static ff ([#26497](facebook/react#26497)) //<Ricky>//
- **[41b4714f1](facebook/react@41b4714f1 )**: Remove disableNativeComponentFrames ([#26490](facebook/react#26490)) //<Ricky>//
- **[fc90eb636](facebook/react@fc90eb636 )**: Codemod more tests to waitFor pattern ([#26494](facebook/react#26494)) //<Andrew Clark>//
- **[e0bbc2662](facebook/react@e0bbc2662 )**: Improve tests that deal with microtasks ([#26493](facebook/react#26493)) //<Andrew Clark>//
- **[8faf75193](facebook/react@8faf75193 )**: Codemod some expiration tests to waitForExpired ([#26491](facebook/react#26491)) //<Andrew Clark>//
- **[8342a0992](facebook/react@8342a0992 )**: Remove unused feature flag disableSchedulerTimeoutBasedOnReactExpirationTime ([#26488](facebook/react#26488)) //<Jan Kassens>//
- **[afea1d0c5](facebook/react@afea1d0c5 )**: [flow] make Flow suppressions explicit on the error ([#26487](facebook/react#26487)) //<Jan Kassens>//
- **[768f965de](facebook/react@768f965de )**: Suspensily committing a prerendered tree ([#26434](facebook/react#26434)) //<Andrew Clark>//
- **[d12bdcda6](facebook/react@d12bdcda6 )**: Fix Flow types of useEffectEvent ([#26468](facebook/react#26468)) //<Sebastian Silbermann>//
- **[73b6435ca](facebook/react@73b6435ca )**: [Float][Fiber] Implement waitForCommitToBeReady for stylesheet resources ([#26450](facebook/react#26450)) //<Josh Story>//
- **[175962c10](facebook/react@175962c10 )**: Fix remaining CommonJS imports after Rollup upgrade ([#26473](facebook/react#26473)) //<dan>//
- **[909c6dacf](facebook/react@909c6dacf )**: Update Rollup to 3.x ([#26442](facebook/react#26442)) //<Mark Erikson>//
- **[9c54b29b4](facebook/react@9c54b29b4 )**: Remove ReactFabricPublicInstance and used definition from ReactNativePrivateInterface ([#26437](facebook/react#26437)) //<Rubén Norte>//
- **[f77099b6f](facebook/react@f77099b6f )**: Remove layout effect warning on the server ([#26395](facebook/react#26395)) //<Ricky>//
- **[51a7c45f8](facebook/react@51a7c45f8 )**: Bugfix: SuspenseList incorrectly forces a fallback ([#26453](facebook/react#26453)) //<Andrew Clark>//
- **[afb3d51dc](facebook/react@afb3d51dc )**: Fix enableClientRenderFallbackOnTextMismatch flag ([#26457](facebook/react#26457)) //<Sebastian Markbåge>//
- **[8e17bfd14](facebook/react@8e17bfd14 )**: Make InternalInstanceHandle type opaque in ReactNativeTypes ([#26461](facebook/react#26461)) //<Rubén Norte>//
- **[b93b4f074](facebook/react@b93b4f074 )**: Should not throw for children of iframe or object ([#26458](facebook/react#26458)) //<Sebastian Markbåge>//
- **[c0b34bc5f](facebook/react@c0b34bc5f )**: chore: update links of docs and api ([#26455](facebook/react#26455)) //<Leedom>//
- **[ffb6733ee](facebook/react@ffb6733ee )**: fix docs link for useSyncExternalStore ([#26452](facebook/react#26452)) //<Valor(华洛)>//
- **[12a1d140e](facebook/react@12a1d140e )**: Don't prerender siblings of suspended component  ([#26380](facebook/react#26380)) //<Andrew Clark>//

Changelog:
[General][Changed] - React Native sync for revisions 77ba161...ca01f35

jest_e2e[run_all_tests]

bypass-github-export-checks

Reviewed By: sammy-SC

Differential Revision: D44669450

fbshipit-source-id: f160aad4719a00df3ceeca78d5f3fcd0aa0f8437
jeongshin pushed a commit to jeongshin/react-native that referenced this pull request May 7, 2023
Summary:
This sync includes the following changes:
- **[ca01f359b](facebook/react@ca01f359b )**: Remove skipUnmountedBoundaries ([facebook#26489](facebook/react#26489)) //<Ricky>//
- **[43a70a610](facebook/react@43a70a610 )**: Limit the meaning of "custom element" to not include `is` ([facebook#26524](facebook/react#26524)) //<Sebastian Markbåge>//
- **[1308e49a6](facebook/react@1308e49a6 )**: [Flight Plugin] Scan for "use client" ([facebook#26474](facebook/react#26474)) //<dan>//
- **[1a1d61fed](facebook/react@1a1d61fed )**: Warn for ARIA typos on custom elements ([facebook#26523](facebook/react#26523)) //<Sebastian Markbåge>//
- **[73deff0d5](facebook/react@73deff0d5 )**: Refactor DOMProperty and CSSProperty ([facebook#26513](facebook/react#26513)) //<Sebastian Markbåge>//
- **[2d51251e6](facebook/react@2d51251e6 )**: Clean up deferRenderPhaseUpdateToNextBatch ([facebook#26511](facebook/react#26511)) //<Andrew Clark>//
- **[0ffc7f632](facebook/react@0ffc7f632 )**: Update useMemoCache test to confirm that cache persists across errors ([facebook#26510](facebook/react#26510)) //<Joseph Savona>//
- **[29a3be78b](facebook/react@29a3be78b )**: Move ReactDOMFloat to react-dom/src/ ([facebook#26514](facebook/react#26514)) //<Sebastian Markbåge>//
- **[4c2fc0190](facebook/react@4c2fc0190 )**: Generate safe javascript url instead of throwing with disableJavaScriptURLs is on ([facebook#26507](facebook/react#26507)) //<Sebastian Markbåge>//
- **[f0aafa1a7](facebook/react@f0aafa1a7 )**: Convert a few more tests to waitFor test helpers ([facebook#26509](facebook/react#26509)) //<Andrew Clark>//
- **[90995ef8b](facebook/react@90995ef8b )**: Delete "triangle" resuming fuzz tester ([facebook#26508](facebook/react#26508)) //<Andrew Clark>//
- **[f118b7ceb](facebook/react@f118b7ceb )**: [Flight] Gated test for dropped transport of undefined object values ([facebook#26478](facebook/react#26478)) //<Sebastian Silbermann>//
- **[fd0511c72](facebook/react@fd0511c72 )**: [Flight] Add support BigInt support ([facebook#26479](facebook/react#26479)) //<Sebastian Silbermann>//
- **[85de6fde5](facebook/react@85de6fde5 )**: Refactor DOM special cases per tags including controlled fields ([facebook#26501](facebook/react#26501)) //<Sebastian Markbåge>//
- **[1f5cdf8c7](facebook/react@1f5cdf8c7 )**: Update Suspense fuzz tests to use `act` ([facebook#26498](facebook/react#26498)) //<Andrew Clark>//
- **[f62cb39ee](facebook/react@f62cb39ee )**: Make disableSchedulerTimeoutInWorkLoop a static ff ([facebook#26497](facebook/react#26497)) //<Ricky>//
- **[41b4714f1](facebook/react@41b4714f1 )**: Remove disableNativeComponentFrames ([facebook#26490](facebook/react#26490)) //<Ricky>//
- **[fc90eb636](facebook/react@fc90eb636 )**: Codemod more tests to waitFor pattern ([facebook#26494](facebook/react#26494)) //<Andrew Clark>//
- **[e0bbc2662](facebook/react@e0bbc2662 )**: Improve tests that deal with microtasks ([facebook#26493](facebook/react#26493)) //<Andrew Clark>//
- **[8faf75193](facebook/react@8faf75193 )**: Codemod some expiration tests to waitForExpired ([facebook#26491](facebook/react#26491)) //<Andrew Clark>//
- **[8342a0992](facebook/react@8342a0992 )**: Remove unused feature flag disableSchedulerTimeoutBasedOnReactExpirationTime ([facebook#26488](facebook/react#26488)) //<Jan Kassens>//
- **[afea1d0c5](facebook/react@afea1d0c5 )**: [flow] make Flow suppressions explicit on the error ([facebook#26487](facebook/react#26487)) //<Jan Kassens>//
- **[768f965de](facebook/react@768f965de )**: Suspensily committing a prerendered tree ([facebook#26434](facebook/react#26434)) //<Andrew Clark>//
- **[d12bdcda6](facebook/react@d12bdcda6 )**: Fix Flow types of useEffectEvent ([facebook#26468](facebook/react#26468)) //<Sebastian Silbermann>//
- **[73b6435ca](facebook/react@73b6435ca )**: [Float][Fiber] Implement waitForCommitToBeReady for stylesheet resources ([facebook#26450](facebook/react#26450)) //<Josh Story>//
- **[175962c10](facebook/react@175962c10 )**: Fix remaining CommonJS imports after Rollup upgrade ([facebook#26473](facebook/react#26473)) //<dan>//
- **[909c6dacf](facebook/react@909c6dacf )**: Update Rollup to 3.x ([facebook#26442](facebook/react#26442)) //<Mark Erikson>//
- **[9c54b29b4](facebook/react@9c54b29b4 )**: Remove ReactFabricPublicInstance and used definition from ReactNativePrivateInterface ([facebook#26437](facebook/react#26437)) //<Rubén Norte>//
- **[f77099b6f](facebook/react@f77099b6f )**: Remove layout effect warning on the server ([facebook#26395](facebook/react#26395)) //<Ricky>//
- **[51a7c45f8](facebook/react@51a7c45f8 )**: Bugfix: SuspenseList incorrectly forces a fallback ([facebook#26453](facebook/react#26453)) //<Andrew Clark>//
- **[afb3d51dc](facebook/react@afb3d51dc )**: Fix enableClientRenderFallbackOnTextMismatch flag ([facebook#26457](facebook/react#26457)) //<Sebastian Markbåge>//
- **[8e17bfd14](facebook/react@8e17bfd14 )**: Make InternalInstanceHandle type opaque in ReactNativeTypes ([facebook#26461](facebook/react#26461)) //<Rubén Norte>//
- **[b93b4f074](facebook/react@b93b4f074 )**: Should not throw for children of iframe or object ([facebook#26458](facebook/react#26458)) //<Sebastian Markbåge>//
- **[c0b34bc5f](facebook/react@c0b34bc5f )**: chore: update links of docs and api ([facebook#26455](facebook/react#26455)) //<Leedom>//
- **[ffb6733ee](facebook/react@ffb6733ee )**: fix docs link for useSyncExternalStore ([facebook#26452](facebook/react#26452)) //<Valor(华洛)>//
- **[12a1d140e](facebook/react@12a1d140e )**: Don't prerender siblings of suspended component  ([facebook#26380](facebook/react#26380)) //<Andrew Clark>//

Changelog:
[General][Changed] - React Native sync for revisions 77ba161...ca01f35

jest_e2e[run_all_tests]

bypass-github-export-checks

Reviewed By: sammy-SC

Differential Revision: D44669450

fbshipit-source-id: f160aad4719a00df3ceeca78d5f3fcd0aa0f8437
OlimpiaZurek pushed a commit to OlimpiaZurek/react-native that referenced this pull request May 22, 2023
Summary:
This sync includes the following changes:
- **[ca01f359b](facebook/react@ca01f359b )**: Remove skipUnmountedBoundaries ([facebook#26489](facebook/react#26489)) //<Ricky>//
- **[43a70a610](facebook/react@43a70a610 )**: Limit the meaning of "custom element" to not include `is` ([facebook#26524](facebook/react#26524)) //<Sebastian Markbåge>//
- **[1308e49a6](facebook/react@1308e49a6 )**: [Flight Plugin] Scan for "use client" ([facebook#26474](facebook/react#26474)) //<dan>//
- **[1a1d61fed](facebook/react@1a1d61fed )**: Warn for ARIA typos on custom elements ([facebook#26523](facebook/react#26523)) //<Sebastian Markbåge>//
- **[73deff0d5](facebook/react@73deff0d5 )**: Refactor DOMProperty and CSSProperty ([facebook#26513](facebook/react#26513)) //<Sebastian Markbåge>//
- **[2d51251e6](facebook/react@2d51251e6 )**: Clean up deferRenderPhaseUpdateToNextBatch ([facebook#26511](facebook/react#26511)) //<Andrew Clark>//
- **[0ffc7f632](facebook/react@0ffc7f632 )**: Update useMemoCache test to confirm that cache persists across errors ([facebook#26510](facebook/react#26510)) //<Joseph Savona>//
- **[29a3be78b](facebook/react@29a3be78b )**: Move ReactDOMFloat to react-dom/src/ ([facebook#26514](facebook/react#26514)) //<Sebastian Markbåge>//
- **[4c2fc0190](facebook/react@4c2fc0190 )**: Generate safe javascript url instead of throwing with disableJavaScriptURLs is on ([facebook#26507](facebook/react#26507)) //<Sebastian Markbåge>//
- **[f0aafa1a7](facebook/react@f0aafa1a7 )**: Convert a few more tests to waitFor test helpers ([facebook#26509](facebook/react#26509)) //<Andrew Clark>//
- **[90995ef8b](facebook/react@90995ef8b )**: Delete "triangle" resuming fuzz tester ([facebook#26508](facebook/react#26508)) //<Andrew Clark>//
- **[f118b7ceb](facebook/react@f118b7ceb )**: [Flight] Gated test for dropped transport of undefined object values ([facebook#26478](facebook/react#26478)) //<Sebastian Silbermann>//
- **[fd0511c72](facebook/react@fd0511c72 )**: [Flight] Add support BigInt support ([facebook#26479](facebook/react#26479)) //<Sebastian Silbermann>//
- **[85de6fde5](facebook/react@85de6fde5 )**: Refactor DOM special cases per tags including controlled fields ([facebook#26501](facebook/react#26501)) //<Sebastian Markbåge>//
- **[1f5cdf8c7](facebook/react@1f5cdf8c7 )**: Update Suspense fuzz tests to use `act` ([facebook#26498](facebook/react#26498)) //<Andrew Clark>//
- **[f62cb39ee](facebook/react@f62cb39ee )**: Make disableSchedulerTimeoutInWorkLoop a static ff ([facebook#26497](facebook/react#26497)) //<Ricky>//
- **[41b4714f1](facebook/react@41b4714f1 )**: Remove disableNativeComponentFrames ([facebook#26490](facebook/react#26490)) //<Ricky>//
- **[fc90eb636](facebook/react@fc90eb636 )**: Codemod more tests to waitFor pattern ([facebook#26494](facebook/react#26494)) //<Andrew Clark>//
- **[e0bbc2662](facebook/react@e0bbc2662 )**: Improve tests that deal with microtasks ([facebook#26493](facebook/react#26493)) //<Andrew Clark>//
- **[8faf75193](facebook/react@8faf75193 )**: Codemod some expiration tests to waitForExpired ([facebook#26491](facebook/react#26491)) //<Andrew Clark>//
- **[8342a0992](facebook/react@8342a0992 )**: Remove unused feature flag disableSchedulerTimeoutBasedOnReactExpirationTime ([facebook#26488](facebook/react#26488)) //<Jan Kassens>//
- **[afea1d0c5](facebook/react@afea1d0c5 )**: [flow] make Flow suppressions explicit on the error ([facebook#26487](facebook/react#26487)) //<Jan Kassens>//
- **[768f965de](facebook/react@768f965de )**: Suspensily committing a prerendered tree ([facebook#26434](facebook/react#26434)) //<Andrew Clark>//
- **[d12bdcda6](facebook/react@d12bdcda6 )**: Fix Flow types of useEffectEvent ([facebook#26468](facebook/react#26468)) //<Sebastian Silbermann>//
- **[73b6435ca](facebook/react@73b6435ca )**: [Float][Fiber] Implement waitForCommitToBeReady for stylesheet resources ([facebook#26450](facebook/react#26450)) //<Josh Story>//
- **[175962c10](facebook/react@175962c10 )**: Fix remaining CommonJS imports after Rollup upgrade ([facebook#26473](facebook/react#26473)) //<dan>//
- **[909c6dacf](facebook/react@909c6dacf )**: Update Rollup to 3.x ([facebook#26442](facebook/react#26442)) //<Mark Erikson>//
- **[9c54b29b4](facebook/react@9c54b29b4 )**: Remove ReactFabricPublicInstance and used definition from ReactNativePrivateInterface ([facebook#26437](facebook/react#26437)) //<Rubén Norte>//
- **[f77099b6f](facebook/react@f77099b6f )**: Remove layout effect warning on the server ([facebook#26395](facebook/react#26395)) //<Ricky>//
- **[51a7c45f8](facebook/react@51a7c45f8 )**: Bugfix: SuspenseList incorrectly forces a fallback ([facebook#26453](facebook/react#26453)) //<Andrew Clark>//
- **[afb3d51dc](facebook/react@afb3d51dc )**: Fix enableClientRenderFallbackOnTextMismatch flag ([facebook#26457](facebook/react#26457)) //<Sebastian Markbåge>//
- **[8e17bfd14](facebook/react@8e17bfd14 )**: Make InternalInstanceHandle type opaque in ReactNativeTypes ([facebook#26461](facebook/react#26461)) //<Rubén Norte>//
- **[b93b4f074](facebook/react@b93b4f074 )**: Should not throw for children of iframe or object ([facebook#26458](facebook/react#26458)) //<Sebastian Markbåge>//
- **[c0b34bc5f](facebook/react@c0b34bc5f )**: chore: update links of docs and api ([facebook#26455](facebook/react#26455)) //<Leedom>//
- **[ffb6733ee](facebook/react@ffb6733ee )**: fix docs link for useSyncExternalStore ([facebook#26452](facebook/react#26452)) //<Valor(华洛)>//
- **[12a1d140e](facebook/react@12a1d140e )**: Don't prerender siblings of suspended component  ([facebook#26380](facebook/react#26380)) //<Andrew Clark>//

Changelog:
[General][Changed] - React Native sync for revisions 77ba161...ca01f35

jest_e2e[run_all_tests]

bypass-github-export-checks

Reviewed By: sammy-SC

Differential Revision: D44669450

fbshipit-source-id: f160aad4719a00df3ceeca78d5f3fcd0aa0f8437
EdisonVan pushed a commit to EdisonVan/react that referenced this pull request Apr 15, 2024
Normally we allow any attribute/property on custom elements. However
it's a shared namespace. The `aria-` namespace applies to all generic
elements which are shared with custom elements. So arguably adding
custom extensions there is a really bad idea since it can conflict with
future additions.

It's possible there is a new standard one that's polyfilled by a custom
element but the same issue applies to React in general that we might
warn for very new additions so we just have to be quick on that.

cc @josepharhar
bigfootjon pushed a commit that referenced this pull request Apr 18, 2024
Normally we allow any attribute/property on custom elements. However
it's a shared namespace. The `aria-` namespace applies to all generic
elements which are shared with custom elements. So arguably adding
custom extensions there is a really bad idea since it can conflict with
future additions.

It's possible there is a new standard one that's polyfilled by a custom
element but the same issue applies to React in general that we might
warn for very new additions so we just have to be quick on that.

cc @josepharhar

DiffTrain build for commit 1a1d61f.
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