React + Custom Elements

Version: ^19

Browser: Chrome Headless 138.0.0.0 (Linux x86_64)

Timestamp: 8/10/2025, 5:06:19 PM

16 tests / 0 errors / 0 failures / 0 skipped / runtime: 0.235s

basic support

no children
can display a Custom Element with no children

Passed in 0.052s

with children
can display a Custom Element with children in a Shadow Root

Passed in 0.01s

with children
can display a Custom Element with children in a Shadow Root and pass in Light DOM children

Passed in 0.036s

with children
can display a Custom Element with children in the Shadow DOM and handle hiding and showing the element

Passed in 0.029s

attributes and properties
will pass boolean data as either an attribute or a property

Passed in 0.008s

attributes and properties
will pass numeric data as either an attribute or a property

Passed in 0.003s

attributes and properties
will pass string data as either an attribute or a property

Passed in 0.01s

events
can imperatively listen to a DOM event dispatched by a Custom Element

Passed in 0.007s

advanced support

attributes and properties
will pass array data as a property

Passed in 0.015s

attributes and properties
will pass object data as a property

Passed in 0.018s

attributes and properties
will pass object data to a camelCase-named property

Passed in 0.001s

events
can declaratively listen to a lowercase DOM event dispatched by a Custom Element

Passed in 0.019s

events
can declaratively listen to a kebab-case DOM event dispatched by a Custom Element

Passed in 0.015s

events
can declaratively listen to a camelCase DOM event dispatched by a Custom Element

Passed in 0.001s

events
can declaratively listen to a CAPScase DOM event dispatched by a Custom Element

Passed in 0.001s

events
can declaratively listen to a PascalCase DOM event dispatched by a Custom Element

Passed in 0.01s

System output:
Chrome Headless 138.0.0.0 (Linux x86_64) ERROR: '`ReactDOMTestUtils.act` is deprecated in favor of `React.act`. Import `act` from `react` instead of `react-dom/test-utils`. See https://react.dev/warnings/react-dom-test-utils for more info.'

Version: ^19

Browser: FirefoxHeadless

Timestamp: 8/10/2025, 5:06:31 PM

16 tests / 0 errors / 0 failures / 0 skipped / runtime: 0.149s

basic support

no children
can display a Custom Element with no children

Passed in 0.052s

with children
can display a Custom Element with children in a Shadow Root

Passed in 0.005s

with children
can display a Custom Element with children in a Shadow Root and pass in Light DOM children

Passed in 0.021s

with children
can display a Custom Element with children in the Shadow DOM and handle hiding and showing the element

Passed in 0.006s

attributes and properties
will pass boolean data as either an attribute or a property

Passed in 0.001s

attributes and properties
will pass numeric data as either an attribute or a property

Passed in 0.002s

attributes and properties
will pass string data as either an attribute or a property

Passed in 0.006s

events
can imperatively listen to a DOM event dispatched by a Custom Element

Passed in 0.009s

advanced support

attributes and properties
will pass array data as a property

Passed in 0.002s

attributes and properties
will pass object data as a property

Passed in 0.002s

attributes and properties
will pass object data to a camelCase-named property

Passed in 0.004s

events
can declaratively listen to a lowercase DOM event dispatched by a Custom Element

Passed in 0.013s

events
can declaratively listen to a kebab-case DOM event dispatched by a Custom Element

Passed in 0.002s

events
can declaratively listen to a camelCase DOM event dispatched by a Custom Element

Passed in 0.008s

events
can declaratively listen to a CAPScase DOM event dispatched by a Custom Element

Passed in 0.006s

events
can declaratively listen to a PascalCase DOM event dispatched by a Custom Element

Passed in 0.01s

System output:
FirefoxHeadless ERROR: '`ReactDOMTestUtils.act` is deprecated in favor of `React.act`. Import `act` from `react` instead of `react-dom/test-utils`. See https://react.dev/warnings/react-dom-test-utils for more info.'

React + Custom Elements

basic support

no children can display a Custom Element with no children Passed in 0.052s

with children can display a Custom Element with children in a Shadow Root Passed in 0.01s

with children can display a Custom Element with children in a Shadow Root and pass in Light DOM children Passed in 0.036s

with children can display a Custom Element with children in the Shadow DOM and handle hiding and showing the element Passed in 0.029s

attributes and properties will pass boolean data as either an attribute or a property Passed in 0.008s

attributes and properties will pass numeric data as either an attribute or a property Passed in 0.003s

attributes and properties will pass string data as either an attribute or a property Passed in 0.01s

events can imperatively listen to a DOM event dispatched by a Custom Element Passed in 0.007s

advanced support

attributes and properties will pass array data as a property Passed in 0.015s

attributes and properties will pass object data as a property Passed in 0.018s

attributes and properties will pass object data to a camelCase-named property Passed in 0.001s

events can declaratively listen to a lowercase DOM event dispatched by a Custom Element Passed in 0.019s

events can declaratively listen to a kebab-case DOM event dispatched by a Custom Element Passed in 0.015s

events can declaratively listen to a camelCase DOM event dispatched by a Custom Element Passed in 0.001s

events can declaratively listen to a CAPScase DOM event dispatched by a Custom Element Passed in 0.001s

events can declaratively listen to a PascalCase DOM event dispatched by a Custom Element Passed in 0.01s

basic support

no children can display a Custom Element with no children Passed in 0.052s

with children can display a Custom Element with children in a Shadow Root Passed in 0.005s

with children can display a Custom Element with children in a Shadow Root and pass in Light DOM children Passed in 0.021s

with children can display a Custom Element with children in the Shadow DOM and handle hiding and showing the element Passed in 0.006s

attributes and properties will pass boolean data as either an attribute or a property Passed in 0.001s

attributes and properties will pass numeric data as either an attribute or a property Passed in 0.002s

attributes and properties will pass string data as either an attribute or a property Passed in 0.006s

events can imperatively listen to a DOM event dispatched by a Custom Element Passed in 0.009s

advanced support

attributes and properties will pass array data as a property Passed in 0.002s

attributes and properties will pass object data as a property Passed in 0.002s

attributes and properties will pass object data to a camelCase-named property Passed in 0.004s

events can declaratively listen to a lowercase DOM event dispatched by a Custom Element Passed in 0.013s

events can declaratively listen to a kebab-case DOM event dispatched by a Custom Element Passed in 0.002s

events can declaratively listen to a camelCase DOM event dispatched by a Custom Element Passed in 0.008s

events can declaratively listen to a CAPScase DOM event dispatched by a Custom Element Passed in 0.006s

events can declaratively listen to a PascalCase DOM event dispatched by a Custom Element Passed in 0.01s

no children
can display a Custom Element with no children

Passed in 0.052s

with children
can display a Custom Element with children in a Shadow Root

Passed in 0.01s

with children
can display a Custom Element with children in a Shadow Root and pass in Light DOM children

Passed in 0.036s

with children
can display a Custom Element with children in the Shadow DOM and handle hiding and showing the element

Passed in 0.029s

attributes and properties
will pass boolean data as either an attribute or a property

Passed in 0.008s

attributes and properties
will pass numeric data as either an attribute or a property

Passed in 0.003s

attributes and properties
will pass string data as either an attribute or a property

Passed in 0.01s

events
can imperatively listen to a DOM event dispatched by a Custom Element

Passed in 0.007s

attributes and properties
will pass array data as a property

Passed in 0.015s

attributes and properties
will pass object data as a property

Passed in 0.018s

attributes and properties
will pass object data to a camelCase-named property

Passed in 0.001s

events
can declaratively listen to a lowercase DOM event dispatched by a Custom Element

Passed in 0.019s

events
can declaratively listen to a kebab-case DOM event dispatched by a Custom Element

Passed in 0.015s

events
can declaratively listen to a camelCase DOM event dispatched by a Custom Element

Passed in 0.001s

events
can declaratively listen to a CAPScase DOM event dispatched by a Custom Element

Passed in 0.001s

events
can declaratively listen to a PascalCase DOM event dispatched by a Custom Element

Passed in 0.01s

no children
can display a Custom Element with no children

Passed in 0.052s

with children
can display a Custom Element with children in a Shadow Root

Passed in 0.005s

with children
can display a Custom Element with children in a Shadow Root and pass in Light DOM children

Passed in 0.021s

with children
can display a Custom Element with children in the Shadow DOM and handle hiding and showing the element

Passed in 0.006s

attributes and properties
will pass boolean data as either an attribute or a property

Passed in 0.001s

attributes and properties
will pass numeric data as either an attribute or a property

Passed in 0.002s

attributes and properties
will pass string data as either an attribute or a property

Passed in 0.006s

events
can imperatively listen to a DOM event dispatched by a Custom Element

Passed in 0.009s

attributes and properties
will pass array data as a property

Passed in 0.002s

attributes and properties
will pass object data as a property

Passed in 0.002s

attributes and properties
will pass object data to a camelCase-named property

Passed in 0.004s

events
can declaratively listen to a lowercase DOM event dispatched by a Custom Element

Passed in 0.013s

events
can declaratively listen to a kebab-case DOM event dispatched by a Custom Element

Passed in 0.002s

events
can declaratively listen to a camelCase DOM event dispatched by a Custom Element

Passed in 0.008s

events
can declaratively listen to a CAPScase DOM event dispatched by a Custom Element

Passed in 0.006s

events
can declaratively listen to a PascalCase DOM event dispatched by a Custom Element

Passed in 0.01s