dillon1000/react

Add custom element property support behind a flag (#22184)

* custom element props

* custom element events

* use function type for on*

* tests, htmlFor

* className

* fix ReactDOMComponent-test

* started on adding feature flag

* added feature flag to all feature flag files

* everything passes

* tried to fix getPropertyInfo

* used @gate and __experimental__

* remove flag gating for test which already passes

* fix onClick test

* add __EXPERIMENTAL__ to www flags, rename eventProxy

* Add innerText and textContent to reservedProps

* Emit warning when assigning to read only properties in client

* Revert "Emit warning when assigning to read only properties in client"

This reverts commit 1a093e584ce50e2e634aa743e04f9cb8fc2b3f7d.

* Emit warning when assigning to read only properties during hydration

* yarn prettier-all

* Gate hydration warning test on flag

* Fix gating in hydration warning test

* Fix assignment to boolean properties

* Replace _listeners with random suffix matching

* Improve gating for hydration warning test

* Add outerText and outerHTML to server warning properties

* remove nameLower logic

* fix capture event listener test

* Add coverage for changing custom event listeners

* yarn prettier-all

* yarn lint --fix

* replace getCustomElementEventHandlersFromNode with getFiberCurrentPropsFromNode

* Remove previous value when adding event listener

* flow, lint, prettier

* Add dispatchEvent to make sure nothing crashes

* Add state change to reserved attribute tests

* Add missing feature flag test gate

* Reimplement SSR changes in ReactDOMServerFormatConfig

* Test hydration for objects and functions

* add missing test gate

* remove extraneous comment

* Add attribute->property test