This was introduced in React 16.5.0. If IE9 encounters an unknown html element in development, React crashes as it attempts to call console.error.apply here: https://github.com/facebook/react/blob/b87aabdfe1b7461e7331abb3601d9e6bb27544bc/packages/shared/warningWithoutStack.js#L30 This is reproduceable with the following CodePen: **Code** https://codepen.io/nhunzaker/pen/YOeZXv **Demo** https://s.codepen.io/nhunzaker/debug/YOeZXv/mWMoNxzPjbZk
This was introduced in React 16.5.0.
If IE9 encounters an unknown html element in development, React crashes as it attempts to call console.error.apply here:
https://github.com/facebook/react/blob/b87aabdfe1b7461e7331abb3601d9e6bb27544bc/packages/shared/warningWithoutStack.js#L30
This is reproduceable with the following CodePen:
Code
https://codepen.io/nhunzaker/pen/YOeZXv
Demo
https://s.codepen.io/nhunzaker/debug/YOeZXv/mWMoNxzPjbZk