React-admin: <RichTextInput> not working on IE11

[phacks]

What you were expecting:

On IE11, <RichTextInput /> should work as expected.

What happened instead:

<RichTextInput /> causes a “Something went wrong” error on IE11.

Steps to reproduce:

Visit https://marmelab.com/react-admin-demo/#/products/3/description (demo app) on IE11, with the credentials demo/demo

Other information:

IE11 throws an Unspecified Error, which is not very helpful…

Environment

• React-admin version: ^2.0.0
• Last version that did not exhibit the issue (if applicable): I don’t know yet
• React version: ~16.3.1
• Browser: IE11
• Stack trace (in case of a JS error): see above

[phacks]

Did some digging on this issue, here’s what I found:

• The problem seems to reside in the packages/ra-input-rich-text/src/styles.js file, specifically on the two content: '', lines;
• Commenting them makes the component work again on IE11;
• The underlying problem _seems_ to be in the css-vendor library, specifically in the cssVendor.supportedValue method that breaks on IE11 with content and '' as parameters. Currently trying to make sure that this is the root cause. Edit: confirmed!
• css-vendor is a dependency of @material-ui/core

[phacks]

OK, seems that the content: '' attribute is currently not working on Chrome either:

I’d suggest the following approach:

1. I create a PR removing those two faulty (and unnecessary) lines in react-admin, which would fix the problem as far as React Admin is concerned;
2. I’ll try and see upstream (MUI, css-vendor) if I can suggest a fix that would 1) take into account the content: '' property and 2) not throw a breaking error on IE11 in that instance.

@Kmaschta what do you think?

[phacks]

I created PR #2676, feel free to have a look at it/merge it 😊