Internet Explorer 11: standalone demo app doesn't work

[afercia]

Explanation

The standalone demo app http://localhost:3333/ doesn't work with Internet Explorer 11 because of some obscure (IE11 doesn't help) JS errors.

Especially relevant when there's the need to test components in IE 11.

Screenshots:

Obscure error:

Clicking the error line leads to a long base64 encoded string:

Which seems related to the parse5 package formatting-element-list:

Debugging on IE 11 is terrible and didn't spend more time on this. Just tried with an exclusion process and removing these components from the app demo makes IE11 happy:

• KeywordExample
• SnippetEditor
• LinkSuggestionsWrapper

Wild guess: some npm package used in all these three components has issues with IE11.

I do realize this isn't a priority, however at the moment testing the component on IE11 is not possible.

Technical decisions

Feedback?

[afercia]

Probably parse5 needs to be transpiled? See inikulin/parse5#252

/Cc @atimmer 👋

[afercia]

Still an issue and, for example, I can't test #376 with IE11.

Not sure who's the best person to ping 🙂