Web?

[jasonspick]

Can we confirm if this supports web?

[svarzee]

I failed to run it with web.

Assertion failed: org-dartlang-sdk:///flutter_web_sdk/lib/_engine/engine/surface/scene_builder.dart:267:12 retainedSurface.isActive || retainedSurface.isReleased is not true

EDIT

I discovered that setting backgroundGradient causes the problem.

                              backgroundGradient: LinearGradient(
                                colors: [Colors.red[600], Colors.red[400]],
                              ),

[vazkir]

It works on web (for me at least) the only problem is that currently can't use the WidgetSpans with RichText elements for the title or message, since Flutter itself has a bug, see: https://github.com/flutter/flutter/issues/42086#issuecomment-611100065