The color scheme named "default" on https://x3270.miraheze.org/wiki/ColorScheme_resource does not match the x3270 color scheme in the source. It should be renamed "sample" or another name, and a sample "x3270.colorScheme" resource added above it in the example to show to point at it.
(Inserting the actual default would be problematic as soon as the source is edited.)
The color scheme named "default" on https://x3270.miraheze.org/wiki/ColorScheme_resource does not match the x3270 color scheme in the source. It should be renamed "sample" or another name, and a sample "x3270.colorScheme" resource added above it in the example to show to point at it.
(Inserting the actual default would be problematic as soon as the source is edited.)