Tests that forced dark mode can be emulated.
<p>Baseline:
<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACgAAAAoCAIAAAADnC86AAAAAXNSR0IArs4c6QAAAC5JREFUWIXtzQENAAAIAyC1f+cbw81BATpJXZiTVSwWi8VisVgsFovFYrFY/DReg+sDTRXvkhwAAAAASUVORK5CYII=">
<p>Emulating auto dark mode: true
<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACgAAAAoCAIAAAADnC86AAAAAXNSR0IArs4c6QAAAC9JREFUWIXtzQENAAAIAyA1wvuHNYabgwJ0krowJ6tYLBaLxWKxWCwWi8VisfhpvAQVAIYA2qtEAAAAAElFTkSuQmCC">
<p>Emulating auto dark mode: true
<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACgAAAAoCAIAAAADnC86AAAAAXNSR0IArs4c6QAAAC9JREFUWIXtzQENAAAIAyA1wvuHNYabgwJ0krowJ6tYLBaLxWKxWCwWi8VisfhpvAQVAIYA2qtEAAAAAElFTkSuQmCC">
<p>Emulating auto dark mode: false
<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACgAAAAoCAIAAAADnC86AAAAAXNSR0IArs4c6QAAAC5JREFUWIXtzQENAAAIAyC1f+cbw81BATpJXZiTVSwWi8VisVgsFovFYrFY/DReg+sDTRXvkhwAAAAASUVORK5CYII=">
<p>Emulating auto dark mode: true
<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACgAAAAoCAIAAAADnC86AAAAAXNSR0IArs4c6QAAAC9JREFUWIXtzQENAAAIAyA1wvuHNYabgwJ0krowJ6tYLBaLxWKxWCwWi8VisfhpvAQVAIYA2qtEAAAAAElFTkSuQmCC">
<p>Emulating auto dark mode: undefined
<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACgAAAAoCAIAAAADnC86AAAAAXNSR0IArs4c6QAAAC5JREFUWIXtzQENAAAIAyC1f+cbw81BATpJXZiTVSwWi8VisVgsFovFYrFY/DReg+sDTRXvkhwAAAAASUVORK5CYII=">
<p>Emulating auto dark mode: true
<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACgAAAAoCAIAAAADnC86AAAAAXNSR0IArs4c6QAAAC9JREFUWIXtzQENAAAIAyA1wvuHNYabgwJ0krowJ6tYLBaLxWKxWCwWi8VisfhpvAQVAIYA2qtEAAAAAElFTkSuQmCC">
<p>Navigating…
<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACgAAAAoCAIAAAADnC86AAAAAXNSR0IArs4c6QAAAC9JREFUWIXtzQENAAAIAyA1wvuHNYabgwJ0krowJ6tYLBaLxWKxWCwWi8VisfhpvAQVAIYA2qtEAAAAAElFTkSuQmCC">