OptionalcolorOptionaldelayMilliseconds before the mask appears (default 0); aria-busy is set at once
OptionalfontText size in CSS px (default 12)
OptionalmaskMask over the chart (default: the theme surface at 80% opacity)
OptionalspinnerSpinner (default true)
OptionaltextStatus text (default: 'Loading…' in the chart language)
OptionaltextText color (default: theme primary text)
Spinner color (default: the first palette color)