Hi.
As in topic Stroke not working when width > 1 , the same happens using a TTMSFNCHTMLText (tested on a VCL Form). If Stroke.Width > 1, it shows a continuous line, ignoring the selected Stroke.Kind.
Same behaviour using a TTMSFNCImage. Maybe there are other affected FNC components.
Unfortunately in VCL (GDI), the stroke kind dash / dot can only be applied when the stroke width is 1. It's a technical limitation. Please see this example.
Not all components expose NativeCanvas as this automatically switches all drawing to GDI+. If it's important to have thick dotted/dashed borders then use protected class wrappers:
type
TTMSFNCHTMLTextOpen = class(TTMSFNCHTMLText);
TTMSFNCHTMLTextOpen(TMSFNCHTMLText1).NativeCanvas := True;