Return Default Required Fields Highlight Color from Preferences using Javascript

How do you set a text fields strokeColor to the default setting that is in each users individual preference "Required Fields Highlight Color"

I need to keep the field set as not required.

this.getField("myField_Required").required = true;
this.getField("myField_Not_Required").required = false;
this.getField("myField_Not_Required").strokeColor = syntax for required fields highlight color setting in each individual users preference setting

thanks