-webkit-text-stroke

/* Width and color values */
-webkit-text-stroke: 4px navy; 
text-stroke: 4px navy;

/* Global values */
-webkit-text-stroke: inherit;
-webkit-text-stroke: initial;
-webkit-text-stroke: unset;
text-stroke: inherit; 
text-stroke: initial; 
text-stroke: unset;

Applies to all elements   [Inherited](inheritance) yes   Media visual   [Computed value](computed_value) as each of the properties of the shorthand:

Animation type as each of the properties of the shorthand:

Canonical order Canonical order  

<length> || <color>where 
<color> = <rgb()> | <rgba()> | <hsl()> | <hsla()> | <hex-color> | <named-color> | currentcolor | <deprecated-system-color>
where 
<rgb()> = rgb( [ [ <percentage>{3} | <number>{3} ] [ / <alpha-value> ]? ] | [ [ <percentage>#{3} | <number>#{3} ] , <alpha-value>? ] )
<rgba()> = rgba( [ [ <percentage>{3} | <number>{3} ] [ / <alpha-value> ]? ] | [ [ <percentage>#{3} | <number>#{3} ] , <alpha-value>? ] )
<hsl()> = hsl( [ <hue> <percentage> <percentage> [ / <alpha-value> ]? ] | [ <hue>, <percentage>, <percentage>, <alpha-value>? ] )
<hsla()> = hsla( [ <hue> <percentage> <percentage> [ / <alpha-value> ]? ] | [ <hue>, <percentage>, <percentage>, <alpha-value>? ] )
where 
<alpha-value> = <number> | <percentage>
<hue> = <number> | <angle>

<p id="example">The stroke of this text is red.</p>

#example {
  font-size: 3em;
  margin: 0;
  -webkit-text-stroke: 2px red;
}