text-shadow applies one or more shadow effects to the text of an element. Each shadow takes a horizontal offset, a vertical offset, an optional blur radius, and a color, for example text-shadow: 4px 4px 4px rgba(0,0,0,0.6).
Separate each shadow with a comma in a single text-shadow declaration, such as text-shadow: 1px 1px 2px red, 0 0 8px blue. The shadows are painted front to back, so the first one listed sits on top.
Yes. text-shadow is supported in all modern browsers including Chrome, Firefox, Safari, and Edge, and no vendor prefix is needed. Only very old versions of Internet Explorer (IE 9 and earlier) lack support.
Set both the horizontal and vertical offsets to 0 and use a larger blur radius, for example text-shadow: 0 0 10px #0ff. Because the shadow spreads evenly around the text with no offset, it reads as a glow rather than a directional shadow.