Text Shadow - more then a shadow
The structure of text shadow is:
text-shadow: horizontal offset vertical offset blur color,
horizontal offset vertical offset blur color,
.... ....
horizontal offset vertical offset blur color;
If you want to read more, go to the official specification at W3: http://www.w3.org/TR/css-text-decor-3/#text-shadow-property.
A very good description you can find on https://developer.mozilla.org/en-US/docs/CSS/text-shadow.
Which browsers do support this, see Can I use CSS3 Text-shadow? on www.caniuse.com. Test with javascript for support:
document.getElementsByTagName("body")[0].style.textShadow !== undefined
This javascript test is true, if text shadow is supported.
You can see the instruction video at youtube by clicking on this text here. To see how it works: Play around!
?
Your browser doesn't support text-shadow. If you want to use text-shadow, you may want to look at http://caniuse.com/css-textshadow for which browsers do support it.