The <string> CSS data type represents a sequence of characters. Strings are used in numerous CSS properties, including content, font-family, and quotes.
Syntax
A string is composed of one or more Unicode characters surrounded by either double (") or single (') quotes.
Most characters can be represented literally. When escaped with a backslash, they can also be represented with their respective Unicode code points in hexadecimal. For example, \27 represents the single quote ('), and \A9 represents the copyright symbol (©).
Importantly, certain characters which would otherwise be invalid can be escaped with a backslash (\). These include double quotes when used inside a double-quoted string, single quotes when used inside a single-quoted string, and the backslash itself.
New lines are invalid unless escaped with a line feed character such as \A or \00000A. In your code, however, strings can span multiple lines, in which case each new line must be escaped with a "\" as the last character of the line.
Examples
/* Simple quote escaping */ "Awesome string with double quotes" "Awesome string with \" escaped double quotes" 'Awesome string with single quotes' "Awesome string with \' escaped single quotes" /* New line in a string */ "Awesome string with \Aline break" /* String spanning over two lines (these two strings are exactly the same) */ "A really long \ awesome string" "A really long awesome string"
\22 and single-quoted strings can be escaped using \27.Specifications
| Specification | Status | Comment | 
|---|---|---|
| CSS Values and Units Module Level 3 The definition of '<string>' in that specification.  | 
   Candidate Recommendation | No significant change from CSS Level 2 (Revision 1). | 
| CSS Level 2 (Revision 1) The definition of '<string>' in that specification.  | 
   Recommendation | Explicit definition; allows 6-digit Unicode escaped characters. | 
| CSS Level 1 The definition of '<string>' in that specification.  | 
   Recommendation | Implicit definition; allows 4-digit Unicode escaped characters. | 
Browser Compatibility
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari | 
|---|---|---|---|---|---|
| Basic support | 1.0 | 1.0 (1.0) | (Yes) | (Yes) | 1.0 (85) | 
| \xx | 1.0 | 1.0 (1.0) | 6.0 | (Yes) | 1.0 (85) | 
| Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile | 
|---|---|---|---|---|---|---|
| Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | 
| \xx | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |