USVString
A USVString
is a sequence of Unicode scalar values. This definition differs from that of DOMString
or the JavaScript String
type in that it always represents a valid sequence suitable for text processing, while the latter can contain surrogate code points. The USVString
type is generally found in APIs that perform text processing, while DOMString
is used by most other APIs.
When a USVString
is provided to JavaScript, it maps to the JavaScript primitive String
with the UTF-16 encoding of its sequence of Unicode scalar values.
When a Web API accepts a USVString
, the JavaScript value provided is first stringified, in the same way as for DOMString
. The resulting string is then further converted to USVString
by replacing any surrogate code points (or equivalently, any unpaired surrogate code units) with the Unicode "replacement character" U+FFFD (�).
Specifications
Specification | Status | Comment |
---|---|---|
Web IDL The definition of 'USVString' in that specification. |
Candidate Recommendation | Initial definition of the USVString type itself. |
Web IDL | Candidate Recommendation |
This defines how JavaScript values are converted to
USVString and vice versa.
|