3.2.3.1 The id attribute
The id attribute specifies its element’s unique identifier (ID).
[DOMCORE]
The value must be unique amongst all the IDs in the element’s home
subtree and must contain at least one character. The value must not
contain any space characters.
An element’s unique identifier can be used for a variety of purposes,
most notably as a way to link to specific parts of a document using
fragment identifiers,as a way to target an element when scripting,
and as a way to style a specific element from CSS.
Identifiers are opaque strings. Particular meanings should not be
derived from the value of the id attribute.
最后
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