CSS3/Selectors/id selector
ID Selector
The ID selector represents an element with the id attribute whose value is a whitespace-separated list of words, one of which is exactly "idname".
Syntax
#idname{ properties }
Point, Note
- What makes attributes of type ID special is that no two such attributes can have the same value in a document.
Example
[style.css]
#pastoral{ color: green; }
[index.html]
<body> <h1>Not green</h1> <h1 id="pastoral">green</h1> </body>
The CSS Selectors Level 3 specification defines the ID selector in 6.5. ID selectors.