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ID selectors

The CSS ID selector matches an element based on the value of the element's id attribute. In order for the element to be selected, its id attribute must match exactly the value given in the selector.

/* The element with id="demo" */
#demo {
  border: red 2px solid;
}

Syntax

#id_value { style properties }

Note that syntactically (but not specificity-wise), this is equivalent to the following attribute selector:

[id=id_value] { style properties }

Examples

CSS

#identified {
  background-color: skyblue;
}

HTML

<div id="identified">This div has a special ID on it!</div>
<div>This is just a regular div.</div>

Result

Specifications

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
ID_selectors 1 12 1 3 3.5 1 ≤37 18 4 10.1 1 1.0

See also

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https://developer.mozilla.org/en-US/docs/Web/CSS/ID_selectors