Web/CSS/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>

Specifications

Specification	Status	Comment
Selectors Level 4The definition of 'ID selectors' in that specification.	Working Draft
Selectors Level 3The definition of 'ID selectors' in that specification.	Recommendation
CSS Level 2 (Revision 1)The definition of 'ID selectors' in that specification.	Recommendation
CSS Level 1The definition of 'ID selectors' in that specification.	Recommendation	Initial definition

Browser compatibility

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
ID selector (#idName)	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 3	Opera Full support 3.5	Safari Full support 1	WebView Android Full support ≤37	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0

Legend

Full support  

Full support

ID selectors by Mozilla Contributors is licensed under CC-BY-SA 2.5.