The CSS ID selector matches an element based on the value of its 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 this is equivalent to the following attribute selector:

[id=id_value] { style properties }

Example

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

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

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidiOS SafariSamsung Internet
Basic supportChrome Full support 1Edge Full support 12Firefox Full support 1IE Full support YesOpera Full support YesSafari Full support YesWebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support 4Opera Android Full support YesSafari iOS Full support YesSamsung Internet Android Full support Yes

Legend

Full support  
Full support

Document Tags and Contributors

Last updated by: FumiyaShibusawa,