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; }
#id_value { style properties }
Note that this is equivalent to the following attribute selector
:
[id=id_value] { style properties }
#identified { background-color: skyblue; }
<div id="identified">This div has a special ID on it!</div> <div>This is just a regular div.</div>
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 |
Desktop | ||||||
---|---|---|---|---|---|---|
Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | |
Basic support | 1 | 12 | 1 | Yes | Yes | Yes |
Mobile | |||||||
---|---|---|---|---|---|---|---|
Android webview | Chrome for Android | Edge Mobile | Firefox for Android | Opera for Android | iOS Safari | Samsung Internet | |
Basic support | Yes | Yes | Yes | 4 | Yes | Yes | Yes |
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https://developer.mozilla.org/en-US/docs/Web/CSS/ID_selectors