:id
Targets a single, unique element on a page that has a matching 'id' attribute. Since IDs must be unique, this selector should only ever match one element.
Syntax
/* Usage Example */
#main-header {
/* Styles the unique element with id='main-header' */
background-color: #f3f4f6;
padding: 2rem;
}:id Browser support
Widely available
Since
2015 96% global usage
This feature is well established and works across many devices and browser versions. It has been available across browsers since 2015.
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