This ID selector is selecting (none or) one element that has a given id attribute; because the element with the ID has to be unique.
# Syntax
Copy
#id {
/* declarations */
}
# Example
Copy
#header {
border: 1px solid black;
}
This example will add a black border around the <div> with the #header ID.
# Browser support
Platform
Chrome
Firefox
Safari
Edge
Internet Explorer
Opera
Desktop
Yes (1.0)
Yes (1.0)
Yes (1.0)
Yes (12.0)
Yes (3.0)
Yes (2.0)
Mobile
Yes (1.0)
Yes (1.0)
Yes (1.0)
Yes (12.0)
Yes (3.0)
Yes (2.0)
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