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Selector list

The CSS selector list (,) selects all the matching nodes.

/* Selects all matching elements */
span,
div {
  border: red 2px solid;
}

To reduce the size of style sheets, one can group selectors in comma-separated lists.

Syntax

element, element, element { style properties }

Examples

Single Line Grouping

Grouping selectors in a single line using a comma-separated lists.

h1, h2, h3, h4, h5, h6 { font-family: helvetica; }

Multi Line Grouping

Grouping selectors in a multiple lines using a comma-separated lists.

#main,
.content,
article {
  font-size: 1.1em;
}

Selector list invalidation

A downside to using selector lists is that the following aren't equivalent:

h1 { font-family: sans-serif }
h2:maybe-unsupported { font-family: sans-serif }
h3 { font-family: sans-serif }
h1, h2:maybe-unsupported, h3 { font-family: sans-serif }

This is because a single unsupported selector in a selector list invalidates the whole rule.

A way to remedy this us to use the :is() or :where() selectors, which accept a forgiving selector list. This will ignore invalid selectors in the list but accept those which are valid.

h1 { font-family: sans-serif }
h2:maybe-unsupported { font-family: sans-serif }
h3 { font-family: sans-serif }
:is(h1, h2:maybe-unsupported, h3) { font-family: sans-serif }

Specifications

Specification Status Comment
Selectors Level 4
The definition of 'Selector Lists' in that specification.
Working Draft Renamed to "selector list"
CSS Level 1
The definition of 'grouping' in that specification.
Recommendation Initial definition

Browser compatibilityUpdate compatibility data on GitHub

Desktop
Chrome Edge Firefox Internet Explorer Opera Safari
Selector list (,) 1 12 1 3 3.5 1
Mobile
Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
Selector list (,) ≤37 18 4 10.1 1 1.0

See also

  • The :is() and :where() pseudo-classes, which accept a forgiving selector list.

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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/CSS/Selector_list