:-moz-only-whitespace

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Non-standard
This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

Note: In Selectors Level 4 the :empty selector was changed to act like :-moz-only-whitespace, but no browser currently supports this yet.

The :-moz-only-whitespace CSS pseudo-class matches elements that only contains text nodes that only contain whitespace. (This includes elements with empty text nodes and elements with no child nodes.)

Syntax

Syntax not found in DB!

Example

HTML

<div> </div>

CSS

div {
  border: 4px solid red;
}

:-moz-only-whitespace {
  border-color: lime;
}

Result

Specifications

Briefly defined as :blank in Selectors Level 4, but then the functionality was merged into :empty and :blank redefined to mean empty <input>.

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
:-moz-only-whitespace
Non-standard
Chrome No support NoEdge No support NoFirefox Full support 1
Notes
Full support 1
Notes
Notes See bug 1106296.
IE No support NoOpera No support NoSafari No support NoWebView Android No support NoChrome Android No support NoFirefox Android Full support 4
Notes
Full support 4
Notes
Notes See bug 1106296.
Opera Android No support NoSafari iOS No support NoSamsung Internet Android No support No

Legend

Full support  
Full support
No support  
No support
Non-standard. Expect poor cross-browser support.
Non-standard. Expect poor cross-browser support.
See implementation notes.
See implementation notes.

See also