:default CSS pseudo-class
The :default pseudo-class matches checkboxes and radio buttons which are checked by default,

CSS
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BROWSER SUPPORT FOR :default CSS pseudo-class
Google Chrome
:default CSS pseudo-class element is not supported by Chrome version 4 to 14. However Chrome 15 to 50 partially supports :default CSS pseudo-class and it doesn't match or
. Chrome 51 to 66 supports :default CSS pseudo-class element completely.
Mozilla Firefox
This element is not supported by Mozilla Firefox browser version 2 to 3.6. Later browser version from to 60 supports :default CSS pseudo-class property.
Internet Explorer
:default CSS pseudo-class property is not supported by any versions of Internet explorer.
Safari
Safari version 3.1 to 5 doesn't support CSS color-adjust. However later versions from 5.1 to 10 partially supports :default CSS pseudo-class and version 10.1 to 11 supports it completely.
Microsoft Edge
No Microsoft Edge browser version supports :default CSS pseudo-class.
Opera
Early Opera browser versions from 10.1 to 11.5 doesn't support :default CSS pseudo-class element at all. Opera version 12.1 onwards till version 37 partially supported :default CSS pseudo-class and later version fully supports it.
Information sourced from
"Can I use" provides up-to-date browser support tables for support of front-end web technologies on desktop and mobile web browsers.
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