Can you give me CSS code in which a radio button is checked by default?

additionally, could anyone give me CSS code where an component of a page is preferred by default

You do not need css computer code.All it is advisable to do is actually put checked from the input tag with the radio button.If you need to be xhtml compliant it is best to put checked=”yes” nevertheless checked is also supported.

xhtml variant:

normal html:
.