chromium/src/third_party/blink/web_tests/fast/forms/select/styling-option-checked.html - manifest_repos/chromium_src - Git at Google

 <!DOCTYPE html>
 <style>
 option {
     /* background-color and color are overridden for checked options */
     background-color: lightgreen;
     color: red;
     /* properties other than background-color and color apply to checked options */
     padding-left: 20px;
 }
 option:checked {
     /* properties other than background-color and color apply normally */
     text-decoration: underline;
 }
 </style>
 <select multiple autofocus>
     <option>foo</option>
     <option selected>bar</option>
 </select>
	<!DOCTYPE html>
	<style>
	option {
	/* background-color and color are overridden for checked options */
	background-color: lightgreen;
	color: red;
	/* properties other than background-color and color apply to checked options */
	padding-left: 20px;
	}
	option:checked {
	/* properties other than background-color and color apply normally */
	text-decoration: underline;
	}
	</style>
	<select multiple autofocus>
	<option>foo</option>
	<option selected>bar</option>
	</select>