details-pseudo-elements-003-ref.html (209B)
1 <!DOCTYPE HTML> 2 <title>::details-content pseudo element is display: block</title> 3 <style> 4 5 #contents { opacity: 0.5; } 6 7 details 8 9 </style> 10 11 <div> 12 <div>summary</div> 13 <div id="contents">contents</div> 14 </div>