1444904.html (600B)
1 <!DOCTYPE html> 2 <html> 3 <head> 4 <style> 5 #container { 6 float: left; 7 position: sticky; 8 top: 0; 9 margin-top: -20px; 10 z-index: 100; 11 } 12 13 #target { 14 margin-top: 80px; 15 width: 20px; 16 height: 20px; 17 background: green; 18 } 19 20 #necessary-fixed-box { 21 position: fixed; 22 top: 0; 23 width: 20px; 24 height: 20px; 25 26 } 27 </style> 28 </head> 29 30 <body style="height: 10000px;"> 31 <div id="container"> 32 <div id="target"></div> 33 <div id="necessary-fixed-box"></div> 34 </div> 35 </body> 36 </html>