insertAdjacentElement-beforeBegin-first-br-in-video.html (392B)
1 <!doctype html> 2 <html> 3 <head> 4 <meta charset="utf-8"> 5 <script> 6 "use strict"; 7 8 document.addEventListener("DOMContentLoaded", () => { 9 document.getElementById("font").insertAdjacentElement( 10 "beforeBegin", 11 document.getElementById("br") 12 ); 13 }); 14 </script> 15 </head><body><dt contenteditable="true"> 16 <link>p</link> 17 <video> 18 <br id="br"><br> 19 <font id="font"> 20 </font></video></dt></body></html>