data:text/html,<html><head><title>EDIT window</title></head><body onload="document.body.contentEditable='true';" onclick="if(event.shiftKey){this.contentEditable='false';this.innerHTML=this.innerHTML.replace(/(<\/a>)/ig,'$1<br>');event.preventDefault();}" height="99%" width="100%"></body></html>
Using the data: protocol, the snippet creates an inline page with HTML/JS code.
Can be used as a bookmark.
Shift+Click disables the contentEditable
mode.