<div style="position:absolute; top:0; left:0; width:100vw; height:100vh; background:red; z-index:999999;"> <div id="spam"></div> <script> for(let i=0; i<10000; i++) { document.getElementById('spam').innerHTML += '<div>SPAM</div>'; } </script> </div>

<b>This should be bold if HTML is allowed</b>