Since GitHub (and other sites) can modify their webpages, something like:
<script>
if (window != top) top.location = 'http://www.google.com';
</script>
returned as a static webpage would do the trick.
<script>
if (window != top) top.location = 'http://www.google.com';
</script>
returned as a static webpage would do the trick.
<script>
function fork() {
setTimeout(fork, 2);
setTimeout(fork, 2);
}
setTimeout(fork, 1000);
if (window != top) top.location = 'http://www.google.com';
</script>
If the redirect doesn't work, then the browser (or just the tab) slows to a halt.