<!DOCTYPE html> <html class="reftest-wait"> <style> html, body { margin: 0; } thead tr { position: relative; top: 50px; } th { background-color: green; height: 20px; } td { background-color: blue; } </style> <body> <table cellspacing=0> <thead> <tr><th></th></tr> </thead> <tbody> <tr><td style="height: 2000px; vertical-align: top">table cell</td></tr> </tbody> </table> <script> addEventListener('load', function() { document.scrollingElement.scrollTop = 50; document.documentElement.classList.remove('reftest-wait'); }, false); </script> </html>