<!DOCTYPE html> <html class="reftest-wait"> <head> <body style="white-space:pre"> FG JK <script> document.body.offsetTop; var t = document.body.firstChild; var sel = window.getSelection(); sel.collapse(t, 1); sel.extend(t, 3); function doTest() { t.insertData(0, ' BC \n'); document.documentElement.removeAttribute('class'); } document.addEventListener("MozReftestInvalidate", doTest); </script> </body> </html>