| <!DOCTYPE html> | |
| <style> | |
| .a + span::before { content: "PA" } | |
| .b + ::before { content: "SS" } | |
| </style> | |
| <p>You should see the word PASS below.</p> | |
| <span id="t1"></span><span></span><span id="t2"></span><span></span> | |
| <script> | |
| document.body.offsetTop; | |
| t1.className = "a"; | |
| t2.className = "b"; | |
| </script> |