document.write script execution order

The following numbers should be 1 to 5, written in ascending order:

Browsers that output numbers in such sequence:

• Safari 2.0.4, 3.0.4, 3.1.2, 3.2.1, 4.0.5, 5
• Chrome 6
• Opera 9.20, 9.27, 9.50, 9.64, 10.01, 10.10, 10.50, 10.60
• FF 1.5, 2, 3, 3.5, 3.6
• IE 5.5, 6, 7, 8

What's the order of "document.written" script execution?

<script>
... 1 ...
document.write('<script>...</script>');
... 5 ...                |
</script>                |
                         v
                      <script>
                      ... 2 ...
                      document.write('<script>...</script>');
                      ... 4 ...                |
                      </script>                |
                                               v
                                            <script>
                                            ... 3 ...
                                            </script>