This example sets the top edge of the paragraph 20 px below the top edge of the window:
这个举例可让段落放置在窗口的最上边，并向下20px:
p
{
position: absolute;
top: 20px
}

This example sets the top edge of the paragraph 20 px above the top edge of the window:
这个举例可让段落放置在窗口的最上边，并向上20px:
p
{
position: absolute;
top: -20px
}