Line Height - Set a custom line height (e.g. 100px) by adding &lineheight=100px to the end of the url.
Font Weight - Set a custom font weight (e.g. 100) by adding &fontweight=100 to the end of the url. More info.
Date Objects - You can insert dynamic dates which always show the current date by adding DATE( ) inside the text field. The following codes inside the ( ) will be replaced:
dd - the day of the month
mm - the current month (numeric)
yyyy - the current year
day - the day of the week
month - the current month (name)
You can also change the date to display (add or subtract days) to show, for example, include a  for tomorrow's date or [-1] for yesterday's.
The reference date is always equal to the local date of the person viewing the page.