To add multiple values together using the simple text method, only use the ? at the beginning and then separate each parameter value pair with an ampersand (&).

#wm-countup?speed=3000&start=50

<center>
  <h2 style="margin:0" 
         data-wm-plugin="countup"
         data-speed="3000"
         data-start="50">100</h2>
</center>
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