Add html to an existing web page

Hi,

I have an existing set of web pages and want to add or insert Powershell output from scripts directly into them.  The script outputs are converted to HTML already.  Manually adding the script output's HTML code into the existing HTML web page presents it well.  My question would be what is the best way to script this process? 

I don't have any code here to present but the one item I can reference for you is that I would want to inject the script HTML outputs between <div> element properties of the existing web site pages. 

For example, add in script output between:

<div id="uptime"> & </div>

Please let me extend my appreciation in advance for taking the time to review my question.