CSS characters are not rendered as expected in user macros

Summary

When we create a user macro which applies CSS , then characters are not rendered as expected . eg: '>' is rendered as '&gt' and " (quote) is rendered as &quot
This causes issue with the functionality for the CSS script applied

Environment

Confluence 5.9.4

Steps to replicate

1. Add a user macro call it "test"
2. use the below as template

   ##@noparam
   #set($styleHtml="<style type=text/css> .wiki-content > h1 {color:red}</style>")
   $styleHtml
   

3. Create a test page and add a text as heading 1
4. add the user macro test
5. save the page

Expected result

The text should appear as red

Actual result

The text remains unchaged and when we inspect the element with browser the applied CSS has rendered the character incorrectly > as >