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Currently, only Firefox can render MathML equations embedded in the HTML code. MathJax is a solution to properly view MathML equations embedded in HTML content in a variety of browsers.

If you have DocBook content that has embedded MathML equations and you want to properly view the equations in published HTML output types (such as WebHelp), you need to add a reference to the MathJax script in the head element of all HTML files that have the equation embedded.

For example:
<script type="text/javascript"
  src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.1/MathJax.js?config=TeX-AMS-MML_HTMLorMML">
</script>

Result: The equation should now be properly rendered in the WebHelp output for other browsers.