July 2024. Updated February 2025.
MathML Test Page now with MathJax / LaTeX
I first got curious to experiment with MathML during an HWC Europe meeting.
This test is based on The Problem, an interview question we used at a former employer.
This is an image:

This is MathML:
find i, j such that Ax is maximized.
Source Code of the MathML
<article class="sample"> Given a sequence of integers <math> <mrow> <msub> <mi>A</mi> <mn>0</mn> </msub> <mo>...</mo> <msub> <mi>A</mi> <mi>n</mi> </msub> </mrow> </math> <br/> find i, j such that <math xmlns="http://www.w3.org/1998/Math/MathML"> <mstyle displaystyle="true"> <munderover> <mo>∑</mo> <mrow> <mi>x</mi> <mo>=</mo> <mi>i</mi> </mrow> <mi>j</mi> </munderover> </mstyle> </math> A<sub><i>x</i></sub> is maximized. </article>
Using MathJax
Thanks to the participants of Front End Study Hall #022 for helping clarify the uses of MathML, LaTeX
find i, j such that $$ \sum^{j}_{x=1} A_{x} $$ is maximized.
MathJax Source Code
<article class="sample">
Given a sequence of integers
<span style="display: inline-block;">$$ A_{0} \dots A_{n} $$</span>
<br/>
find i, j such that <span style="display: inline-block;">$$ \sum^{j}_{x=1} A_{x} $$</span>
is maximized.
</article>
<script type="text/javascript" id="MathJax-script" async src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-svg.js">
MathJax.Hub.Config({
tex2jax: {
displayMath: [['$$', '$$'], ['\\[', '\\]']],
processEscapes: true
}
});
</script>