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> But, I noticed in Wikipedia that they are using MathJax as SVG.

Are you sure? As far as I can tell, Wikipedia doesn't use MathJax at all. They appear to have some backend renderer.

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> Whenever I copy text of that SVG I can copy "MathJax" (Maybe, Latex. The formatting little bit looks like Latex).  
> ...  
> They had put Latex code in alt text.

Inspecting with debugger tools, what I see is:

    <span class="mwe-math-element">
      <span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;">
        <math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle SNIP TEX MARKUP,}">
          ...
        </math>
      </span>
      <img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/IDENTIFIER" class="mwe-math-fallback-image-inline" aria-hidden="true" style="vertical-align: -5.338ex; width:79.624ex; height:9.176ex;" alt="{\displaystyle SNIP TEX MARKUP,}">
    </span>

So it's using MathML and server-side rendering with a fallback mechanism which includes the original TeX markup as two separate alt texts, explaining why when you select and copy it duplicates it.

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> So, could you try code for SVG once? (If you are free)

You can switch the renderer yourself: right-click a MathJax rendered span, and in the menu select `Math Settings > Math Renderer > SVG`.

You can also copy the original markup with the same menu, with `Copy to Clipboard > TeX Commands`.