Unknown node type "mstack"

[lled0]

Issue Summary

Hi,

I'm trying to parse a mml formula, but show error: Unknown node type "mstack".

I read in documentation that MathML3 is implemented in version 3 and there isn't needed to import the extension.

Steps to Reproduce:

Here is an example.

Must be shown:

Technical details:

• MathJax Version: 3

Thank you!

[dpvc]

I read in documentation that MathML3 is implemented in version 3 and there isn't needed to import the extension.

You have misread the documentation. In the link you provide there is a pointer to configuring the extension, and that page indicates that you must use

<script>
MathJax = {
  loader: {load: ['[mml]/mml3']}
};
</script>

to activate the extension. There are, however, several issues with the mml3 extension (see #2718). The first, is that you need to also include forceReparse: true in the configuration, as in

<script>
MathJax = {
  loader: {load: ['[mml]/mml3']},
  mml: {forceReparse: true}
};
</script>

and second, there is an issue with Chrome and Safari that you need to work around. This configuration should do it for the MathJax component that you are using:

  <script>
  MathJax = {
    loader: {load: ['[mml]/mml3']},
    mml: {forceReparse: true},
    startup: {
      ready() {
        MathJax.startup.defaultReady();
        MathJax.startup.document.inputJax[1].preFilters.add(function (data) {
          data.data = data.data.replace(/[\s\n]+<math/, '<math').replace(/math>[\n\s]+/, 'math>');
        }, 10);
      }
    }
  };
  </script>

The Chrome/Safari issue should be resolved and the documentation updated in the next release.

[svejdani]

@dpvc The above filter wasn't working and I believe it was due to inputJax[1]. It should be inputJax[0].

[dpvc]

@svejdani, it depends on the MathJax file that you are loading. If you used tex-mml-chtml.js, then it would be inputJax[1], but if you used mml-chtml.js then it would be inputJax[0]. Sorry for the confusion!

[svejdani]

Awesome thanks, that makes more sense!

[chrisooo3]

@dpvc after adding configuration, that you have mentioned, I am getting following error:

TypeError: Cannot read property 'getElementsByTagName' of null
    at e.tags (mml-svg.js:1)
    at e.transform (mml3.js:1)
    at e.mmlFilter (mml3.js:1)
    at e.execute (mml-svg.js:1)
    at e.t.executeFilters (mml-svg.js:1)
    at e.compile (mml-svg.js:1)
    at e.t.compile (mml-svg.js:1)
    at Object.renderMath (mml-svg.js:1)
    at e.renderConvert (mml-svg.js:1)
    at e.t.convert (mml-svg.js:1)

To reproduce, here you have jsbin: https://jsbin.com/kuwujesure/1/edit?html,console,output

[dpvc]

@chrisooo3, only he loader section of the configuration is needed in v3.2.2 of MathJax, and in any case, your jsbin example has the problem that it uses inputJax[1] rather than inputJax[0] (see my previous comment).

I will respond in your new issue #3030 rather than in this older issue.