[Webkit-unassigned] [Bug 280682] New: Support standalone MathML files in MML format

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=280682

            Bug ID: 280682
           Summary: Support standalone MathML files in MML format
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: MathML
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: hi at pepelsbey.dev

Created attachment 472751

  --> https://bugs.webkit.org/attachment.cgi?id=472751&action=review

Standalone MathML file

There’s a .mml file extension [mentioned in the MathML 4.0 spec](https://w3c.github.io/mathml/#encoding-names) for standalone MathML files, just like .svg for SVG. And just like SVG, it’s an XML-based format that requires the `xmlns` attribute with a certain value to work and doesn’t need the `xmlns` when inlined in HTML.

```xml
<math xmlns="http://www.w3.org/1998/Math/MathML">
  <mrow>
    <msup>
      <mi>x</mi>
      <mn>2</mn>
    </msup>
    <mo>+</mo>
    <mi>y</mi>
  </mrow>
</math>
```

```xml
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20">
 <rect width="20" height="20" fill="green" />
</svg>
```

Today, all browsers support rendering MathML inlined into HTML, but currently, only Firefox supports rendering MML files.

```html
<p>
  <math>
    <mrow>
      <msup>
        <mi>x</mi>
        <mn>2</mn>
      </msup>
      <mo>+</mo>
      <mi>y</mi>
    </mrow>
  </math>
</p>
```

```html
<p>
  <svg width="20" height="20" viewBox="0 0 20 20">
    <rect width="20" height="20" fill="green" />
  </svg>
</p>
```


The MML rendering in Firefox looks very similar to SVG: it takes the whole page, there’s XML in the view source and DOM in the DevTools, and it shows parsing error when the MML file is not well-formed. MML files also work when loaded in an iframe, but doesn’t work in `<img>`.

Both Safari and Chrome show MML as plain text. See the attached MML file example.

It’s not common to share MathML as standalone files. Still, it might be convenient/useful to store formulas in external files to reuse them in multiple content locations (inlined during build time, for example), just like SVG.

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