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Rich text/raw handling: add support for MathML #35005

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Description

Currently it's not possible to paste MathML into Gutenberg. Tags will get stripped.
It is possible to insert it in HTML mode, but in visual mode the tags are not protected from editing.

This PR adds a schema for MathML to the raw handler and protects the math element in rich text.

MathML rendering is supported in Safari and Firefox, but unfortunately Chrome and other browsers don't render it properly (it's just rendered as inline text). The user can add the MathJax script on the front-end, which renders it properly across all browsers. The MathJax scripts detects the math elements and transforms them. In the future we could consider adding the script to core and load it if a math element is detected on the page.

Also worth nothing that the work being done here could also enable support for ruby elements, which are quite similar for rich text to handle.

How has this been tested?

Screenshots

Types of changes

Checklist:

  • My code is tested.
  • My code follows the WordPress code style.
  • My code follows the accessibility standards.
  • I've tested my changes with keyboard and screen readers.
  • My code has proper inline documentation.
  • I've included developer documentation if appropriate.
  • I've updated all React Native files affected by any refactorings/renamings in this PR (please manually search all *.native.js files for terms that need renaming or removal).

@ellatrix ellatrix added [Feature] Rich Text Related to the Rich Text component that allows developers to render a contenteditable [Feature] Paste labels Sep 21, 2021
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Size Change: +310 B (0%)

Total Size: 1.06 MB

Filename Size Change
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build/format-library/index.min.js 5.39 kB +59 B (+1%)
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Filename Size
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@guarani guarani removed their request for review February 7, 2022 18:55
@ellatrix ellatrix mentioned this pull request Aug 18, 2023
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What do you need on Core's PHP side to support this? I thought that the last time I checked, Core would mangle MathML. Maybe not?

@@ -134,6 +134,8 @@ export default function cleanNodeList( nodeList, doc, schema, inline ) {
} else if (
node.parentNode &&
node.parentNode.nodeName === 'BODY' &&
// To do: figure out why this is needed.
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is the TODO "figure out why this cleans/prunes MathML sub-trees by default" or is it something else?

mn: { children: { '#text': {} } }, // Numeric literal.
mo: { children: { '#text': {} }, attributes: [ 'stretchy' ] }, // Operator.
ms: { children: { '#text': {} } }, // String literal.
mtext: { children: { '#text': {} } }, // Arbitrary text.
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are we missing annotation-xml here?

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