Update math formula sanitizer config

Author: OEvgeny

__tests__/html2/markdown/math/layout.1.html.snap-1.png

@@ -91,8 +91,7 @@
 
 15. LLM generation error:
 \[
-\
-\]
+\\]
     </x-message>
   </template>
   <main id="webchat"></main>

__tests__/html2/markdown/math/layout.2.html.snap-1.png

@@ -51,35 +51,112 @@ const DEFAULT_ALLOWED_TAGS: ReadonlyMap<string, Readonly<{ attributes: ReadonlyS
         ['ul', []],
 
         // Followings are for MathML elements, from https://developer.mozilla.org/en-US/docs/Web/MathML.
-        ['annotation-xml', []],
-        ['annotation', []],
-        ['math', []],
-        ['merror', []],
-        ['mfrac', []],
-        ['mi', []],
-        ['mmultiscripts', []],
-        ['mn', []],
-        ['mo', []],
-        ['mover', []],
-        ['mpadded', []],
-        ['mphantom', []],
+        ['annotation-xml', ['encoding', 'src', 'name', 'definitionURL']],
+        ['annotation', ['encoding', 'src', 'name', 'definitionURL']],
+        ['math', ['display', 'xmlns', 'mode', 'overflow', 'alttext', 'mathbackground', 'mathcolor']],
+        ['merror', ['mathbackground', 'mathcolor']],
+        ['mfenced', ['close', 'open', 'separators']],
+        ['mfrac', ['linethickness', 'numalign', 'denomalign', 'bevelled']],
+        ['mi', ['mathvariant', 'mathsize', 'mathbackground', 'mathcolor']],
+        ['mmultiscripts', ['subscriptshift', 'superscriptshift']],
+        ['mn', ['mathvariant', 'mathsize', 'mathbackground', 'mathcolor']],
+        [
+          'mo',
+          [
+            'form',
+            'fence',
+            'separator',
+            'lspace',
+            'rspace',
+            'stretchy',
+            'symmetric',
+            'maxsize',
+            'minsize',
+            'largeop',
+            'movablelimits',
+            'accent',
+            'linebreak',
+            'mathvariant',
+            'mathsize',
+            'mathbackground',
+            'mathcolor'
+          ]
+        ],
+        ['mover', ['accent', 'align']],
+        ['mpadded', ['height', 'width', 'depth', 'lspace', 'voffset']],
+        ['mphantom', ['mathbackground']],
         ['mprescripts', []],
-        ['mroot', []],
-        ['mrow', []],
-        ['ms', []],
-        ['mspace', []],
-        ['msqrt', []],
-        ['mstyle', []],
-        ['msub', []],
-        ['msubsup', []],
-        ['msup', []],
-        ['mtable', []],
-        ['mtd', []],
-        ['mtext', []],
-        ['mtr', []],
-        ['munder', []],
-        ['munderover', []],
-        ['semantics', []]
+        ['mroot', ['mathbackground', 'mathcolor']],
+        ['mrow', ['dir', 'mathbackground', 'mathcolor']],
+        ['ms', ['lquote', 'rquote', 'mathvariant', 'mathsize', 'mathbackground', 'mathcolor']],
+        [
+          'mspace',
+          [
+            'linebreak',
+            'width',
+            'height',
+            'depth',
+            'mediummathspace',
+            'negativemediummathspace',
+            'negativethickmathspace',
+            'negativethinmathspace',
+            'negativeverythickmathspace',
+            'negativeverythinmathspace',
+            'thickmathspace',
+            'thinmathspace',
+            'verythickmathspace',
+            'verythinmathspace'
+          ]
+        ],
+        ['msqrt', ['mathbackground', 'mathcolor']],
+        [
+          'mstyle',
+          [
+            'scriptlevel',
+            'displaystyle',
+            'scriptsizemultiplier',
+            'scriptminsize',
+            'infixlinebreakstyle',
+            'decimalpoint',
+            'mathvariant',
+            'mathsize',
+            'mathbackground',
+            'mathcolor',
+            'dir'
+          ]
+        ],
+        ['msub', ['subscriptshift']],
+        ['msubsup', ['subscriptshift', 'superscriptshift']],
+        ['msup', ['superscriptshift']],
+        [
+          'mtable',
+          [
+            'align',
+            'rowalign',
+            'columnalign',
+            'groupalign',
+            'alignmentscope',
+            'columnwidth',
+            'width',
+            'rowspacing',
+            'columnspacing',
+            'rowlines',
+            'columnlines',
+            'frame',
+            'framespacing',
+            'equalrows',
+            'equalcolumns',
+            'displaystyle',
+            'side',
+            'minlabelspacing'
+          ]
+        ],
+        ['mtd', ['rowspan', 'columnspan', 'rowalign', 'columnalign', 'groupalign']],
+        ['mtext', ['mathvariant', 'mathsize', 'mathbackground', 'mathcolor']],
+        ['mtr', ['rowalign', 'columnalign', 'groupalign']],
+        ['munder', ['accentunder', 'align']],
+        ['munderover', ['accent', 'accentunder', 'align']],
+        ['semantics', ['definitionURL', 'encoding']]
       ] satisfies [string, string[]][]
     ).map(
       ([tag, attributes]) =>