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Backport for Math block and format #10307

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Backport for Math block and format #10307

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179 changes: 179 additions & 0 deletions src/wp-includes/kses.php
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Original file line number Diff line number Diff line change
Expand Up @@ -415,6 +415,185 @@
'wbr' => array(),
);

// https://www.w3.org/TR/mathml-core/#global-attributes
// Except common attributes added by _wp_add_global_attributes.
$math_global_attributes = array(
'displaystyle' => true,
'scriptlevel' => true,
'mathbackground' => true,
'mathcolor' => true,
'mathsize' => true,
// Common attributes also defined by _wp_add_global_attributes.
// We do not want to add all those global attributes though.
'class' => true,
'data-*' => true,
'dir' => true,
'id' => true,
'style' => true,
);

$math_overunder_attributes = array(
'accentunder' => true,
'accent' => true,
);

$allowedposttags = array_merge(
$allowedposttags,
array(
// https://www.w3.org/TR/mathml-core/#the-top-level-math-element
'math' => array_merge(
$math_global_attributes,
array(
'display' => true,
)
),

// https://www.w3.org/TR/mathml-core/#token-elements
// https://www.w3.org/TR/mathml-core/#text-mtext
'mtext' => $math_global_attributes,
// https://www.w3.org/TR/mathml-core/#the-mi-element
'mi' => array_merge(
$math_global_attributes,
array(
'mathvariant' => true,
)
),
// https://www.w3.org/TR/mathml-core/#number-mn
'mn' => $math_global_attributes,
// https://www.w3.org/TR/mathml-core/#operator-fence-separator-or-accent-mo
'mo' => array_merge(
$math_global_attributes,
array(
'form' => true,
'fence' => true,
'separator' => true,
'lspace' => true,
'rspace' => true,
'stretchy' => true,
'symmetric' => true,
'maxsize' => true,
'minsize' => true,
'largeop' => true,
'movablelimits' => true,
)
),
// https://www.w3.org/TR/mathml-core/#space-mspace
'mspace' => array_merge(
$math_global_attributes,
array(
'width' => true,
'height' => true,
'depth' => true,
)
),
// https://www.w3.org/TR/mathml-core/#string-literal-ms
'ms' => $math_global_attributes,

// https://www.w3.org/TR/mathml-core/#general-layout-schemata
// https://www.w3.org/TR/mathml-core/#horizontally-group-sub-expressions-mrow
'mrow' => $math_global_attributes,
// https://www.w3.org/TR/mathml-core/#fractions-mfrac
'mfrac' => array_merge(
$math_global_attributes,
array(
'linethickness' => true,
)
),
// https://www.w3.org/TR/mathml-core/#radicals-msqrt-mroot
'msqrt' => $math_global_attributes,
'mroot' => $math_global_attributes,
// https://www.w3.org/TR/mathml-core/#style-change-mstyle
'mstyle' => $math_global_attributes,
// https://www.w3.org/TR/mathml-core/#error-message-merror
'merror' => $math_global_attributes,
// https://www.w3.org/TR/mathml-core/#adjust-space-around-content-mpadded
'mpadded' => array_merge(
$math_global_attributes,
array(
'width' => true,
'height' => true,
'depth' => true,
'lspace' => true,
'voffset' => true,
)
),
// https://www.w3.org/TR/mathml-core/#making-sub-expressions-invisible-mphantom
'mphantom' => $math_global_attributes,

// https://www.w3.org/TR/mathml-core/#script-and-limit-schemata
// https://www.w3.org/TR/mathml-core/#subscripts-and-superscripts-msub-msup-msubsup
'msub' => $math_global_attributes,
'msup' => $math_global_attributes,
'msubsup' => $math_global_attributes,
// https://www.w3.org/TR/mathml-core/#underscripts-and-overscripts-munder-mover-munderover
'munder' => array_merge( $math_global_attributes, $math_overunder_attributes ),
'mover' => array_merge( $math_global_attributes, $math_overunder_attributes ),
'munderover' => array_merge( $math_global_attributes, $math_overunder_attributes ),
// https://www.w3.org/TR/mathml-core/#prescripts-and-tensor-indices-mmultiscripts
'mmultiscripts' => $math_global_attributes,
'mprescripts' => $math_global_attributes,

// https://www.w3.org/TR/mathml-core/#tabular-math
// https://www.w3.org/TR/mathml-core/#table-or-matrix-mtable
'mtable' => array_merge(
$math_global_attributes,
array(
// Non-standard, used by temml/katex.
// https://developer.mozilla.org/en-US/docs/Web/MathML/Reference/Element/mtable
'columnalign' => true,
'rowspacing' => true,
'columnspacing' => true,
'align' => true,
'rowalign' => true,
'columnlines' => true,
'rowlines' => true,
'frame' => true,
'framespacing' => true,
'width' => true,
)
),
// https://www.w3.org/TR/mathml-core/#row-in-table-or-matrix-mtr
'mtr' => array_merge(
$math_global_attributes,
array(
// Non-standard, used by temml/katex.
// https://developer.mozilla.org/en-US/docs/Web/MathML/Reference/Element/mtr
'columnalign' => true,
'rowalign' => true,
)
),
// https://www.w3.org/TR/mathml-core/#entry-in-table-or-matrix-mtd
'mtd' => array_merge(
$math_global_attributes,
array(
'columnspan' => true,
'rowspan' => true,
// Non-standard, used by temml/katex.
// https://developer.mozilla.org/en-US/docs/Web/MathML/Reference/Element/mtd
'columnalign' => true,
'rowalign' => true,
)
),

// https://www.w3.org/TR/mathml-core/#semantics-and-presentation
'semantics' => $math_global_attributes,
'annotation' => array_merge(
$math_global_attributes,
array(
'encoding' => true,
)
),

// Non-standard but widely supported, used by temml/katex.
'menclose' => array_merge(
$math_global_attributes,
array(
'notation' => true,
)
),
)
);

/**
* @var array[] $allowedtags Array of KSES allowed HTML elements.
* @since 1.0.0
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