/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/**************************************************************************/
/* namespace for MathML elements                                          */
/**************************************************************************/

@namespace url(http://www.w3.org/1998/Math/MathML);

* {
  writing-mode: horizontal-tb !important;
  font-size: math;
}

/**************************************************************************/
/* <math> - outermost math element                                        */
/**************************************************************************/

math {
  direction: ltr;
  unicode-bidi: embed;
  display: inline;
  font-size: inherit;
  font-style: normal;
  font-weight: normal;
  text-indent: 0;
  font-family: serif;
  line-height: normal;
  word-spacing: normal;
  letter-spacing: normal;
  text-rendering: optimizeLegibility;
  -moz-float-edge: margin-box;
  math-shift: normal;
  math-style: compact;
  math-depth: 0;
  /* stylelint-disable-next-line media-query-no-invalid */
  @media -moz-pref("mathml.font_family_math.enabled") {
    font-family: math;
  }
}
math[display="block" i] {
  display: block;
  text-align: -moz-center;
  math-style: normal;
}
math[display="inline" i] {
  display: inline;
  math-style: compact;
}

/**************************************************************************/
/* Links                                                                  */
/**************************************************************************/
:any-link {
  text-decoration: none !important;
}

/**************************************************************************/
/* attributes common to all tags                                          */
/**************************************************************************/

/* These attributes are mapped to style in MathMLElement.cpp:

   - background -> background                             (deprecated)
   - color -> color                                       (deprecated)
   - fontfamily -> font-family                            (deprecated)
   - fontsize -> font-size                                (deprecated)
   - fontstyle -> font-style                              (deprecated)
   - fontweight -> font-weight                            (deprecated)
   - mathvariant -> -moz-math-variant
   - scriptlevel -> math-depth
   - mathsize -> font-size
   - mathcolor -> color
   - mathbackground -> background

*/

/* Fractions */
mfrac {
  padding-inline: 1px;
}

/**************************************************************************/
/* merror                                                                 */
/**************************************************************************/

merror {
  border: 1px solid red;
  background-color: lightyellow;
}

/**************************************************************************/
/* mtable and its related tags                                            */
/**************************************************************************/

mtable {
  display: inline-table;
  border-collapse: separate;
  border-spacing: 0;
  text-indent: 0;
}
mtable[frame="none"] {
  border: none;
}
mtable[frame="solid"] {
  border: solid thin;
}
mtable[frame="dashed"] {
  border: dashed thin;
}

mtr,
mlabeledtr {
  display: table-row;
  vertical-align: baseline;
}

mtd {
  display: table-cell;
  vertical-align: inherit;
  text-align: -moz-center;
  white-space: nowrap;
}

/* Don't support m(labeled)tr without mtable, nor mtd without m(labeled)tr */
:not(mtable) > mtr,
:not(mtable) > mlabeledtr,
:not(mtr, mlabeledtr) > mtd {
  display: none !important;
}

/* Hide the label because mlabeledtr is not supported yet (bug 356870). This
   rule can be overriden by users. */
mlabeledtr > mtd:first-child {
  display: none;
}

/**********************************************************************/
/* rules to achieve the default spacing between cells. When rowspacing,
   columnspacing and framespacing aren't set on mtable.  The back-end code
   will set the internal attributes depending on the cell's position.
   When they are set, the spacing behaviour is handled outside of CSS */
mtd {
  padding-right: 0.4em; /* half of columnspacing[colindex] */
  padding-left: 0.4em; /* half of columnspacing[colindex-1] */
  padding-bottom: 0.5ex; /* half of rowspacing[rowindex] */
  padding-top: 0.5ex; /* half of rowspacing[rowindex-1] */
}
/* turn off the spacing at the periphery of boundary cells */
mtr:first-child > mtd {
  padding-top: 0;
}
mtr:last-child > mtd {
  padding-bottom: 0;
}
mtd:first-child {
  padding-inline-start: 0;
}
mtd:last-child {
  padding-inline-end: 0;
}
/* re-instate the spacing if the table has a surrounding frame */
mtable[frame="solid"] > mtr:first-child > mtd,
mtable[frame="dashed"] > mtr:first-child > mtd {
  padding-top: 0.5ex; /* framespacing.top */
}
mtable[frame="solid"] > mtr:last-child > mtd,
mtable[frame="dashed"] > mtr:last-child > mtd {
  padding-bottom: 0.5ex; /* framespacing.bottom */
}
mtable[frame="solid"] > mtr > mtd:first-child,
mtable[frame="dashed"] > mtr > mtd:first-child {
  padding-inline-start: 0.4em; /* framespacing.left (or right in rtl)*/
}
mtable[frame="solid"] > mtr > mtd:last-child,
mtable[frame="dashed"] > mtr > mtd:last-child {
  padding-inline-end: 0.4em; /* framespacing.right (or left in rtl)*/
}

mtable[rowspacing] > mtr > mtd,
mtable[columnspacing] > mtr > mtd,
mtable[framespacing] > mtr > mtd {
  /* Spacing handled outside of CSS */
  padding: 0;
}

/**********************************************************************/
/* This is used when wrapping non-MathML inline elements inside math. */
*|*::-moz-mathml-anonymous-block {
  display: inline-block !important;
  position: static !important;
  text-indent: 0;
}

/**************************************************************************/
/* Controlling Displaystyle and Scriptlevel                               */
/**************************************************************************/

/*
  http://www.w3.org/Math/draft-spec/chapter3.html#presm.scriptlevel

  The determination of math-style for <math> involves the displaystyle
  and display attributes. See the <math> section above.
*/

/*  munder, mover and munderover change the scriptlevels of their children
   using -moz-math-increment-script-level because regular CSS rules are
   insufficient to control when the scriptlevel should be incremented. All other
   cases can be described using regular CSS, so we do it this way because it's
   more efficient and less code. */
:-moz-math-increment-script-level {
  math-depth: add(1);
}

/*
   The mfrac element sets displaystyle to "false", or if it was already false
   increments scriptlevel by 1, within numerator and denominator.
*/
mfrac > * {
  math-depth: auto-add;
  math-style: compact;
}

/*
   The mroot element increments scriptlevel by 2, and sets displaystyle to
   "false", within index, but leaves both attributes unchanged within base.
   The msqrt element leaves both attributes unchanged within its argument.
*/
mroot > :not(:first-child) {
  math-depth: add(2);
  math-style: compact;
}

/*
   The msub element [...] increments scriptlevel by 1, and sets displaystyle to
   "false", within subscript, but leaves both attributes unchanged within base.

   The msup element [...] increments scriptlevel by 1, and sets displaystyle to
   "false", within superscript, but leaves both attributes unchanged within
   base.

   The msubsup element [...] increments scriptlevel by 1, and sets displaystyle
   to "false", within subscript and superscript, but leaves both attributes
   unchanged within base.

   The mmultiscripts element increments scriptlevel by 1, and sets displaystyle
   to "false", within each of its arguments except base, but leaves both
   attributes unchanged within base.
 */
msub > :not(:first-child),
msup > :not(:first-child),
msubsup > :not(:first-child),
mmultiscripts > :not(:first-child) {
  math-depth: add(1);
  math-style: compact;
}

/*
   The munder element [...] always sets displaystyle to "false" within the
   underscript, but increments scriptlevel by 1 only when accentunder is
   "false". Within base, it always leaves both attributes unchanged.

   The mover element [...] always sets displaystyle to "false" within
   overscript, but increments scriptlevel by 1 only when accent is "false".
   Within base, it always leaves both attributes unchanged.

   The munderover [..] always sets displaystyle to "false" within underscript
   and overscript, but increments scriptlevel by 1 only when accentunder or
   accent, respectively, are "false". Within base, it always leaves both
   attributes unchanged.
*/
munder > :not(:first-child),
mover > :not(:first-child),
munderover > :not(:first-child) {
  math-style: compact;
}

/*
   https://w3c.github.io/mathml-core/#user-agent-stylesheet

   A `math-shift: compact` value is applied to secondary elements like
   denominators, roots, subscripts and specific multi-script parts to render
   them at a reduced, "cramped" size.

   For certain sub-elements within `mmultiscripts`, `math-shift: inherit` is
   used to ensure they adopt the scaling of their parent.
*/
mfrac > :nth-child(2) {
  math-shift: compact;
}

mroot,
msqrt {
  math-shift: compact;
}

msub > :nth-child(2),
msubsup > :nth-child(2),
mmultiscripts > :nth-child(even),
mmultiscripts > mprescripts ~ :nth-child(odd),
mover[accent="true" i] > :first-child,
munderover[accent="true" i] > :first-child {
  math-shift: compact;
}

mmultiscripts > mprescripts ~ :nth-child(even) {
  math-shift: inherit;
}

/*
   The displaystyle attribute is allowed on the mtable element to set the
   inherited value of the attribute. If the attribute is not present, the
   mtable element sets displaystyle to "false" within the table elements.
*/
mtable {
  math-style: compact;
}

/*
   The mscarries element sets displaystyle to "false", and increments
   scriptlevel by 1, so the children are typically displayed in a smaller font.
   XXXfredw: This element is not implemented yet. See bug 534967.
mscarries {
  math-depth: add(1);
  math-style: compact;
}
*/

/* "The mphantom element renders invisibly, but with the same size and other
   dimensions, including baseline position, that its contents would have if
   they were rendered normally.".
   Also, we do not expose the <mphantom> element to the accessible tree
   (see bug 1108378). */
mphantom {
  visibility: hidden;
}

/* Implement MathML Core's semantics/maction support
   https://w3c.github.io/mathml-core/#dfn-semantics
   https://w3c.github.io/mathml-core/#dfn-maction */
maction > :not(:first-child),
semantics > :not(:first-child) {
  display: none;
}

/* stylelint-disable-next-line media-query-no-invalid */
@media -moz-pref("mathml.legacy_mathvariant_attribute.disabled") {
  /* Implement MathML Core's automatic italic on mi.
     https://w3c.github.io/mathml-core/#the-mathvariant-attribute */
  mi {
    text-transform: math-auto;
  }
}
