Remove never-supported MathML features (#2691)

* Remove never-supported MathML element <mglyph> * Remove never-supported MathML <math> attribute overflow * Remove never-supported MathML element <mlabeledtr> * Remove never-supported MathML <mo> attributes form, largeop * Remove never-supported MathML <mspace> attribute linebreak * Remove never-supported MathML <mystyle> attribute decimalpoint * Remove never-supported MathML <mtable> attributes: alignmentscope, columnwidth, equalcolumns, equalrows, groupalign, minlabelspacing, side * Remove never-supported MathML <mtd> attribute groupalign mdn/browser-compat-data#6958 * Remove never-supported MathML <mtr> attribute groupalign mdn/browser-compat-data#6958 * Remove more <mglyph> mentions * Remove more <mlabeledtr> mentions * Remove more <math> attribute overflow mentions * Remove more <mo> attributes form and largeop mentions * Remove more <mspace> attribute linebreak mentions * Remove more <mstyle> attribute decimalpoint mentions * Remove more mentions of <mtable> attributes: alignmentscope columnwidth equalcolumns equalrows groupalign minlabelspacing side * Remove more <mtd> attribute groupalign mentions * Remove more <mtr> attribute groupalign mentions * Remove columnwidth dd left behind in 7b2b659
mdn · Mar 3, 2021 · 44112ad · 44112ad
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diff --git a/files/en-us/_wikihistory.json b/files/en-us/_wikihistory.json
@@ -157485,14 +157485,6 @@
       "jswisher"
     ]
   },
-  "Web/MathML/Element/mglyph": {
-    "modified": "2020-10-15T21:07:19.831Z",
-    "contributors": [
-      "lucian95",
-      "fscholz",
-      "Sheppy"
-    ]
-  },
   "Web/MathML/Element/mi": {
     "modified": "2020-12-08T06:58:12.774Z",
     "contributors": [
@@ -157504,14 +157496,6 @@
       "jswisher"
     ]
   },
-  "Web/MathML/Element/mlabeledtr": {
-    "modified": "2020-10-15T21:09:21.139Z",
-    "contributors": [
-      "lucian95",
-      "fscholz",
-      "Sheppy"
-    ]
-  },
   "Web/MathML/Element/mmultiscripts": {
     "modified": "2020-12-08T06:58:29.201Z",
     "contributors": [

diff --git a/files/en-us/mozilla/firefox/releases/9/index.html b/files/en-us/mozilla/firefox/releases/9/index.html
@@ -78,7 +78,7 @@ <h3 id="MathML">MathML</h3>
 
 <ul>
  <li>The non-standard <code>restyle</code> value for the <code>actiontype</code> attribute on {{ MathMLElement("maction") }} elements has been removed.</li>
- <li>While still unsupported, using the {{ MathMLElement("mlabeledtr") }} element no longer breaks rendering completely. See {{ bug(689641) }} for progress on actual support of this element.</li>
+ <li>While still unsupported, using the <code>mlabeledtr</code> element no longer breaks rendering completely. See {{ bug(689641) }} for progress on actual support of this element.</li>
 </ul>
 
 <h3 id="Networking">Networking</h3>

diff --git a/files/en-us/web/accessibility/understanding_wcag/text_labels_and_names/index.html b/files/en-us/web/accessibility/understanding_wcag/text_labels_and_names/index.html
@@ -188,10 +188,6 @@ <h3 id="Example_3">Example</h3>
 
 </pre>
 
-<h2 id="Use_alt_attribute_to_label_mglyph_elements">Use alt attribute to label mglyph  elements</h2>
-
-<p>When writing equations with MathML, give each {{mathmlelement("mglyph")}} element an <code>alt</code> attribute containing a name that describes the symbol. Since <code>mglyph</code> elements are used for non-standard symbols without Unicode definitions, screen readers won't automatically be able to name them. Alternative text helps users of screen readers understand the symbol.</p>
-
 <h2 id="Headings_must_be_labeled">Headings must be labeled</h2>
 
 <p>Make sure that your headings have non-empty text content, and are not hidden, such as with CSS <code>display:none</code> or <code>aria-hidden=true</code>. Users of screen readers rely on headings to understand the structure and content of a document.</p>

diff --git a/files/en-us/web/mathml/attribute/index.html b/files/en-us/web/mathml/attribute/index.html
@@ -49,11 +49,6 @@
     {{ MathMLElement("mstack") }}</td>
    <td>Specifies different alignments of several elements (see element pages for details).</td>
   </tr>
-  <tr id="alignmentscope">
-   <td>{{ unimplemented_inline() }} <code>alignmentscope</code></td>
-   <td>{{ MathMLElement("mtable") }}</td>
-   <td>A Boolean value specifying whether table columns should act as alignment scopes or not.</td>
-  </tr>
   <tr id="alt-*">
    <td>{{ unimplemented_inline() }}<br>
     <code>altimg</code><br>
@@ -81,7 +76,7 @@
   </tr>
   <tr id="columnalign">
    <td><code>columnalign</code></td>
-   <td>{{ MathMLElement("mtable") }}, {{ MathMLElement("mtd") }}, {{ MathMLElement("mtr") }}, {{ MathMLElement("mlabeledtr") }}</td>
+   <td>{{ MathMLElement("mtable") }}, {{ MathMLElement("mtd") }}, {{ MathMLElement("mtr") }}</td>
    <td>Specifies the horizontal alignment of table cells.</td>
   </tr>
   <tr id="columnlines">
@@ -99,21 +94,11 @@
    <td>{{ MathMLElement("mtd") }}</td>
    <td>A non-negative integer value that indicates over how many table columns the cell extends.</td>
   </tr>
-  <tr id="columnwidth">
-   <td>{{ unimplemented_inline() }} <code>columnwidth</code></td>
-   <td>{{ MathMLElement("mtable") }}</td>
-   <td>Specifies the width of table columns.</td>
-  </tr>
   <tr id="crossout">
    <td>{{ unimplemented_inline() }} <code>crossout</code></td>
    <td>{{ MathMLElement("mscarry") }}</td>
    <td>Specifies what kind of line is drawn to cross out carries.</td>
   </tr>
-  <tr id="decimalpoint">
-   <td>{{ unimplemented_inline() }} <code>decimalpoint</code></td>
-   <td>{{ MathMLElement("mstyle") }}</td>
-   <td>If the <code>decimalpoint</code> value is used to specify the <a href="#align">alignment</a>, this attribute is specifying the character for the alignment point within {{ MathMLElement("mstack") }} and {{ MathMLElement("mtable") }} columns.</td>
-  </tr>
   <tr id="denomalign">
    <td><code>denomalign</code> {{deprecated_inline}}</td>
    <td>{{ MathMLElement("mfrac") }}</td>
@@ -148,26 +133,11 @@
    <td>{{ MathMLElement("malignmark") }}</td>
    <td></td>
   </tr>
-  <tr id="equalcolumns">
-   <td>{{ unimplemented_inline() }} <code>equalcolumns</code></td>
-   <td>{{ MathMLElement("mtable") }}</td>
-   <td>A Boolean value indicating whether to force all columns to have the same total height.</td>
-  </tr>
-  <tr id="equalrows">
-   <td>{{ unimplemented_inline() }} <code>equalrows</code></td>
-   <td>{{ MathMLElement("mtable") }}</td>
-   <td>A Boolean value indicating whether to force all rows to have the same total height.</td>
-  </tr>
   <tr id="fence">
    <td><code>fence</code></td>
    <td>{{ MathMLElement("mo") }}</td>
    <td>A Boolean value specifying whether the operator is a fence (such as parentheses). There is no visual effect for this attribute.</td>
   </tr>
-  <tr id="form">
-   <td>{{ unimplemented_inline() }} <code>form</code></td>
-   <td>{{ MathMLElement("mo") }}</td>
-   <td>Specifies the role of the operator in an enclosed expression.</td>
-  </tr>
   <tr id="frame">
    <td><code>frame</code></td>
    <td>{{ MathMLElement("mtable") }}</td>
@@ -180,12 +150,12 @@
   </tr>
   <tr id="groupalign">
    <td>{{ unimplemented_inline() }} <code>groupalign</code></td>
-   <td>{{ MathMLElement("maligngroup") }}, {{ MathMLElement("mtable") }}, {{ MathMLElement("mtd") }}, {{ MathMLElement("mtr") }}</td>
+   <td>{{ MathMLElement("maligngroup") }}</td>
    <td></td>
   </tr>
   <tr id="height">
    <td><code>height</code></td>
-   <td>{{ MathMLElement("mglyph") }}, {{ MathMLElement("mpadded") }}, {{ MathMLElement("mspace") }}</td>
+   <td>{{ MathMLElement("mpadded") }}, {{ MathMLElement("mspace") }}</td>
    <td>Specifies the desired height. See <a href="/en-US/docs/MathML/Attributes/Values#Lengths">lengths</a> for possible values.</td>
   </tr>
   <tr id="href">
@@ -238,19 +208,14 @@
    <td>{{ MathMLElement("mstyle") }}</td>
    <td>Specifies the default <code>linebreakstyle</code> to use for infix operators.</td>
   </tr>
-  <tr id="largeop">
-   <td><code>largeop</code></td>
-   <td>{{ MathMLElement("mo") }}</td>
-   <td>Specifies whether the operator should be drawn larger than normal.</td>
-  </tr>
   <tr id="length">
    <td><code>length</code></td>
    <td>{{ MathMLElement("msline") }}</td>
    <td></td>
   </tr>
   <tr id="linebreak">
    <td>{{ unimplemented_inline() }} <code>linebreak</code></td>
-   <td>{{ MathMLElement("mo") }}, {{ MathMLElement("mspace") }}</td>
+   <td>{{ MathMLElement("mo") }}</td>
    <td></td>
   </tr>
   <tr id="linebreakmultchar">
@@ -318,11 +283,6 @@
    <td>{{ MathMLElement("mo") }}</td>
    <td>The maximum size of the operator.</td>
   </tr>
-  <tr id="minlabelspacing">
-   <td>{{ unimplemented_inline() }} <code>minlabelspacing</code></td>
-   <td>{{ MathMLElement("mtable") }}</td>
-   <td>A <a href="/en-US/docs/MathML/Attributes/Values">length value</a> specifying the minimum space between a <a href="Element/mlabeledtr" rel="internal">label</a> and the adjacent cell in the row.</td>
-  </tr>
   <tr id="minsize">
    <td><code>minsize</code></td>
    <td>{{ MathMLElement("mo") }}</td>
@@ -348,11 +308,6 @@
    <td>{{ MathMLElement("mfenced") }}</td>
    <td>A string for the opening delimiter.</td>
   </tr>
-  <tr id="overflow">
-   <td>{{ unimplemented_inline() }} <code>overflow</code></td>
-   <td>{{ MathMLElement("math") }}</td>
-   <td>If an expression is too long to fit in the allowed width, this attribute sets the preferred handling.</td>
-  </tr>
   <tr id="position">
    <td>{{ unimplemented_inline() }} <code>position</code></td>
    <td>{{ MathMLElement("msgroup") }}, {{ MathMLElement("msrow") }}, {{ MathMLElement("mscarries") }}, {{ MathMLElement("msline") }}</td>
@@ -423,16 +378,6 @@
    <td>{{ MathMLElement("msgroup") }}</td>
    <td></td>
   </tr>
-  <tr id="side">
-   <td>{{ unimplemented_inline() }} <code>side</code></td>
-   <td>{{ MathMLElement("mtable") }}</td>
-   <td>Specifies the position where {{ MathMLElement("mlabeledtr") }} label elements should be placed.</td>
-  </tr>
-  <tr id="src">
-   <td>{{ unimplemented_inline() }} <code>src</code></td>
-   <td>{{ MathMLElement("mglyph") }}</td>
-   <td>The location of the image resource.</td>
-  </tr>
   <tr id="stackalign">
    <td>{{ unimplemented_inline() }} <code>stackalign</code></td>
    <td>{{ MathMLElement("mstack") }}</td>
@@ -465,7 +410,7 @@
   </tr>
   <tr id="width">
    <td><code>width</code></td>
-   <td>{{ MathMLElement("mglyph") }}, {{ MathMLElement("mpadded") }}, {{ MathMLElement("mspace") }}, {{ MathMLElement("mtable") }}</td>
+   <td>{{ MathMLElement("mpadded") }}, {{ MathMLElement("mspace") }}, {{ MathMLElement("mtable") }}</td>
    <td>Specifies the desired width. See <a href="/en-US/docs/MathML/Attributes/Values#Lengths">lengths</a> for possible values.</td>
   </tr>
   <tr id="xlink-href">

diff --git a/files/en-us/web/mathml/element/index.html b/files/en-us/web/mathml/element/index.html
@@ -44,12 +44,6 @@ <h3 id="F">F</h3>
  <li>{{MathMLElement("mfrac")}} (Fraction)</li>
 </ul>
 
-<h3 id="G">G</h3>
-
-<ul>
- <li>{{MathMLElement("mglyph")}} (Displaying non-standard symbols)</li>
-</ul>
-
 <h3 id="I">I</h3>
 
 <ul>
@@ -59,7 +53,6 @@ <h3 id="I">I</h3>
 <h3 id="L">L</h3>
 
 <ul>
- <li>{{MathMLElement("mlabeledtr")}} (Labeled row in a table or a matrix)</li>
  <li>{{MathMLElement("mlongdiv")}} (Long division notation)</li>
 </ul>
 
@@ -150,7 +143,6 @@ <h3 id="Top-level_elements">Top-level elements</h3>
 <h3 id="Token_elements">Token elements</h3>
 
 <ul>
- <li>{{MathMLElement("mglyph")}}</li>
  <li>{{MathMLElement("mi")}}</li>
  <li>{{MathMLElement("mn")}}</li>
  <li>{{MathMLElement("mo")}}</li>
@@ -193,7 +185,6 @@ <h3 id="Tabular_math">Tabular math</h3>
 <ul>
  <li>{{MathMLElement("maligngroup")}}</li>
  <li>{{MathMLElement("malignmark")}}</li>
- <li>{{MathMLElement("mlabeledtr")}}</li>
  <li>{{MathMLElement("mtable")}}</li>
  <li>{{MathMLElement("mtd")}}</li>
  <li>{{MathMLElement("mtr")}}</li>

diff --git a/files/en-us/web/mathml/element/maction/index.html b/files/en-us/web/mathml/element/maction/index.html
@@ -29,7 +29,7 @@ <h2 id="Attributes">Attributes</h2>
 	<dt id="attr-class-id-style">class, id, style</dt>
 	<dd>Provided for use with <a href="/en-US/docs/CSS">stylesheets</a>.</dd>
 	<dt id="attr-displaystyle"><code>displaystyle</code></dt>
-	<dd>A Boolean value specifying whether more vertical space is used for displayed equations or, if set to <code>false</code>, a more compact layout is used to display formulas. The main effect is that larger versions of operators are displayed, when <code>displaystyle</code> is set to <code>true</code>. See also <code>largeop</code> and <code>movablelimits</code> on {{ MathMLElement("mo") }}.</dd>
+	<dd>A Boolean value specifying whether more vertical space is used for displayed equations or, if set to <code>false</code>, a more compact layout is used to display formulas. The main effect is that larger versions of operators are displayed, when <code>displaystyle</code> is set to <code>true</code>. See also <code>movablelimits</code> on {{ MathMLElement("mo") }}.</dd>
 	<dt id="attr-href">href</dt>
 	<dd>Used to set a hyperlink to a specified URI.</dd>
 	<dt id="attr-mathbackground">mathbackground</dt>

diff --git a/files/en-us/web/mathml/element/math/index.html b/files/en-us/web/mathml/element/math/index.html
@@ -37,9 +37,6 @@ <h2 id="Attributes">Attributes</h2>
 	<dt id="attr-mode">mode {{deprecated_inline}}</dt>
 	<dd>Deprecated in favor of the <a href="/en-US/docs/MathML/Element/math#attr-display">display attribute</a>.<br>
 	Possible values are: <code>display</code> (which has the same effect as <code>display="block"</code>) and <code>inline</code>.</dd>
-	<dt id="attr-overflow">overflow</dt>
-	<dd>Specifies how an expression behaves if it is too long to fit in the allowed width.<br>
-	Possible values are: <code>linebreak</code> (default), <code>scroll</code>, <code>elide</code>, <code>truncate</code>, <code>scale</code>.</dd>
 </dl>
 
 <h2 id="Examples">Examples</h2>

diff --git a/files/en-us/web/mathml/element/menclose/index.html b/files/en-us/web/mathml/element/menclose/index.html
@@ -17,7 +17,7 @@ <h2 id="Attributes">Attributes</h2>
  <dt id="attr-class-id-style">class, id, style</dt>
  <dd>Provided for use with <a href="/en-US/docs/CSS">stylesheets</a>.</dd>
  <dt id="attr-displaystyle"><code>displaystyle</code></dt>
- <dd>A Boolean value specifying whether more vertical space is used for displayed equations or, if set to <code>false</code>, a more compact layout is used to display formulas. The main effect is that larger versions of operators are displayed, when <code>displaystyle</code> is set to <code>true</code>. See also <code>largeop</code> and <code>movablelimits</code> on {{ MathMLElement("mo") }}.</dd>
+ <dd>A Boolean value specifying whether more vertical space is used for displayed equations or, if set to <code>false</code>, a more compact layout is used to display formulas. The main effect is that larger versions of operators are displayed, when <code>displaystyle</code> is set to <code>true</code>. See also <code>movablelimits</code> on {{ MathMLElement("mo") }}.</dd>
  <dt id="attr-href">href</dt>
  <dd>Used to set a hyperlink to a specified URI.</dd>
  <dt id="attr-mathbackground">mathbackground</dt>

diff --git a/files/en-us/web/mathml/element/merror/index.html b/files/en-us/web/mathml/element/merror/index.html
@@ -17,7 +17,7 @@ <h2 id="Attributes">Attributes</h2>
  <dt id="attr-class-id-style">class, id, style</dt>
  <dd>Provided for use with <a href="/en-US/docs/CSS">stylesheets</a>.</dd>
  <dt id="attr-displaystyle"><code>displaystyle</code></dt>
- <dd>A Boolean value specifying whether more vertical space is used for displayed equations or, if set to <code>false</code>, a more compact layout is used to display formulas. The main effect is that larger versions of operators are displayed, when <code>displaystyle</code> is set to <code>true</code>. See also <code>largeop</code> and <code>movablelimits</code> on {{ MathMLElement("mo") }}.</dd>
+ <dd>A Boolean value specifying whether more vertical space is used for displayed equations or, if set to <code>false</code>, a more compact layout is used to display formulas. The main effect is that larger versions of operators are displayed, when <code>displaystyle</code> is set to <code>true</code>. See also <code>movablelimits</code> on {{ MathMLElement("mo") }}.</dd>
  <dt id="attr-href">href</dt>
  <dd>Used to set a hyperlink to a specified URI.</dd>
  <dt id="attr-mathbackground">mathbackground</dt>

diff --git a/files/en-us/web/mathml/element/mfrac/index.html b/files/en-us/web/mathml/element/mfrac/index.html
@@ -27,7 +27,7 @@ <h2 id="Attributes">Attributes</h2>
  <dd>The alignment of the denominator under the fraction. Possible values are: <code>left</code>, <code>center</code> (default), and <code>right</code>.<br>
  This attribute is deprecated and will be removed in the future. Use CSS <code><a href="/en-US/docs/Web/CSS/text-align">text-align</a></code> instead.</dd>
  <dt id="attr-displaystyle"><code>displaystyle</code></dt>
- <dd>A Boolean value specifying whether more vertical space is used for displayed equations or, if set to <code>false</code>, a more compact layout is used to display formulas. The main effect is that larger versions of operators are displayed, when <code>displaystyle</code> is set to <code>true</code>. See also <code>largeop</code> and <code>movablelimits</code> on {{ MathMLElement("mo") }}.</dd>
+ <dd>A Boolean value specifying whether more vertical space is used for displayed equations or, if set to <code>false</code>, a more compact layout is used to display formulas. The main effect is that larger versions of operators are displayed, when <code>displaystyle</code> is set to <code>true</code>. See also <code>movablelimits</code> on {{ MathMLElement("mo") }}.</dd>
  <dt id="attr-href"><code>href</code></dt>
  <dd>Used to set a hyperlink to a specified URI.</dd>
  <dt id="attr-linethickness"><code>linethickness</code></dt>

diff --git a/files/en-us/web/mathml/element/mglyph/index.html b/files/en-us/web/mathml/element/mglyph/index.html
diff --git a/files/en-us/web/mathml/element/mi/index.html b/files/en-us/web/mathml/element/mi/index.html
@@ -19,7 +19,7 @@ <h2 id="Attributes">Attributes</h2>
  <dt id="attr-dir">dir</dt>
  <dd>The text direction. Possible values are either <code>ltr</code> (left to right) or <code>rtl</code> (right to left).</dd>
  <dt id="attr-displaystyle"><code>displaystyle</code></dt>
- <dd>A Boolean value specifying whether more vertical space is used for displayed equations or, if set to <code>false</code>, a more compact layout is used to display formulas. The main effect is that larger versions of operators are displayed, when <code>displaystyle</code> is set to <code>true</code>. See also <code>largeop</code> and <code>movablelimits</code> on {{ MathMLElement("mo") }}.</dd>
+ <dd>A Boolean value specifying whether more vertical space is used for displayed equations or, if set to <code>false</code>, a more compact layout is used to display formulas. The main effect is that larger versions of operators are displayed, when <code>displaystyle</code> is set to <code>true</code>. See also <code>movablelimits</code> on {{ MathMLElement("mo") }}.</dd>
  <dt id="attr-href">href</dt>
  <dd>Used to set a hyperlink to a specified URI.</dd>
  <dt id="attr-mathbackground">mathbackground</dt>