MathML not accepted as valid content for heading (h4) element #410
Description
Ace 1.3.2, Ace by DAISY app
The error was Minor, Best Practice, empty-heading with the text
- Element does not have text that is visible to screen readers
- aria-label attribute does not exist or is empty
- aria-labelledby attribute does not exist, references elements that do not exist or references elements that are empty
- Element has no title attribute
- Ensures headings have discernible text
- Headings should not be empty
The content of the heading (with additional context) was
<section class="level3" data-cfititle="Rate = k[A] superscript 2" epub:type="level3" id="rev_9781319369859_ch13sectlev3sect01">
<header id="pijaf13cbae91e8ea35ad1b541f0f663">
<h4 class="c-head title" epub:type="title" id="qago2378c123cf4da25e836845e9b1d8">
<span class="math" id="xper68cbdedf377ee0e4de6d4337af88" tabindex="0">
<math xmlns="http://www.w3.org/1998/Math/MathML" alttext="text Rate end text equals text italic k end text not stretchy left square bracket text A end text not stretchy right square bracket squared" display="inline" id="jphgcf738586b6209c9f961417b2fd63">
<semantics id="gjurdc99812fc14bab64e63242193f46">
<mrow id="yfkf0ee251bfa4da2c7bd866769f053c">
<mstyle id="mxoq80182f3e42bdc05302be6c5d3a19">
<mtext id="dxppf250498f426f7efcfbb84befea60">Rate </mtext>
<mo id="yjbcf7c22feff82037288ad2cc32c6bc">= </mo>
<mtext id="wspba9069b6bea20a7c63ee88c7adcec" mathvariant="italic">k </mtext>
<msup id="cxjaade89fe54f36513b87b6eb8be41f">
<mrow id="ehdc2d73ee5e303e7cb35fa9411024f5">
<mo id="qnhlc9a9497412179387946e0d9b6385" stretchy="false">[ </mo>
<mtext id="mlbr6468b7d5201461b8284b5987c4f0">A </mtext>
<mo id="kxrc0777fcdfeaa46e954ecf05704ae5" stretchy="false">] </mo>
</mrow>
<mn id="isfha59ad564151653d0ee82404b19b2">2 </mn>
</msup>
</mstyle>
</mrow>
<annotation-xml encoding="application/xhtml+xml" id="naxy4d6f367df4508f767c057d1bfd55" name="alternative-representation">
<img xmlns="http://www.w3.org/1999/xhtml" alt="text Rate end text equals text italic k end text not stretchy left square bracket text A end text not stretchy right square bracket squared" id="cyioff1e022e8f06035f24dd16aa6397" src="../images/jphgcf738586b6209c9f961417b2fd63.png"></img>
</annotation-xml>
</semantics>
</math>
</span>
</h4>
</header>
It appears that the MathML is being read as no text or as inaccessible text. This may be related to issue 398.
Thank you for any assistance that can be provided.