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Improve the way mathematical formulas are exposed to screen readers. 

- Mark the png and svg fallback as aria-hidden="true".
- For browsers without good enough MathML visual rendering, 
  hide the <math> tag in a way that still makes it accessible to 
  screen readers.

Bug: 66537
Change-Id: I7ecf07a4da669d927e11265fd497a813786c6410
This commit is contained in:
Frédéric Wang 2014-10-04 20:48:42 +02:00 committed by Physikerwelt
parent ccd0819ffc
commit 9f6257c329
2 changed files with 20 additions and 5 deletions
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2
MathMathML.php
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@ -393,7 +393,7 @@ class MathMathML extends MathRenderer {
if ( $class ) { $attribs['class'] = $class; }
if ( $style ) { $attribs['style'] = $style; }
// an alternative for svg might be an object with type="image/svg+xml"
return Xml::element( 'img', $this->getAttributes( 'img', $attribs , array( 'src' => $url ) ) );
return Xml::element( 'img', $this->getAttributes( 'img', $attribs , array( 'src' => $url, 'aria-hidden' => 'true' ) ) );
}

23
modules/ext.math.css
View File

@ -8,8 +8,17 @@
@namespace m url('http://www.w3.org/1998/Math/MathML');
/* Default style for MathML. */
.mwe-math-mathml-inline { display: none; }
.mwe-math-mathml-display { display: none; margin-left: auto; margin-right: auto; }
.mwe-math-mathml-inline { display: inline !important; }
.mwe-math-mathml-display { display: block !important; margin-left: auto; margin-right: auto; }
.mwe-math-mathml-inline, .mwe-math-mathml-display {
/* We try to hide the MathML formula in a way that still makes it accessible to screen readers. */
clip: rect(1px, 1px, 1px, 1px);
overflow: hidden;
position: absolute;
width: 1px;
height: 1px;
opacity: 0;
}
m|math {
/* Try OpenType MATH fonts, the WOFF fallback and the old math fonts */
font-family: Cambria Math, Latin Modern Math, STIX Math, LatinModernMathWOFF, MathJax_Main, STIXGeneral, serif;
@ -48,8 +57,14 @@ img.mwe-math-fallback-png-display { display: block; }
@-moz-document url-prefix() {
/* For Gecko browsers, hide the SVG fallback and show the MathML instead.
We override the style for SVG and MathML above */
.mwe-math-mathml-inline { display: inline !important; }
.mwe-math-mathml-display { display: block !important; }
.mwe-math-mathml-inline, .mwe-math-mathml-display {
clip: auto;
overflow: visible;
position: static;
width: auto;
height: auto;
opacity: 1;
}
:root * > .mwe-math-mathml-inline + img.mwe-math-fallback-svg-inline,
:root * > .mwe-math-mathml-display + img.mwe-math-fallback-svg-display { display: none !important; }
}