// This is a helper for MathML feature detection.
// It is indented to be used to prevent false negative test results.
var MathMLFeatureDetection = {
"has_annotation": function() {
// FIXME: Improve feature detection.
return this.has_mspace();
},
"has_annotation-xml": function() {
// FIXME: Improve feature detection.
return this.has_mspace();
},
"has_maction": function() {
// FIXME: Improve feature detection.
return this.has_mspace();
},
"has_math": function() {
// FIXME: Improve feature detection.
return this.has_mspace();
},
"has_menclose": function() {
// Just check whether <mrow> is supported because discussion on this is
// still open ( https://github.com/mathml-refresh/mathml/issues/105 )
// and it would have to behave at least like an mrow, even if it becomes
// an unknown element at the end.
return this.has_mrow();
},
"has_merror": function() {
// FIXME: Improve feature detection.
return this.has_mspace();
},
"has_mfrac": function() {
if (!this.hasOwnProperty("_has_mfrac")) {
// Use tall enough fraction to avoid side effect of min num/denum shifts.
document.body.insertAdjacentHTML("beforeend", "<math>\
<mfrac>\
<mspace height='50px' depth='50px'></mspace>\
<mspace height='50px' depth='50px'></mspace>\
</mfrac>\
<mfrac>\
<mspace height='60px' depth='60px'></mspace>\
<mspace height='60px' depth='60px'></mspace>\
</mfrac>\
</math>");
var math = document.body.lastElementChild;
var mfrac = math.getElementsByTagName("mfrac");
// height/depth will add 40px per MathML, 20px if mfrac does not stack its children and none if mspace is not supported.
this._has_mfrac =
mfrac[1].getBoundingClientRect().height -
mfrac[0].getBoundingClientRect().height > 30;
document.body.removeChild(math);
}
return this._has_mfrac;
},
"has_mi": function() {
// FIXME: Improve feature detection.
return this.has_mspace();
},
"has_mmultiscripts": function() {
// FIXME: Improve feature detection.
return this.has_mspace();
},
"has_mn": function() {
// FIXME: Improve feature detection.
return this.has_mspace();
},
"has_mo": function() {
// FIXME: Improve feature detection.
return this.has_mspace();
},
"has_mover": function() {
// FIXME: Improve feature detection.
return this.has_munderover();
},
"has_mpadded": function() {
// FIXME: Improve feature detection.
return this.has_mspace();
},
"has_mphantom": function() {
// FIXME: Improve feature detection.
return this.has_mspace();
},
"has_mprescripts": function() {
// FIXME: Improve feature detection.
return this.has_mspace();
},
"has_mroot": function() {
// FIXME: Improve feature detection.
return this.has_msqrt();
},
"has_mrow": function() {
// FIXME: Improve feature detection.
return this.has_mspace();
},
"has_ms": function() {
// FIXME: Improve feature detection.
return this.has_mspace();
},
"has_mspace": function() {
// https://w3c.github.io/mathml-core/#space-mspace
if (!this.hasOwnProperty("_has_mspace")) {
document.body.insertAdjacentHTML("beforeend", "<math>\
<mspace></mspace>\
<mspace width='20px'></mspace>\
</math>");
var math = document.body.lastElementChild;
// The width attribute will add 20px per MathML and none if not supported.
this._has_mspace =
math.lastChild.getBoundingClientRect().width -
math.firstChild.getBoundingClientRect().width > 10;
document.body.removeChild(math);
}
return this._has_mspace;
},
"has_msqrt": function() {
if (!this.hasOwnProperty("_has_msqrt")) {
document.body.insertAdjacentHTML("beforeend", "<math>\
<mrow style='font-size: 20px !important'>\
<mtext>A</mtext>\
</mrow>\
<msqrt style='font-size: 20px !important'>\
<mtext>A</mtext>\
</msqrt>\
</math>");
var math = document.body.lastElementChild;
// The radical symbol will make msqrt wider than mrow, if the former is supported.
this._has_msqrt =
math.lastElementChild.getBoundingClientRect().width -
math.firstElementChild.getBoundingClientRect().width > 5;
document.body.removeChild(math);
}
return this._has_msqrt;
},
"has_mstyle": function() {
// FIXME: Improve feature detection.
return this.has_mspace();
},
"has_msub": function() {
// FIXME: Improve feature detection.
return this.has_mspace();
},
"has_msubsup": function() {
// FIXME: Improve feature detection.
return this.has_mspace();
},
"has_msup": function() {
// FIXME: Improve feature detection.
return this.has_mspace();
},
"has_mtable": function() {
// FIXME: Improve feature detection.
return this.has_mspace();
},
"has_mtd": function() {
// FIXME: Improve feature detection.
return this.has_mspace();
},
"has_mtext": function() {
// FIXME: Improve feature detection.
return this.has_mspace();
},
"has_mtr": function() {
// FIXME: Improve feature detection.
return this.has_mspace();
},
"has_munder": function() {
// FIXME: Improve feature detection.
return this.has_munderover();
},
"has_munderover": function() {
if (!this.hasOwnProperty("_has_munderover")) {
document.body.insertAdjacentHTML("beforeend", "<math>\
<munderover>\
<mspace width='20px'></mspace>\
<mspace width='20px'></mspace>\
<mspace width='20px'></mspace>\
</munderover>\
<munderover>\
<mspace width='40px'></mspace>\
<mspace width='40px'></mspace>\
<mspace width='40px'></mspace>\
</munderover>\
</math>");
var math = document.body.lastElementChild;
var munderover = math.getElementsByTagName("munderover");
// width_delta will be 20px per MathML, 3 * 20 = 60px if mundeover does not stack its children and 0px if mspace is not supported.
var width_delta =
munderover[1].getBoundingClientRect().width -
munderover[0].getBoundingClientRect().width;
this._has_munderover = width_delta > 10 && width_delta < 30;
document.body.removeChild(math);
}
return this._has_munderover;
},
"has_none": function() {
// FIXME: Improve feature detection.
return this.has_mspace();
},
"has_semantics": function() {
// FIXME: Improve feature detection.
return this.has_mspace();
},
"has_dir": function() {
if (!this.hasOwnProperty("_has_dir")) {
document.body.insertAdjacentHTML("beforeend", "<math style='direction: ltr !important;'>\
<mtext dir='rtl'></mtext>\
</math>");
var math = document.body.lastElementChild;
this._has_dir =
window.getComputedStyle(math.firstElementChild).
getPropertyValue('direction') === 'rtl';
document.body.removeChild(math);
}
return this._has_dir;
},
"has_mathsize": function() {
if (!this.hasOwnProperty("_has_mathsize")) {
document.body.insertAdjacentHTML("beforeend", "<math style='font-size: 64px !important;'>\
<mtext mathsize='32px'></mtext>\
</math>");
var math = document.body.lastElementChild;
this._has_mathsize =
window.getComputedStyle(math.firstElementChild).
getPropertyValue('font-size') === '32px';
document.body.removeChild(math);
}
return this._has_mathsize;
},
"has_movablelimits": function() {
if (!this.hasOwnProperty("_has_movablelimits")) {
document.body.insertAdjacentHTML("beforeend", "<math>\
<munder>\
<mo style='font-size: 30px !important' movablelimits='false'>A</mo>\
<mspace width='100px'></mspace>\
</munder>\
<munder>\
<mo style='font-size: 30px !important' movablelimits='true'>A</mo>\
<mspace width='100px'></mspace>\
</munder>\
</math>");
var math = document.body.lastElementChild;
var munder = math.getElementsByTagName("munder");
// If movablelimits is supported, the <mspace> will be placed next
// to <mo> rather than below it, so width_delta is about the width
// of the <mo>.
var width_delta =
munder[1].getBoundingClientRect().width -
munder[0].getBoundingClientRect().width;
this._has_movablelimits = this.has_munder() && width_delta > 20;
document.body.removeChild(math);
}
return this._has_movablelimits;
},
"has_operator_spacing": function() {
// https://w3c.github.io/mathml-core/#dfn-lspace
// https://w3c.github.io/mathml-core/#layout-of-mrow
if (!this.hasOwnProperty("_has_operator_spacing")) {
document.body.insertAdjacentHTML("beforeend", "<math>\
<mrow>\
<mn>1</mn><mo lspace='0px' rspace='0px'>+</mo><mn>2</mn>\
</mrow>\
<mrow>\
<mn>1</mn><mo lspace='20px' rspace='20px'>+</mo><mn>2</mn>\
</mrow>\
</math>");
var math = document.body.lastElementChild;
var mrow = math.getElementsByTagName("mrow");
// lspace/rspace will add 40px per MathML and none if not supported.
this._has_operator_spacing =
mrow[1].getBoundingClientRect().width -
mrow[0].getBoundingClientRect().width > 30;
document.body.removeChild(math);
}
return this._has_operator_spacing;
},
ensure_for_match_reftest: function(has_function) {
if (!document.querySelector("link[rel='match']"))
throw "This function must only be used for match reftest";
// Add a little red square at the top left corner if the feature is not supported in order to make match reftest fail.
if (!this[has_function]()) {
document.body.insertAdjacentHTML("beforeend", "\
<div style='width: 10px !important; height: 10px !important;\
position: absolute !important;\
left: 0 !important; top: 0 !important;\
background: red !important; z-index: 1000 !important;'></div>");
}
}
};
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