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// This is a helper for MathML feature detection.
// It is indented to be used to prevent false negative test results.
// This adds operator-specific feature detections.
Object.assign(MathMLFeatureDetection, {
"has_operator_lspace/rspace": async function() {
return this.has_operator_spacing();
},
"has_operator_movablelimits": async function() {
return this.has_movablelimits();
},
"has_operator_largeop": async function() {
if (!this.hasOwnProperty("_has_operator_largeop")) {
document.body.insertAdjacentHTML("beforeend", "\
<math style='font: 10px HasOperatorLargeopTestFont;'\
displaystyle='true'>\
<mo largeop='false' stretchy='false' symmetric='false'>⫿</mo>\
<mo largeop='true' stretchy='false' symmetric='false'>⫿</mo>\
</math>");
let font_face = new FontFace('HasOperatorLargeopTestFont',
'url(/fonts/math/largeop-displayoperatorminheight5000.woff)');
document.fonts.add(font_face);
await font_face.load();
var math = document.body.lastElementChild;
var mo = math.getElementsByTagName("mo");
this._has_operator_largeop =
(mo[1].getBoundingClientRect().height >
mo[0].getBoundingClientRect().height);
document.body.removeChild(math);
document.fonts.delete(font_face);
}
return this._has_operator_largeop;
},
"has_operator_stretchy": async function() {
if (!this.hasOwnProperty("_has_operator_stretchy")) {
document.body.insertAdjacentHTML("beforeend", "\
<math style='font: 10px HasOperatorStretchyTestFont;'>\
<mrow>\
<mo stretchy='false' largeop='false' symmetric='false'>⫿</mo>\
<mo stretchy='true' largeop='false' symmetric='false'>⫿</mo>\
<mspace style='background: black;' width='1px' height='2em'></mspace>\
</mrow>\
</math>");
let font_face = new FontFace('HasOperatorLargeopTestFont',
'url(/fonts/math/largeop-displayoperatorminheight5000.woff)');
document.fonts.add(font_face);
await font_face.load();
var math = document.body.lastElementChild;
var mo = math.getElementsByTagName("mo");
this._has_operator_stretchy =
(mo[1].getBoundingClientRect().height >
mo[0].getBoundingClientRect().height);
document.body.removeChild(math);
document.fonts.delete(font_face);
}
return this._has_operator_stretchy;
},
"has_operator_symmetric": async function() {
if (!this.hasOwnProperty("_has_operator_symmetric")) {
document.body.insertAdjacentHTML("beforeend", "\
<math style='font: 10px HasOperatorSymmetricTestFont;'>\
<mrow>\
<mo stretchy='true' largeop='false' symmetric='false'>⫿</mo>\
<mo stretchy='true' largeop='false' symmetric='true'>⫿</mo>\
<mspace style='background: black;' width='1px' height='2em'></mspace>\
</mrow>\
</math>");
let font_face = new FontFace('HasOperatorLargeopTestFont',
'url(/fonts/math/largeop-displayoperatorminheight5000.woff)');
document.fonts.add(font_face);
await font_face.load();
var math = document.body.lastElementChild;
var mo = math.getElementsByTagName("mo");
this._has_operator_symmetric =
(mo[1].getBoundingClientRect().height >
mo[0].getBoundingClientRect().height);
document.body.removeChild(math);
document.fonts.delete(font_face);
}
return this._has_operator_symmetric;
},
});
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