1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
|
// 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>");
}
}
};
|
