- ms << "<" << from_ascii(ms.namespacedTag("mo")) << " form='prefix' fence='true' stretchy='true' symmetric='true' lspace='thinmathspace'>"
- << convertDelimToXMLEscape(left_, ms.xmlMode())
- << "</" << from_ascii(ms.namespacedTag("mo")) << ">"
+ // lspace='3/18em', but fractions are not allowed.
+ ms << MTagInline("mo", "form='prefix' fence='true' stretchy='true' symmetric='true' lspace='0.1666em'")
+ << convertDelimToXMLEscape(left_)
+ << ETagInline("mo")