2.1.457 Part 1 Section 19.15, chart:class
a. The standard defines the property "gantt", contained within the attribute chart:class
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This property is not supported in Excel 2013, Excel 2016, or Excel 2019.
b. The standard defines the property "minor", contained within the attribute chart:class
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This property is not supported in Excel 2013, Excel 2016, or Excel 2019.
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Excel saves the minor gridlines element on a category axis, but does not save it on a value axis.
c. The standard defines the property "stock", contained within the attribute chart:class
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This property is supported in Excel 2013, Excel 2016, and Excel 2019.
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Stock charts can have three (3) or more series.