1. mathmlelement api: attributestylemap

2. mathmlelement api: style

3. mathmlelement api: style: returns `cssstyleproperties` (not `cssstyledeclaration`)

4. css property: math-style

5. css property: math-style: compact

6. css property: math-style: normal

7. elements: mstyle

8. elements: mstyle: background

9. elements: mstyle: color

10. elements: mstyle: fontsize

11. elements: mstyle: fontstyle

12. elements: mstyle: fontweight

13. global_attributes: displaystyle