Pie: Accessibility Only
`accTitle` and a multi-line `accDescr { … }` with no `title`: they become the SVG's `<title>`/`<desc>` and are never drawn as text.
pie-accessibility-only.mmd
pie
accTitle: Survey answers
accDescr {
Most people answered yes.
A few said no.
}
"Yes" : 70
"No" : 30