What each field in the Properties pane means, shown when its label is hovered. PLAIN TEXT, not markdown. These are drawn by CSS from a `data-tooltip` attribute, which holds characters and nothing else - there is nowhere for a `` to go. Keep each to what the field does and, where there is one, the thing people get wrong. Keyed by the label the field displays, which is what makes a field acquire its explanation by being labelled: no call site passes anything, the same label reads the same way wherever it appears, and a label with no entry here renders with no tooltip rather than the wrong one. A label that is reworded loses its explanation, which is the safe direction to fail in.