figure max-width: initial

[mbostock]

I’m not sure this is the “right” fix, but it feels like the safest and least invasive change to start. This way the figure max-width matches the SVG max-width. (It also roughly matches what we do with Inputs.table.)

Fixes #356.

[Fil]

why do you prefer 100% in this case rather than max-width: initial like in the Inputs? (both seem to work in Observable)

[mbostock]

I thought you might ask that… No particular reason, really. The initial value of max-width is none, so we could just set it to that, too. initial, none, and 100% should be equivalent if there isn’t an explicit width set on the figure element. I suppose using max-width: none or max-width: initial would be less opinionated than max-width: 100% if there is, though, so I can switch to that.