Unsupported plotly.js features

This is a list of features that ggplot2 provides that Plotly doesn't have full (or any) support for.

ggplot2 feature	plotly workaround	plotly timeline
violin plots	box plots	NA
horizontal legend	basic legend	NA
irregularly spaced axes ticks	regular spaced ticks	NA
subplot titles	annotations	NA
legend titles	annotations	NA
unevenly spaced tick marks	NA	NA
legend markers by size	single legend item	NA
borders around legend symbols	NA	NA
multiple legends	NA	NA
gaps, or missing y data	don't plot the box	NA
hexagonal binning	rectangular binning	NA
density plots	histograms or line charts with computed values	NA
pointrange	error bars	NA