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Adding tentative HTML title and subtitle support (live example https://observablehq.com/d/90ecbc9920d7456e). A SVG approach would be better for chart portability (e.g. exporting to Illustrator) but it would mean implementing text wrapping and some lookups for text positioning that could be potentially troublesome.
For titles, we add a
h1
element, and for subtitles ah2
. We wrap everything in a figure tag, extending the support for captions.I wonder how minimal we want to go with the styling and which elements we'd want to use. A
h1
andh2
make sense for an isolated element but it might be too much for a chart that will be inside a document.Closes #92.