Consider `<chart>` and/or `<diagram>` elements

[argyleink]

trafficstars

Can we define an element that can provide the information appropriately to screen readers, accept data via an attribute (since that would offer a very nice authoring experience), and be styled to match a brand/theme?

[argyleink]

Not trying to compete with D3, but in many cases developers don't care about implementation details, they just need to represent some data in a chart style (line, bar, etc). Would be interesting to see how far CSS can take most of the presentation while the component handles the accessibility.

[lukewarlow]

Potentially relevant https://github.com/whatwg/html/issues/9295

[github-actions[bot]]

There hasn't been any discussion on this issue for a while, so we're marking it as stale. If you choose to kick off the discussion again, we'll remove the 'stale' label.