https://gitlab.wikimedia.org/repos/mediawiki/services/chart-renderer/-/tree/T393232-symbols?ref_type=heads

Here is an initial implementation (rendered at mobile size), with GDP of 3 countries from 1960-2024

With this many data points, the chart is a bit crowded and difficult to read.

Possible solutions:

• maybe make the symbols a little bit smaller
• add showSymbols as a chart definition option
• showSymbols if number of data points is below some threshold
• if number of series is small enough, we could show labels for each line
• showSymbols (or labels) could be a setting in the chart in the "action" toolbar (upper right corner of chart)
• we could have option to show the data as a table
• option to download data as csv
• hover tooltips can help for those with JavaScript enabbled and can do tooltips
• maybe other accessibility with aria-label, description etc.

Whatever we decide, we need to start with the most simple solution and then iterated as needed/desired.