[docs][charts] Document line mark size customization - #23370
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Line marks have no size property on the series or the mark slot, so the size is set with CSS on lineClasses.mark: the r property for the default circle shape, and scale for the path-based shapes. Adds a playground demo that switches between shapes and shows the matching sx snippet.
JCQuintas
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type: enhancement
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JCQuintas
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Aug 18, 2026
JCQuintas
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Aug 18, 2026
Co-authored-by: Jose C Quintas Jr <juniorquintas@gmail.com> Signed-off-by: Jose C Quintas Jr <juniorquintas@gmail.com>
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Closes #20742.
The Lines page never explained how to resize the marks. Follow-up to the discussion in #20721, where the suggested
markElementClasses.rootselector does not work for the default'circle'shape.Verified against the source and in a browser test:
markerSizeonly exists on scatter series) and no usable one on themarkslot:CircleMarkElementhardcodesr={5}after the prop spread, andMarkElementbuilds itsdattribute from a fixed-size d3 symbol, soslotProps.markcannot change either.lineClasses.markdoes work:rfor the default'circle'shape, andscalefor thepath-based shapes, which keeps the mark centered on its data point.rhas no effect on paths, andscaleshifts circles off their data point, so the two are not interchangeable.Adds a
Mark sizesubsection to the CSS section, plus a playground demo that switches between shapes and prints the matchingsxsnippet.