The primary color of a marker is inherited from the *stroke* of the associated mark. The *arrow* marker is [automatically oriented](https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/orient) such that it points in the tangential direction of the path at the position the marker is placed. The *circle* markers are centered around the given vertex. Note that lines whose curve is not *linear* (the default), markers are not necessarily drawn at the data positions given by *x* and *y*; marker placement is determined by the (possibly Bézier) path segments generated by the curve. To ensure that symbols are drawn at a given *x* and *y* position, consider using a [dot](#dot).
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