add clip, remove duplicate pointer

Author: Fil

docs/features/marks.md

@@ -593,7 +593,7 @@ A convenience method for composing a mark from a series of other marks. Returns
 
 ## Rendering
 
-To draw the visual representation of a mark, Plot calls its render function and inserts the returned SVG element (if any) in the chart. This function is called for each non-empty facet. It may also be called repeatedly by interactions, for example when the [pointer](./pointer) transform needs to draw the highlighted data point after a mouse move.
+To draw the visual representation of a mark, Plot calls its render function and inserts the returned SVG element (if any) in the chart. This function is called for each non-empty facet. It may also be called repeatedly by interactions, for example when the [pointer](./pointer.md) transform needs to draw the highlighted data point after a mouse move.
 
 :::warning
 This is a low-level interface. We recommend using higher-level options, such as [data transforms](https://observablehq.com/plot/features/transforms), when possible.
@@ -676,6 +676,7 @@ The *context* contains several useful globals:
 * document - the [document object](https://developer.mozilla.org/en-US/docs/Web/API/Document)
 * ownerSVGElement - the chart’s bare svg element
 * className - the [class name](./plots.md#other-options) of the chart (*e.g.*, "plot-d6a7b5")
+* clip - the top-level [clip](./features/plots.md#other-options) option (to use when the mark’s clip option is undefined)
 * projection - the [projection](./projections.md) stream, if any
 * dispatchValue - a function that sets the chart’s value and dispatches an input event if the value has changed; useful for interactive marks
 * getMarkState - a function that returns a mark’s state
@@ -727,7 +728,3 @@ Plot.dot(penguins, {
   }
 }).plot()
 ```
-
-:::info
-A similar technique is used by Plot’s [pointer](../interactions/pointer.md) transform to render the point closest to the pointer.
-:::